diff --git a/.github/workflows/linux-clang.yml b/.github/workflows/linux-clang.yml
index 53a92e51..8475143e 100644
--- a/.github/workflows/linux-clang.yml
+++ b/.github/workflows/linux-clang.yml
@@ -14,20 +14,20 @@ on:
 
 env:
   CONCURRENT_BUILD:        4
-  CLANG_COMMAND:           clang-14
-  CLANGXX_COMMAND:         clang++-14
-  DOXYGEN_VER:             1.13.2
+  CLANG_COMMAND:           clang-18
+  CLANGXX_COMMAND:         clang++-18
+  DOXYGEN_VER:             1.16.1
   DOXYGEN_CACHE_REV:       0
-  BOOST_VER:               1_88_0
-  BOOST_VER_DOT:           1.88.0
+  BOOST_VER:               1_91_0
+  BOOST_VER_DOT:           1.91.0
   BOOST_BOOTSTRAP_TOOLSET: clang
-  BOOST_TOOLSET:           clang-14
+  BOOST_TOOLSET:           clang-18
   BOOST_CACHE_REV:         0
 
 jobs:
   doxygen_build:
     name:    Doxygen Build
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
     - name: Install dependencies
       shell: bash
@@ -42,7 +42,7 @@ jobs:
          fi
     
     - name: Cache Doxygen build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .doxygen_build
         key: Linux-Clang-Doxygen-${{ env.DOXYGEN_VER }}-${{ env.DOXYGEN_CACHE_REV }}
@@ -65,17 +65,17 @@ jobs:
   
   boost_build:
     name:    Boost Build
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
     - name: Install dependencies
       shell: bash
       run: |
         sudo apt-get -y update
         sudo apt-get -y install \
-          clang-14
+          clang-18
     
     - name: Cache Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build
         key: Linux-Clang-Boost-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -99,7 +99,7 @@ jobs:
   
   doxygen:
     name:    Doxygen
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs:   doxygen_build
     steps:
     - name: Install dependencies
@@ -108,19 +108,18 @@ jobs:
         sudo apt-get -y update
         sudo apt-get -y install \
           autoconf-archive \
-          clang-13 \
-          clang-14 \
+          clang-18 \
           dos2unix \
           graphviz \
           iwyu
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Doxygen build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .doxygen_build
         key: Linux-Clang-Doxygen-${{ env.DOXYGEN_VER }}-${{ env.DOXYGEN_CACHE_REV }}
@@ -144,7 +143,7 @@ jobs:
         ../configure $DISTCHECK_CONFIGURE_FLAGS
     
     - name: Cache documents
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .doxygen/doc
         key: Linux-Clang-documents-${{ github.run_number }}
@@ -157,7 +156,7 @@ jobs:
   
   lint:
     name:    Lint
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs:   boost_build
     steps:
     - name: Install dependencies
@@ -166,19 +165,18 @@ jobs:
         sudo apt-get -y update
         sudo apt-get -y install \
           autoconf-archive \
-          clang-13 \
-          clang-14 \
+          clang-18 \
           dos2unix \
           graphviz \
           iwyu
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build
         key: Linux-Clang-Boost-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -209,7 +207,7 @@ jobs:
   
   build:
     name:    Build
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs:   boost_build
     steps:
     - name: Install dependencies
@@ -218,19 +216,18 @@ jobs:
         sudo apt-get -y update
         sudo apt-get -y install \
           autoconf-archive \
-          clang-13 \
-          clang-14 \
+          clang-18 \
           dos2unix \
           graphviz \
           iwyu
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build
         key: Linux-Clang-Boost-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -254,7 +251,7 @@ jobs:
         ../configure $DISTCHECK_CONFIGURE_FLAGS
     
     - name: Cache archives
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .build/tetengo-*
         key: Linux-Clang-archives-${{ github.run_number }}
@@ -274,17 +271,17 @@ jobs:
     
   artifact:
     name:    Artifact Collection
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs:   [ doxygen, build ]
     steps:
     - name: Restore documents
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .doxygen/doc
         key: Linux-Clang-documents-${{ github.run_number }}
     
     - name: Restore archives
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .build/tetengo-*
         key: Linux-Clang-archives-${{ github.run_number }}
@@ -297,7 +294,7 @@ jobs:
         mv .build/tetengo-* artifacts
     
     - name: Upload artifacts
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v7
       with:
         name: artifacts-linux
         path: artifacts
diff --git a/.github/workflows/linux-gcc.yml b/.github/workflows/linux-gcc.yml
index 1268cb05..85ea2ad4 100644
--- a/.github/workflows/linux-gcc.yml
+++ b/.github/workflows/linux-gcc.yml
@@ -14,29 +14,29 @@ on:
 
 env:
   CONCURRENT_BUILD:        4
-  GCC_COMMAND:             gcc-12
-  GXX_COMMAND:             g++-12
-  BOOST_VER:               1_88_0
-  BOOST_VER_DOT:           1.88.0
+  GCC_COMMAND:             gcc-14
+  GXX_COMMAND:             g++-14
+  BOOST_VER:               1_91_0
+  BOOST_VER_DOT:           1.91.0
   BOOST_BOOTSTRAP_TOOLSET: gcc
-  BOOST_TOOLSET:           gcc-12
+  BOOST_TOOLSET:           gcc-14
   BOOST_CACHE_REV:         0
 
 jobs:
   boost_build:
     name:    Boost Build
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
     - name: Install dependencies
       shell: bash
       run: |
         sudo apt-get -y update
         sudo apt-get -y install \
-          gcc-12 \
-          g++-12
+          gcc-14 \
+          g++-14
     
     - name: Cache Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build
         key: Linux-GCC-Boost-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -60,7 +60,7 @@ jobs:
   
   build:
     name:    Build
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     needs:   boost_build
     steps:
     - name: Install dependencies
@@ -69,16 +69,16 @@ jobs:
         sudo apt-get -y update
         sudo apt-get -y install \
           autoconf-archive \
-          gcc-12 \
-          g++-12
+          gcc-14 \
+          g++-14
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build
         key: Linux-GCC-Boost-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
diff --git a/.github/workflows/windows-visualcpp.yml b/.github/workflows/windows-visualcpp.yml
index 6809cd9a..441771be 100644
--- a/.github/workflows/windows-visualcpp.yml
+++ b/.github/workflows/windows-visualcpp.yml
@@ -15,19 +15,20 @@ on:
 env:
   TETENGO_VER:              1.9.0
   CONCURRENT_BUILD:         4
-  BOOST_VER:                1_88_0
-  BOOST_VER_DOT:            1.88.0
-  BOOST_TOOLSET:            msvc-14.3
+  BOOST_VER:                1_91_0
+  BOOST_VER_DOT:            1.91.0
+  BOOST_TOOLSET:            msvc-14.5
   BOOST_CACHE_REV:          0
+  WIX_VER:                  7.0.0
   EMBEDTRANSFORM_CACHE_REV: 0
 
 jobs:
   boost_download:
     name:    Boost Download
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     steps:
     - name: Cache Boost source
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}.tar.gz
         key: Windows-VisualCpp-BoostSource-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -43,20 +44,20 @@ jobs:
   
   boost_build_for_release_win32:
     name:    Boost Buld for Release Win32
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   boost_download
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Restore Boost source
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}.tar.gz
         key: Windows-VisualCpp-BoostSource-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Cache Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-release-Win32-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -75,20 +76,20 @@ jobs:
   
   boost_build_for_debug_win32:
     name:    Boost Buld for Debug Win32
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   boost_download
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Restore Boost source
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}.tar.gz
         key: Windows-VisualCpp-BoostSource-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Cache Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-debug-Win32-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -107,20 +108,20 @@ jobs:
   
   boost_build_for_release_x64:
     name:    Boost Buld for Release x64
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   boost_download
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Restore Boost source
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}.tar.gz
         key: Windows-VisualCpp-BoostSource-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Cache Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-release-x64-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -139,20 +140,20 @@ jobs:
   
   boost_build_for_debug_x64:
     name:    Boost Buld for Debug x64
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   boost_download
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Restore Boost source
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}.tar.gz
         key: Windows-VisualCpp-BoostSource-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Cache Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-debug-x64-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
@@ -171,25 +172,25 @@ jobs:
   
   build_for_release_win32:
     name:    Build for Release Win32
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   boost_build_for_release_win32
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-release-Win32-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Cache product
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Release.Win32
         key: Windows-VisualCpp-product-release-Win32-${{ github.run_number }}
@@ -199,7 +200,7 @@ jobs:
       run: |
         set BOOST_INCLUDE=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}
         set BOOST_LIB_x86=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}\stage\Win32\lib
-        msbuild /t:Rebuild /m:1 /p:Configuration=Release;Platform=x86 tetengo.sln
+        msbuild /t:Rebuild /m:1 /p:Configuration=Release;Platform=x86 tetengo.slnx
         for /r %%f in (*.pch) do del /f /q %%f
         for /r %%f in (*.sbr) do del /f /q %%f
         for /r %%f in (*.bsc) do del /f /q %%f
@@ -209,25 +210,25 @@ jobs:
     
   build_for_debug_win32:
     name:    Build for Debug Win32
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   boost_build_for_debug_win32
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-debug-Win32-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Cache product
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Debug.Win32
         key: Windows-VisualCpp-product-debug-Win32-${{ github.run_number }}
@@ -237,7 +238,7 @@ jobs:
       run: |
         set BOOST_INCLUDE=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}
         set BOOST_LIB_x86=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}\stage\Win32\lib
-        msbuild /t:Rebuild /m:1 /p:Configuration=Debug;Platform=x86 tetengo.sln
+        msbuild /t:Rebuild /m:1 /p:Configuration=Debug;Platform=x86 tetengo.slnx
         for /r %%f in (*.pch) do del /f /q %%f
         for /r %%f in (*.sbr) do del /f /q %%f
         for /r %%f in (*.bsc) do del /f /q %%f
@@ -247,25 +248,25 @@ jobs:
     
   build_for_release_x64:
     name:    Build for Release x64
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   boost_build_for_release_x64
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-release-x64-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Cache product
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Release.x64
         key: Windows-VisualCpp-product-release-x64-${{ github.run_number }}
@@ -275,7 +276,7 @@ jobs:
       run: |
         set BOOST_INCLUDE=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}
         set BOOST_LIB_x64=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}\stage\x64\lib
-        msbuild /t:Rebuild /m:1 /p:Configuration=Release;Platform=x64 tetengo.sln
+        msbuild /t:Rebuild /m:1 /p:Configuration=Release;Platform=x64 tetengo.slnx
         for /r %%f in (*.pch) do del /f /q %%f
         for /r %%f in (*.sbr) do del /f /q %%f
         for /r %%f in (*.bsc) do del /f /q %%f
@@ -285,25 +286,25 @@ jobs:
     
   build_for_debug_x64:
     name:    Build for Debug x64
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   boost_build_for_debug_x64
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-debug-x64-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Cache product
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Debug.x64
         key: Windows-VisualCpp-product-debug-x64-${{ github.run_number }}
@@ -313,7 +314,7 @@ jobs:
       run: |
         set BOOST_INCLUDE=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}
         set BOOST_LIB_x64=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}\stage\x64\lib
-        msbuild /t:Rebuild /m:1 /p:Configuration=Debug;Platform=x64 tetengo.sln
+        msbuild /t:Rebuild /m:1 /p:Configuration=Debug;Platform=x64 tetengo.slnx
         for /r %%f in (*.pch) do del /f /q %%f
         for /r %%f in (*.sbr) do del /f /q %%f
         for /r %%f in (*.bsc) do del /f /q %%f
@@ -323,10 +324,10 @@ jobs:
     
   embedtransform_download:
     name:    EmbedTransform Download
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     steps:
     - name: Cache embedtransform
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .EmbedTransform
         key: Windows-VisualCpp-EmbedTransform-${{ env.EMBEDTRANSFORM_CACHE_REV }}
@@ -346,55 +347,56 @@ jobs:
   
   archive_for_win32:
     name:    Setup and Archive Build for Win32
-    runs-on: windows-2022
-    needs:   [ boost_build_for_release_Win32, embedtransform_download, build_for_release_Win32, build_for_debug_Win32, build_for_release_x64, build_for_debug_x64 ]
+    runs-on: windows-2025-vs2026
+    needs:   [ boost_build_for_release_win32, embedtransform_download, build_for_release_win32, build_for_debug_win32, build_for_release_x64, build_for_debug_x64 ]
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Install WiX
       shell: cmd
       run: |
-        dotnet tool install --global wix --version 6.0.0
-        wix extension add --global WixToolset.UI.wixext/6.0.0
+        dotnet tool install --global wix --version ${{ env.WIX_VER }}
+        wix eula accept wix7
+        wix extension add --global WixToolset.UI.wixext/${{ env.WIX_VER }}
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-release-Win32-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Restore embedtransform
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .EmbedTransform
         key: Windows-VisualCpp-EmbedTransform-${{ env.EMBEDTRANSFORM_CACHE_REV }}
     
     - name: Restore product for Release Win32
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Release.Win32
         key: Windows-VisualCpp-product-release-Win32-${{ github.run_number }}
     
     - name: Restore product for Debug Win32
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Debug.Win32
         key: Windows-VisualCpp-product-debug-Win32-${{ github.run_number }}
     
     - name: Restore product for Release x64
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Release.x64
         key: Windows-VisualCpp-product-release-x64-${{ github.run_number }}
     
     - name: Restore product for Debug x64
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Debug.x64
         key: Windows-VisualCpp-product-debug-x64-${{ github.run_number }}
@@ -405,10 +407,10 @@ jobs:
         set BOOST_INCLUDE=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}
         set BOOST_LIB_x86=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}\stage\Win32\lib
         set EMBEDTRANSFORMDIR=${{ github.workspace }}\.EmbedTransform\EmbedTransform\
-        msbuild /t:Rebuild /m:1 /p:Configuration=Release;Platform=x86 tetengo.setup.sln
+        msbuild /t:Rebuild /m:1 /p:Configuration=Release;Platform=x86 tetengo.setup.slnx
     
     - name: Cache archive
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin.setup\tetengo-windows-Win32-${{ env.TETENGO_VER }}.zip
         key: Windows-VisualCpp-archive-Win32-${{ github.run_number }}
@@ -420,55 +422,56 @@ jobs:
     
   archive_for_x64:
     name:    Setup and Archive Build for x64
-    runs-on: windows-2022
-    needs:   [ boost_build_for_release_x64, embedtransform_download, build_for_release_Win32, build_for_debug_Win32, build_for_release_x64, build_for_debug_x64 ]
+    runs-on: windows-2025-vs2026
+    needs:   [ boost_build_for_release_x64, embedtransform_download, build_for_release_win32, build_for_debug_win32, build_for_release_x64, build_for_debug_x64 ]
     steps:
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
     
     - name: Install WiX
       shell: cmd
       run: |
-        dotnet tool install --global wix --version 6.0.0
-        wix extension add --global WixToolset.UI.wixext/6.0.0
+        dotnet tool install --global wix --version ${{ env.WIX_VER }}
+        wix eula accept wix7
+        wix extension add --global WixToolset.UI.wixext/${{ env.WIX_VER }}
     
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
     
     - name: Restore Boost build
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .boost_build\boost_${{ env.BOOST_VER }}
         key: Windows-VisualCpp-Boost-release-x64-${{ env.BOOST_VER }}-${{ env.BOOST_CACHE_REV }}
     
     - name: Restore embedtransform
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .EmbedTransform
         key: Windows-VisualCpp-EmbedTransform-${{ env.EMBEDTRANSFORM_CACHE_REV }}
     
     - name: Restore product for Release Win32
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Release.Win32
         key: Windows-VisualCpp-product-release-Win32-${{ github.run_number }}
     
     - name: Restore product for Debug Win32
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Debug.Win32
         key: Windows-VisualCpp-product-debug-Win32-${{ github.run_number }}
     
     - name: Restore product for Release x64
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Release.x64
         key: Windows-VisualCpp-product-release-x64-${{ github.run_number }}
     
     - name: Restore product for Debug x64
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin\Debug.x64
         key: Windows-VisualCpp-product-debug-x64-${{ github.run_number }}
@@ -479,10 +482,10 @@ jobs:
         set BOOST_INCLUDE=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}
         set BOOST_LIB_x64=${{ github.workspace }}\.boost_build\boost_${{ env.BOOST_VER }}\stage\x64\lib
         set EMBEDTRANSFORMDIR=${{ github.workspace }}\.EmbedTransform\EmbedTransform\
-        msbuild /t:Rebuild /m:1 /p:Configuration=Release;Platform=x64 tetengo.setup.sln
+        msbuild /t:Rebuild /m:1 /p:Configuration=Release;Platform=x64 tetengo.setup.slnx
     
     - name: Cache archive
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           bin.setup\tetengo-windows-x64-${{ env.TETENGO_VER }}.zip
@@ -497,17 +500,17 @@ jobs:
     
   artifact:
     name:    Artifact Collection
-    runs-on: windows-2022
+    runs-on: windows-2025-vs2026
     needs:   [ archive_for_win32, archive_for_x64 ]
     steps:
     - name: Restore archive for Win32
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: bin.setup\tetengo-windows-Win32-${{ env.TETENGO_VER }}.zip
         key: Windows-VisualCpp-archive-Win32-${{ github.run_number }}
     
     - name: Restore archive for x64
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           bin.setup\tetengo-windows-x64-${{ env.TETENGO_VER }}.zip
@@ -523,7 +526,7 @@ jobs:
         move bin.libimage\tetengo-windows-libimage-x64-${{ env.TETENGO_VER }}.zip artifacts
     
     - name: Upload artifacts
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v7
       with:
         name: artifacts-windows
         path: artifacts
diff --git a/Doxyfile b/Doxyfile
index c74ee145..98fb21cf 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -1,4 +1,4 @@
-# Doxyfile 1.13.2
+# Doxyfile 1.16.1
 
 # This file describes the settings to be used by the documentation system
 # Doxygen (www.doxygen.org) for a project.
@@ -351,6 +351,20 @@ EXTENSION_MAPPING      =
 
 MARKDOWN_SUPPORT       = YES
 
+# If the MARKDOWN_STRICT tag is enabled then Doxygen treats text in comments as
+# Markdown formatted also in cases where Doxygen's native markup format
+# conflicts with that of Markdown. This is only relevant in cases where
+# backticks are used. Doxygen's native markup style allows a single quote to end
+# a text fragment started with a backtick and then treat it as a piece of quoted
+# text, whereas in Markdown such text fragment is treated as verbatim and only
+# ends when a second matching backtick is found. Also, Doxygen's native markup
+# format requires double quotes to be escaped when they appear in a backtick
+# section, whereas this is not needed for Markdown.
+# The default value is: YES.
+# This tag requires that the tag MARKDOWN_SUPPORT is set to YES.
+
+MARKDOWN_STRICT        = YES
+
 # When the TOC_INCLUDE_HEADINGS tag is set to a non-zero value, all headings up
 # to that level are automatically included in the table of contents, even if
 # they do not have an id attribute.
@@ -382,8 +396,8 @@ AUTOLINK_SUPPORT       = YES
 
 # This tag specifies a list of words that, when matching the start of a word in
 # the documentation, will suppress auto links generation, if it is enabled via
-# AUTOLINK_SUPPORT. This list does not affect affect links explicitly created
-# using \# or the \link or commands.
+# AUTOLINK_SUPPORT. This list does not affect links explicitly created using #
+# or the \link or \ref commands.
 # This tag requires that the tag AUTOLINK_SUPPORT is set to YES.
 
 AUTOLINK_IGNORE_WORDS  =
@@ -500,7 +514,7 @@ LOOKUP_CACHE_SIZE      = 0
 # which effectively disables parallel processing. Please report any issues you
 # encounter. Generating dot graphs in parallel is controlled by the
 # DOT_NUM_THREADS setting.
-# Minimum value: 0, maximum value: 32, default value: 1.
+# Minimum value: 0, maximum value: 512, default value: 1.
 
 NUM_PROC_THREADS       = 1
 
@@ -769,6 +783,27 @@ GENERATE_BUGLIST       = YES
 
 GENERATE_DEPRECATEDLIST= YES
 
+# The GENERATE_REQUIREMENTS tag can be used to enable (YES) or disable (NO) the
+# requirements page. When enabled, this page is automatically created when at
+# least one comment block with a \requirement command appears in the input.
+# The default value is: YES.
+
+GENERATE_REQUIREMENTS  = YES
+
+# The REQ_TRACEABILITY_INFO tag controls if traceability information is shown on
+# the requirements page (only relevant when using \requirement comment blocks).
+# The setting NO will disable the traceablility information altogether. The
+# setting UNSATISFIED_ONLY will show a list of requirements that are missing a
+# satisfies relation (through the command: \satisfies). Similarly the setting
+# UNVERIFIED_ONLY will show a list of requirements that are missing a verifies
+# relation (through the command: \verifies). Setting the tag to YES (the
+# default) will show both lists if applicable.
+# Possible values are: YES, NO, UNSATISFIED_ONLY and UNVERIFIED_ONLY.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_REQUIREMENTS is set to YES.
+
+REQ_TRACEABILITY_INFO  = YES
+
 # The ENABLED_SECTIONS tag can be used to enable conditional documentation
 # sections, marked by \if <section_label> ... \endif and \cond <section_label>
 # ... \endcond blocks.
@@ -1028,9 +1063,9 @@ INPUT_FILE_ENCODING    =
 #
 # If left blank the following patterns are tested:*.c, *.cc, *.cxx, *.cxxm,
 # *.cpp, *.cppm, *.ccm, *.c++, *.c++m, *.java, *.ii, *.ixx, *.ipp, *.i++, *.inl,
-# *.idl, *.ddl, *.odl, *.h, *.hh, *.hxx, *.hpp, *.h++, *.ixx, *.l, *.cs, *.d,
-# *.php, *.php4, *.php5, *.phtml, *.inc, *.m, *.markdown, *.md, *.mm, *.dox (to
-# be provided as Doxygen C comment), *.py, *.pyw, *.f90, *.f95, *.f03, *.f08,
+# *.idl, *.ddl, *.odl, *.h, *.hh, *.hxx, *.hpp, *.h++, *.l, *.cs, *.d, *.php,
+# *.php4, *.php5, *.phtml, *.inc, *.m, *.markdown, *.md, *.mm, *.dox (to be
+# provided as Doxygen C comment), *.py, *.pyw, *.f90, *.f95, *.f03, *.f08,
 # *.f18, *.f, *.for, *.vhd, *.vhdl, *.ucf, *.qsf and *.ice.
 
 FILE_PATTERNS          = *.c \
@@ -1743,7 +1778,7 @@ ECLIPSE_DOC_ID         = org.doxygen.Project
 # of each HTML page. A value of NO enables the index and the value YES disables
 # it. Since the tabs in the index contain the same information as the navigation
 # tree, you can set this option to YES if you also set GENERATE_TREEVIEW to YES.
-# The default value is: YES.
+# The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
 DISABLE_INDEX          = NO
@@ -1758,20 +1793,29 @@ DISABLE_INDEX          = NO
 # further fine tune the look of the index (see "Fine-tuning the output"). As an
 # example, the default style sheet generated by Doxygen has an example that
 # shows how to put an image at the root of the tree instead of the PROJECT_NAME.
-# Since the tree basically has the same information as the tab index, you could
-# consider setting DISABLE_INDEX to YES when enabling this option.
+# Since the tree basically has more details information than the tab index, you
+# could consider setting DISABLE_INDEX to YES when enabling this option.
 # The default value is: YES.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
 GENERATE_TREEVIEW      = YES
 
-# When both GENERATE_TREEVIEW and DISABLE_INDEX are set to YES, then the
-# FULL_SIDEBAR option determines if the side bar is limited to only the treeview
-# area (value NO) or if it should extend to the full height of the window (value
-# YES). Setting this to YES gives a layout similar to
-# https://docs.readthedocs.io with more room for contents, but less room for the
-# project logo, title, and description. If either GENERATE_TREEVIEW or
-# DISABLE_INDEX is set to NO, this option has no effect.
+# When GENERATE_TREEVIEW is set to YES, the PAGE_OUTLINE_PANEL option determines
+# if an additional navigation panel is shown at the right hand side of the
+# screen, displaying an outline of the contents of the main page, similar to
+# e.g. https://developer.android.com/reference If GENERATE_TREEVIEW is set to
+# NO, this option has no effect.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+PAGE_OUTLINE_PANEL     = YES
+
+# When GENERATE_TREEVIEW is set to YES, the FULL_SIDEBAR option determines if
+# the side bar is limited to only the treeview area (value NO) or if it should
+# extend to the full height of the window (value YES). Setting this to YES gives
+# a layout similar to e.g. https://docs.readthedocs.io with more room for
+# contents, but less room for the project logo, title, and description. If
+# GENERATE_TREEVIEW is set to NO, this option has no effect.
 # The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
@@ -1856,7 +1900,7 @@ USE_MATHJAX            = NO
 # regards to the different settings, so it is possible that also other MathJax
 # settings have to be changed when switching between the different MathJax
 # versions.
-# Possible values are: MathJax_2 and MathJax_3.
+# Possible values are: MathJax_2, MathJax_3 and MathJax_4.
 # The default value is: MathJax_2.
 # This tag requires that the tag USE_MATHJAX is set to YES.
 
@@ -1865,9 +1909,10 @@ MATHJAX_VERSION        = MathJax_2
 # When MathJax is enabled you can set the default output format to be used for
 # the MathJax output. For more details about the output format see MathJax
 # version 2 (see:
-# http://docs.mathjax.org/en/v2.7-latest/output.html) and MathJax version 3
+# https://docs.mathjax.org/en/v2.7/output.html), MathJax version 3 (see:
+# https://docs.mathjax.org/en/v3.2/output/index.html) and MathJax version 4
 # (see:
-# http://docs.mathjax.org/en/latest/web/components/output.html).
+# https://docs.mathjax.org/en/v4.0/output/index.htm).
 # Possible values are: HTML-CSS (which is slower, but has the best
 # compatibility. This is the name for Mathjax version 2, for MathJax version 3
 # this will be translated into chtml), NativeMML (i.e. MathML. Only supported
@@ -1880,36 +1925,50 @@ MATHJAX_VERSION        = MathJax_2
 MATHJAX_FORMAT         = HTML-CSS
 
 # When MathJax is enabled you need to specify the location relative to the HTML
-# output directory using the MATHJAX_RELPATH option. The destination directory
-# should contain the MathJax.js script. For instance, if the mathjax directory
-# is located at the same level as the HTML output directory, then
-# MATHJAX_RELPATH should be ../mathjax. The default value points to the MathJax
-# Content Delivery Network so you can quickly see the result without installing
-# MathJax. However, it is strongly recommended to install a local copy of
-# MathJax from https://www.mathjax.org before deployment. The default value is:
+# output directory using the MATHJAX_RELPATH option. For Mathjax version 2 the
+# destination directory should contain the MathJax.js script. For instance, if
+# the mathjax directory is located at the same level as the HTML output
+# directory, then MATHJAX_RELPATH should be ../mathjax.s For Mathjax versions 3
+# and 4 the destination directory should contain the tex-<format>.js script
+# (where <format> is either chtml or svg). The default value points to the
+# MathJax Content Delivery Network so you can quickly see the result without
+# installing MathJax. However, it is strongly recommended to install a local
+# copy of MathJax from https://www.mathjax.org before deployment. The default
+# value is:
 # - in case of MathJax version 2: https://cdn.jsdelivr.net/npm/mathjax@2
 # - in case of MathJax version 3: https://cdn.jsdelivr.net/npm/mathjax@3
+# - in case of MathJax version 4: https://cdn.jsdelivr.net/npm/mathjax@4
 # This tag requires that the tag USE_MATHJAX is set to YES.
 
 MATHJAX_RELPATH        = https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/
 
 # The MATHJAX_EXTENSIONS tag can be used to specify one or more MathJax
 # extension names that should be enabled during MathJax rendering. For example
-# for MathJax version 2 (see
-# https://docs.mathjax.org/en/v2.7-latest/tex.html#tex-and-latex-extensions):
+# for MathJax version 2 (see https://docs.mathjax.org/en/v2.7/tex.html):
 # MATHJAX_EXTENSIONS = TeX/AMSmath TeX/AMSsymbols
 # For example for MathJax version 3 (see
-# http://docs.mathjax.org/en/latest/input/tex/extensions/index.html):
+# https://docs.mathjax.org/en/v3.2/input/tex/extensions/):
 # MATHJAX_EXTENSIONS = ams
+# For example for MathJax version 4 (see
+# https://docs.mathjax.org/en/v4.0/input/tex/extensions/):
+# MATHJAX_EXTENSIONS = units
+# Note that for Mathjax version 4 quite a few extensions are already
+# automatically loaded. To disable a package in Mathjax version 4 one can use
+# the package name prepended with a minus sign (- like MATHJAX_EXTENSIONS +=
+# -textmacros)
 # This tag requires that the tag USE_MATHJAX is set to YES.
 
 MATHJAX_EXTENSIONS     =
 
 # The MATHJAX_CODEFILE tag can be used to specify a file with JavaScript pieces
-# of code that will be used on startup of the MathJax code. See the MathJax site
-# (see:
-# http://docs.mathjax.org/en/v2.7-latest/output.html) for more details. For an
-# example see the documentation.
+# of code that will be used on startup of the MathJax code. See the Mathjax site
+# for more details:
+# - MathJax version 2 (see:
+# https://docs.mathjax.org/en/v2.7/)
+# - MathJax version 3 (see:
+# https://docs.mathjax.org/en/v3.2/)
+# - MathJax version 4 (see:
+# https://docs.mathjax.org/en/v4.0/) For an example see the documentation.
 # This tag requires that the tag USE_MATHJAX is set to YES.
 
 MATHJAX_CODEFILE       =
@@ -2570,7 +2629,7 @@ HAVE_DOT               = YES
 # processors available in the system. You can set it explicitly to a value
 # larger than 0 to get control over the balance between CPU load and processing
 # speed.
-# Minimum value: 0, maximum value: 32, default value: 0.
+# Minimum value: 0, maximum value: 512, default value: 0.
 # This tag requires that the tag HAVE_DOT is set to YES.
 
 DOT_NUM_THREADS        = 0
@@ -2672,6 +2731,15 @@ UML_LOOK               = NO
 
 UML_LIMIT_NUM_FIELDS   = 10
 
+# If the UML_LOOK tag is enabled, field labels are shown along the edge between
+# two class nodes. If there are many fields and many nodes the graph may become
+# too cluttered. The UML_MAX_EDGE_LABELS threshold limits the number of items to
+# make the size more manageable. Set this to 0 for no limit.
+# Minimum value: 0, maximum value: 100, default value: 10.
+# This tag requires that the tag UML_LOOK is set to YES.
+
+UML_MAX_EDGE_LABELS    = 10
+
 # If the DOT_UML_DETAILS tag is set to NO, Doxygen will show attributes and
 # methods without types and arguments in the UML graphs. If the DOT_UML_DETAILS
 # tag is set to YES, Doxygen will add type and arguments for attributes and
diff --git a/Makefile.am b/Makefile.am
index b1230457..314089c4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -27,8 +27,8 @@ EXTRA_DIST = \
     ${data_files} \
     bootstrap.sh \
     Doxyfile \
-    tetengo.sln \
-    tetengo.setup.sln
+    tetengo.slnx \
+    tetengo.setup.slnx
 
 
 nobase_pkgdata_DATA = \
diff --git a/README.md b/README.md
index 7ca0d3b4..1552d303 100644
--- a/README.md
+++ b/README.md
@@ -81,13 +81,12 @@ How to Build and Install
 
 #### Requirements
 
-- [Visual Studio 2022](https://visualstudio.microsoft.com/)
-- [Boost C++ libraries 1.88.0](https://www.boost.org/)
-- [Doxygen 1.13.2](https://www.doxygen.nl/)
+- [Visual Studio 2026](https://visualstudio.microsoft.com/)
+- [Boost C++ libraries 1.91.0](https://www.boost.org/)
+- [Doxygen 1.16.1](https://www.doxygen.nl/)
 - [Graphviz](https://www.graphviz.org/)
-- [WiX toolset 6.0.0](https://wixtoolset.org/)
-- [Python 3.9](https://www.python.org/) or
-  [Python 3.10](https://www.python.org/)
+- [WiX toolset 7.0.0](https://wixtoolset.org/)
+- [Python 3.12](https://www.python.org/)
 - [mypy](http://www.mypy-lang.org/)
 - [Black](https://black.readthedocs.io/en/stable/)
 - [isort](https://pycqa.github.io/isort/)
@@ -112,13 +111,13 @@ Clone the source files from GitHub:
 > git clone --recurse-submodules https://github.com/tetengo/tetengo.cpp.git
 ```
 
-Open the file `tetengo.sln` in the work tree.
+Open the file `tetengo.slnx` in the work tree.
 
 Execute the menu command [Build]-[Build Solution] in Visual Studio.
 
 #### Building setup
 
-Open the file `tetengo.setup.sln` in the work tree, and execute the menu
+Open the file `tetengo.setup.slnx` in the work tree, and execute the menu
 command [Build]-[Build Solution] in Visual Studio.
 
 `setup.exe` and `tetengo.msi` will be created under the `bin.setup` folder in
@@ -138,19 +137,15 @@ Doxygen will output the documents into the directory `doc`.
 
 #### Requirements
 
-- [Clang 11](https://clang.llvm.org/),
-  [Clang 14](https://clang.llvm.org/),
-  [GCC 10](https://gcc.gnu.org/) or
-  [GCC 12](https://gcc.gnu.org/)
-- [Boost C++ libraries 1.88.0](https://www.boost.org/)
-- [Doxygen 1.13.2](https://www.doxygen.nl/)
+- [Clang 18](https://clang.llvm.org/) or
+  [GCC 14](https://gcc.gnu.org/)
+- [Boost C++ libraries 1.91.0](https://www.boost.org/)
+- [Doxygen 1.16.1](https://www.doxygen.nl/)
 - [Graphviz](https://www.graphviz.org/)
-- [include-what-you-use 0.15](https://include-what-you-use.org/) or
-  [include-what-you-use 0.17](https://include-what-you-use.org/)
-- [Clang Format 11](https://clang.llvm.org/docs/ClangFormat.html)
+- [include-what-you-use](https://include-what-you-use.org/)
+- [Clang Format](https://clang.llvm.org/docs/ClangFormat.html)
 - [Dos2Unix](https://waterlan.home.xs4all.nl/dos2unix.html)
-- [Python 3.9](https://www.python.org/) or
-  [Python 3.10](https://www.python.org/)
+- [Python 3.12](https://www.python.org/)
 - [mypy](http://www.mypy-lang.org/)
 - [Black](https://black.readthedocs.io/en/stable/)
 - [isort](https://pycqa.github.io/isort/)
diff --git a/configure.ac b/configure.ac
index 8fe02c7a..3aec7b18 100644
--- a/configure.ac
+++ b/configure.ac
@@ -184,18 +184,22 @@ test -z $DOXYGEN && \
 
 #### Library Checks ####
 AX_PTHREAD
+AX_PTHREAD_LINK_CFLAGS="${PTHREAD_CFLAGS}"
+AS_IF(
+    [${CXX} --version 2>/dev/null | grep -qi clang],
+    [test "x${PTHREAD_CFLAGS}" = "x-pthread" && AX_PTHREAD_LINK_CFLAGS=""]
+)
+LDFLAGS="${AX_PTHREAD_LINK_CFLAGS} ${LDFLAGS}"
 AC_SUBST([LIBS], "${PTHREAD_LIBS} ${LIBS}")
-AC_SUBST([CFLAGS], "${CFLAGS} ${PTHREAD_CFLAGS}")
-AC_SUBST([CXXFLAGS], "${CXXFLAGS} ${PTHREAD_CFLAGS}")
 AC_SUBST([CC], "${PTHREAD_CC}")
 
-AX_BOOST_BASE([1.88.0])
+AX_BOOST_BASE([1.91.0])
 AX_BOOST_UNIT_TEST_FRAMEWORK
 AC_SUBST([LDFLAGS], "${LDFLAGS} ${BOOST_LDFLAGS}")
 AC_SUBST([LIBS], "-lstdc++fs -lstdc++ ${LIBS}")
 
 #### Header Checks ####
-AC_SUBST([CPPFLAGS], "${CPPFLAGS} ${BOOST_CPPFLAGS}")
+AC_SUBST([CPPFLAGS], "${CPPFLAGS} ${PTHREAD_CFLAGS} ${BOOST_CPPFLAGS}")
 
 #### Compilation Options ####
 AC_SUBST([CXXFLAGS_IWYU], "${CXXFLAGS} -std=c++20 -Werror -Wall -Wextra -pedantic-errors")
diff --git a/executable/setup/setup.vcxproj b/executable/setup/setup.vcxproj
index 1a5cab49..5ac3f36d 100644
--- a/executable/setup/setup.vcxproj
+++ b/executable/setup/setup.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/kogyan b/kogyan
index 1b9e63d0..29f0fe8c 160000
--- a/kogyan
+++ b/kogyan
@@ -1 +1 @@
-Subproject commit 1b9e63d0d05d3372df9f297d218fad1bfbd4b0fb
+Subproject commit 29f0fe8c1f6ffc50a312d664983304e39cb4bef0
diff --git a/library/json/c/include/tetengo/json/element.h b/library/json/c/include/tetengo/json/element.h
index ddbb1510..069b135e 100644
--- a/library/json/c/include/tetengo/json/element.h
+++ b/library/json/c/include/tetengo/json/element.h
@@ -24,70 +24,70 @@ typedef struct tetengo_json_element_tag tetengo_json_element_t;
 
     \return The type name.
 */
-int tetengo_json_element_typeName_string();
+int tetengo_json_element_typeName_string(void);
 
 /*!
     \brief Returns the type name of number.
 
     \return The type name.
 */
-int tetengo_json_element_typeName_number();
+int tetengo_json_element_typeName_number(void);
 
 /*!
     \brief Returns the type name of boolean.
 
     \return The type name.
 */
-int tetengo_json_element_typeName_boolean();
+int tetengo_json_element_typeName_boolean(void);
 
 /*!
     \brief Returns the type name of null.
 
     \return The type name.
 */
-int tetengo_json_element_typeName_null();
+int tetengo_json_element_typeName_null(void);
 
 /*!
     \brief Returns the type name of object.
 
     \return The type name.
 */
-int tetengo_json_element_typeName_object();
+int tetengo_json_element_typeName_object(void);
 
 /*!
     \brief Returns the type name of member.
 
     \return The type name.
 */
-int tetengo_json_element_typeName_member();
+int tetengo_json_element_typeName_member(void);
 
 /*!
     \brief Returns the type name of array.
 
     \return The type name.
 */
-int tetengo_json_element_typeName_array();
+int tetengo_json_element_typeName_array(void);
 
 /*!
     \brief Returns the type category of primitive.
 
     \return The type category.
 */
-int tetengo_json_element_typeCategory_primitive();
+int tetengo_json_element_typeCategory_primitive(void);
 
 /*!
     \brief Returns the type category of opening structure.
 
     \return The type category.
 */
-int tetengo_json_element_typeCategory_structureOpen();
+int tetengo_json_element_typeCategory_structureOpen(void);
 
 /*!
     \brief Returns the type category of closing structure.
 
     \return The type category.
 */
-int tetengo_json_element_typeCategory_structureClose();
+int tetengo_json_element_typeCategory_structureClose(void);
 
 /*! The type type. */
 typedef struct tetengo_json_element_type_tag
diff --git a/library/json/c/include/tetengo/json/reader.h b/library/json/c/include/tetengo/json/reader.h
index 18223000..66134703 100644
--- a/library/json/c/include/tetengo/json/reader.h
+++ b/library/json/c/include/tetengo/json/reader.h
@@ -45,7 +45,7 @@ typedef struct tetengo_json_location_tag
 
     \return The default buffer capacity.
 */
-size_t tetengo_json_reader_streamReaderDefaultBufferCapacity();
+size_t tetengo_json_reader_streamReaderDefaultBufferCapacity(void);
 
 /*!
     \brief Creates a stream reader.
diff --git a/library/json/c/src/tetengo_json_reader.cpp b/library/json/c/src/tetengo_json_reader.cpp
index 4f4f7d5f..f1692505 100644
--- a/library/json/c/src/tetengo_json_reader.cpp
+++ b/library/json/c/src/tetengo_json_reader.cpp
@@ -8,7 +8,7 @@
 #include <iterator>
 #include <memory>
 #include <stdexcept>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <string_view>
 #include <utility>
 
diff --git a/library/json/c/tetengo.json.vcxproj b/library/json/c/tetengo.json.vcxproj
index 5ce60344..6c394be3 100644
--- a/library/json/c/tetengo.json.vcxproj
+++ b/library/json/c/tetengo.json.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/json/cpp/src/tetengo.json.channel.cpp b/library/json/cpp/src/tetengo.json.channel.cpp
index 991466fc..ccccf863 100644
--- a/library/json/cpp/src/tetengo.json.channel.cpp
+++ b/library/json/cpp/src/tetengo.json.channel.cpp
@@ -16,7 +16,6 @@
 #include <stdexcept>
 #include <utility>
 #include <variant>
-#include <vector>
 
 #include <boost/core/noncopyable.hpp>
 
diff --git a/library/json/cpp/src/tetengo.json.json_parser.cpp b/library/json/cpp/src/tetengo.json.json_parser.cpp
index b4bf8885..3ed9ce73 100644
--- a/library/json/cpp/src/tetengo.json.json_parser.cpp
+++ b/library/json/cpp/src/tetengo.json.json_parser.cpp
@@ -28,6 +28,8 @@
 #include <tetengo/json/line_counting_reader.hpp>
 #include <tetengo/json/reader.hpp>
 
+#include "tetengo/json/file_location.hpp" // IWYU pragma: keep
+
 
 namespace tetengo::json
 {
diff --git a/library/json/cpp/tetengo.json.cpp.vcxproj b/library/json/cpp/tetengo.json.cpp.vcxproj
index 2ea9f34f..c68fa43d 100644
--- a/library/json/cpp/tetengo.json.cpp.vcxproj
+++ b/library/json/cpp/tetengo.json.cpp.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/json/test/src/usage_tetengo.json.parsing_c.c b/library/json/test/src/usage_tetengo.json.parsing_c.c
index dc25fd47..0c7df1f8 100644
--- a/library/json/test/src/usage_tetengo.json.parsing_c.c
+++ b/library/json/test/src/usage_tetengo.json.parsing_c.c
@@ -20,7 +20,7 @@
 int         make_json_file(const char* text, const char* path);
 const char* to_string(const tetengo_json_element_t* p_element);
 
-void usage_tetengo_json_parsing()
+void usage_tetengo_json_parsing(void)
 {
     // clang-format off
     static const char* const json_text =
diff --git a/library/json/test/src/usage_tetengo.json.parsing_c.h b/library/json/test/src/usage_tetengo.json.parsing_c.h
index a10ecba7..049135e3 100644
--- a/library/json/test/src/usage_tetengo.json.parsing_c.h
+++ b/library/json/test/src/usage_tetengo.json.parsing_c.h
@@ -13,7 +13,7 @@
 extern "C" {
 #endif
 
-void usage_tetengo_json_parsing();
+void usage_tetengo_json_parsing(void);
 
 
 #if defined(__cplusplus)
diff --git a/library/json/test/test_tetengo.json.vcxproj b/library/json/test/test_tetengo.json.vcxproj
index 85044774..61538534 100644
--- a/library/json/test/test_tetengo.json.vcxproj
+++ b/library/json/test/test_tetengo.json.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/lattice/c/include/tetengo/lattice/constraint.h b/library/lattice/c/include/tetengo/lattice/constraint.h
index 93ecdf42..2478bc01 100644
--- a/library/lattice/c/include/tetengo/lattice/constraint.h
+++ b/library/lattice/c/include/tetengo/lattice/constraint.h
@@ -30,7 +30,7 @@ typedef struct tetengo_lattice_constraint_tag tetengo_lattice_constraint_t;
 
     \return A pointer to an empty constraint.
 */
-tetengo_lattice_constraint_t* tetengo_lattice_constraint_createEmpty();
+tetengo_lattice_constraint_t* tetengo_lattice_constraint_createEmpty(void);
 
 /*!
     \brief Creates a constraint.
diff --git a/library/lattice/c/include/tetengo/lattice/entry.h b/library/lattice/c/include/tetengo/lattice/entry.h
index 382295d1..af788c8e 100644
--- a/library/lattice/c/include/tetengo/lattice/entry.h
+++ b/library/lattice/c/include/tetengo/lattice/entry.h
@@ -107,7 +107,7 @@ tetengo_lattice_entry_keyHandle_t tetengo_lattice_entry_toKeyHandle(const teteng
 
     \return The pointer to the BOS/EOS entry.
 */
-const tetengo_lattice_entryView_t* tetengo_lattice_entryView_bosEos();
+const tetengo_lattice_entryView_t* tetengo_lattice_entryView_bosEos(void);
 
 /*!
     \brief Creates an entry view key by a handle.
diff --git a/library/lattice/c/include/tetengo/lattice/path.h b/library/lattice/c/include/tetengo/lattice/path.h
index 0e12da98..01790cc8 100644
--- a/library/lattice/c/include/tetengo/lattice/path.h
+++ b/library/lattice/c/include/tetengo/lattice/path.h
@@ -27,7 +27,7 @@ typedef struct tetengo_lattice_path_tag tetengo_lattice_path_t;
 
     \return A pointer to a path. Or NULL when p_nodes is NULL.
 */
-tetengo_lattice_path_t* tetengo_lattice_path_createEmpty();
+tetengo_lattice_path_t* tetengo_lattice_path_createEmpty(void);
 
 /*!
     \brief Creates a path.
diff --git a/library/lattice/c/src/tetengo_lattice_input.cpp b/library/lattice/c/src/tetengo_lattice_input.cpp
index 1a810a6c..ec76376a 100644
--- a/library/lattice/c/src/tetengo_lattice_input.cpp
+++ b/library/lattice/c/src/tetengo_lattice_input.cpp
@@ -8,7 +8,7 @@
 #include <cstddef>
 #include <memory>
 #include <stdexcept>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <utility>
 
 #include <boost/preprocessor.hpp>
diff --git a/library/lattice/c/src/tetengo_lattice_nBestIterator.cpp b/library/lattice/c/src/tetengo_lattice_nBestIterator.cpp
index c88d3d57..8ef326c4 100644
--- a/library/lattice/c/src/tetengo_lattice_nBestIterator.cpp
+++ b/library/lattice/c/src/tetengo_lattice_nBestIterator.cpp
@@ -4,7 +4,7 @@
     Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 */
 
-#include <algorithm>
+#include <algorithm> // IWYU pragma: keep
 #include <any>
 #include <iterator>
 #include <memory>
diff --git a/library/lattice/c/src/tetengo_lattice_vocabulary.cpp b/library/lattice/c/src/tetengo_lattice_vocabulary.cpp
index a843cfd1..674e601d 100644
--- a/library/lattice/c/src/tetengo_lattice_vocabulary.cpp
+++ b/library/lattice/c/src/tetengo_lattice_vocabulary.cpp
@@ -4,7 +4,7 @@
     Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 */
 
-#include <algorithm>
+#include <algorithm> // IWYU pragma: keep
 #include <any>
 #include <cassert>
 #include <cstddef>
@@ -29,7 +29,6 @@
 #include <tetengo/lattice/input.hpp>
 #include <tetengo/lattice/node.h>
 #include <tetengo/lattice/node.hpp>
-#include <tetengo/lattice/stringView.h>
 #include <tetengo/lattice/unordered_map_vocabulary.hpp>
 #include <tetengo/lattice/vocabulary.h>
 #include <tetengo/lattice/vocabulary.hpp>
diff --git a/library/lattice/c/tetengo.lattice.vcxproj b/library/lattice/c/tetengo.lattice.vcxproj
index 45bfcd04..af23c1ea 100644
--- a/library/lattice/c/tetengo.lattice.vcxproj
+++ b/library/lattice/c/tetengo.lattice.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/lattice/cpp/include/tetengo/lattice/path.hpp b/library/lattice/cpp/include/tetengo/lattice/path.hpp
index 1d04a68b..cea0db5d 100644
--- a/library/lattice/cpp/include/tetengo/lattice/path.hpp
+++ b/library/lattice/cpp/include/tetengo/lattice/path.hpp
@@ -9,7 +9,7 @@
 
 #include <vector>
 
-#include <tetengo/lattice/node.hpp>
+#include <tetengo/lattice/node.hpp> // IWYU pragma: keep
 
 
 namespace tetengo::lattice
diff --git a/library/lattice/cpp/include/tetengo/lattice/unordered_map_vocabulary.hpp b/library/lattice/cpp/include/tetengo/lattice/unordered_map_vocabulary.hpp
index 9bb5644e..bd9edcfb 100644
--- a/library/lattice/cpp/include/tetengo/lattice/unordered_map_vocabulary.hpp
+++ b/library/lattice/cpp/include/tetengo/lattice/unordered_map_vocabulary.hpp
@@ -14,15 +14,16 @@
 #include <utility>
 #include <vector>
 
-#include <tetengo/lattice/entry.hpp>
 #include <tetengo/lattice/vocabulary.hpp>
 
 
 namespace tetengo::lattice
 {
-    class connection;
-    class input;
-    class node;
+    class connection; // IWYU pragma: keep
+    class entry;
+    class entry_view;
+    class input; // IWYU pragma: keep
+    class node; // IWYU pragma: keep
 
 
     /*!
diff --git a/library/lattice/cpp/include/tetengo/lattice/vocabulary.hpp b/library/lattice/cpp/include/tetengo/lattice/vocabulary.hpp
index 5689734d..217559be 100644
--- a/library/lattice/cpp/include/tetengo/lattice/vocabulary.hpp
+++ b/library/lattice/cpp/include/tetengo/lattice/vocabulary.hpp
@@ -11,12 +11,11 @@
 
 #include <boost/core/noncopyable.hpp>
 
-#include <tetengo/lattice/entry.hpp>
-
 
 namespace tetengo::lattice
 {
     class connection;
+    class entry_view;
     class input;
     class node;
 
diff --git a/library/lattice/cpp/include/tetengo/lattice/wildcard_constraint_element.hpp b/library/lattice/cpp/include/tetengo/lattice/wildcard_constraint_element.hpp
index 71cfd0cb..87d84de2 100644
--- a/library/lattice/cpp/include/tetengo/lattice/wildcard_constraint_element.hpp
+++ b/library/lattice/cpp/include/tetengo/lattice/wildcard_constraint_element.hpp
@@ -15,7 +15,7 @@
 
 namespace tetengo::lattice
 {
-    class node;
+    class node; // IWYU pragma: keep
 
 
     /*!
diff --git a/library/lattice/cpp/src/tetengo.lattice.path.cpp b/library/lattice/cpp/src/tetengo.lattice.path.cpp
index 4ad1103b..e1d4843c 100644
--- a/library/lattice/cpp/src/tetengo.lattice.path.cpp
+++ b/library/lattice/cpp/src/tetengo.lattice.path.cpp
@@ -8,7 +8,7 @@
 #include <utility>
 #include <vector>
 
-#include <tetengo/lattice/node.hpp>
+#include <tetengo/lattice/node.hpp> // IWYU pragma: keep
 #include <tetengo/lattice/path.hpp>
 
 
diff --git a/library/lattice/cpp/src/tetengo.lattice.unordered_map_vocabulary.cpp b/library/lattice/cpp/src/tetengo.lattice.unordered_map_vocabulary.cpp
index ca324840..4007e262 100644
--- a/library/lattice/cpp/src/tetengo.lattice.unordered_map_vocabulary.cpp
+++ b/library/lattice/cpp/src/tetengo.lattice.unordered_map_vocabulary.cpp
@@ -11,7 +11,6 @@
 #include <limits>
 #include <memory>
 #include <string>
-#include <type_traits>
 #include <unordered_map>
 #include <utility>
 #include <vector>
diff --git a/library/lattice/cpp/src/tetengo.lattice.vocabulary.cpp b/library/lattice/cpp/src/tetengo.lattice.vocabulary.cpp
index 65b0b7ae..1e312a5c 100644
--- a/library/lattice/cpp/src/tetengo.lattice.vocabulary.cpp
+++ b/library/lattice/cpp/src/tetengo.lattice.vocabulary.cpp
@@ -7,7 +7,7 @@
 #include <vector>
 
 #include <tetengo/lattice/connection.hpp>
-#include <tetengo/lattice/entry.hpp>
+#include <tetengo/lattice/entry.hpp> // IWYU pragma: keep
 #include <tetengo/lattice/vocabulary.hpp>
 
 
diff --git a/library/lattice/cpp/tetengo.lattice.cpp.vcxproj b/library/lattice/cpp/tetengo.lattice.cpp.vcxproj
index 828d9d6e..e645927c 100644
--- a/library/lattice/cpp/tetengo.lattice.cpp.vcxproj
+++ b/library/lattice/cpp/tetengo.lattice.cpp.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/lattice/test/src/test_tetengo.lattice.constraint.cpp b/library/lattice/test/src/test_tetengo.lattice.constraint.cpp
index d440274c..f05302c2 100644
--- a/library/lattice/test/src/test_tetengo.lattice.constraint.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.constraint.cpp
@@ -11,7 +11,7 @@
 #include <iterator>
 #include <limits>
 #include <memory>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <vector>
 
 #include <boost/preprocessor.hpp>
diff --git a/library/lattice/test/src/test_tetengo.lattice.constraint_element.cpp b/library/lattice/test/src/test_tetengo.lattice.constraint_element.cpp
index 57c2a9c1..793508db 100644
--- a/library/lattice/test/src/test_tetengo.lattice.constraint_element.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.constraint_element.cpp
@@ -5,7 +5,7 @@
 */
 
 #include <any>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <vector>
 
 #include <boost/preprocessor.hpp>
diff --git a/library/lattice/test/src/test_tetengo.lattice.custom_input.cpp b/library/lattice/test/src/test_tetengo.lattice.custom_input.cpp
index 2707d80d..95c473fa 100644
--- a/library/lattice/test/src/test_tetengo.lattice.custom_input.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.custom_input.cpp
@@ -4,7 +4,7 @@
     Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 */
 
-#include <algorithm>
+#include <algorithm> // IWYU pragma: keep
 #include <iterator>
 #include <memory>
 #include <numeric>
diff --git a/library/lattice/test/src/test_tetengo.lattice.custom_vocabulary.cpp b/library/lattice/test/src/test_tetengo.lattice.custom_vocabulary.cpp
index d20a437b..8b2995f2 100644
--- a/library/lattice/test/src/test_tetengo.lattice.custom_vocabulary.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.custom_vocabulary.cpp
@@ -7,7 +7,6 @@
 #include <any>
 #include <cassert>
 #include <iterator>
-#include <memory>
 #include <string>
 #include <string_view>
 #include <vector>
diff --git a/library/lattice/test/src/test_tetengo.lattice.lattice.cpp b/library/lattice/test/src/test_tetengo.lattice.lattice.cpp
index bc73d624..5fafcf5e 100644
--- a/library/lattice/test/src/test_tetengo.lattice.lattice.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.lattice.cpp
@@ -4,14 +4,14 @@
     Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 */
 
-#include <algorithm>
+#include <algorithm> // IWYU pragma: keep
 #include <any>
 #include <cassert>
 #include <cstddef>
 #include <iterator>
 #include <memory>
 #include <stdexcept>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <type_traits> // IWYU pragma: keep
 #include <utility>
 #include <vector>
diff --git a/library/lattice/test/src/test_tetengo.lattice.n_best_iterator.cpp b/library/lattice/test/src/test_tetengo.lattice.n_best_iterator.cpp
index 54c8309f..de383564 100644
--- a/library/lattice/test/src/test_tetengo.lattice.n_best_iterator.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.n_best_iterator.cpp
@@ -4,7 +4,7 @@
     Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 */
 
-#include <algorithm>
+#include <algorithm> // IWYU pragma: keep
 #include <any>
 #include <cassert>
 #include <cstddef>
diff --git a/library/lattice/test/src/test_tetengo.lattice.node_constraint_element.cpp b/library/lattice/test/src/test_tetengo.lattice.node_constraint_element.cpp
index 0a415193..cd41325d 100644
--- a/library/lattice/test/src/test_tetengo.lattice.node_constraint_element.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.node_constraint_element.cpp
@@ -6,7 +6,7 @@
 
 #include <any>
 #include <iterator>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <utility>
 #include <vector>
 
diff --git a/library/lattice/test/src/test_tetengo.lattice.path.cpp b/library/lattice/test/src/test_tetengo.lattice.path.cpp
index a28875e0..e11bd22c 100644
--- a/library/lattice/test/src/test_tetengo.lattice.path.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.path.cpp
@@ -8,7 +8,7 @@
 #include <any>
 #include <cstddef>
 #include <iterator>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <vector>
 
 #include <boost/preprocessor.hpp>
diff --git a/library/lattice/test/src/test_tetengo.lattice.vocabulary.cpp b/library/lattice/test/src/test_tetengo.lattice.vocabulary.cpp
index 78410b97..5f5e6c85 100644
--- a/library/lattice/test/src/test_tetengo.lattice.vocabulary.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.vocabulary.cpp
@@ -8,7 +8,6 @@
 #include <cstddef>
 #include <iterator>
 #include <limits>
-#include <memory>
 #include <string>
 #include <vector>
 
@@ -51,7 +50,7 @@ namespace
     public:
         // constructors and destructors
 
-        concrete_vocabulary(){};
+        concrete_vocabulary() {};
 
         virtual ~concrete_vocabulary() = default;
 
diff --git a/library/lattice/test/src/test_tetengo.lattice.wildcard_constraint_element.cpp b/library/lattice/test/src/test_tetengo.lattice.wildcard_constraint_element.cpp
index 65188a64..ba48d241 100644
--- a/library/lattice/test/src/test_tetengo.lattice.wildcard_constraint_element.cpp
+++ b/library/lattice/test/src/test_tetengo.lattice.wildcard_constraint_element.cpp
@@ -8,7 +8,7 @@
 #include <cstddef>
 #include <iterator>
 #include <limits>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <vector>
 
 #include <boost/preprocessor.hpp>
diff --git a/library/lattice/test/src/usage_tetengo.lattice.viterbi_c.c b/library/lattice/test/src/usage_tetengo.lattice.viterbi_c.c
index f9a3b831..0e7ac9db 100644
--- a/library/lattice/test/src/usage_tetengo.lattice.viterbi_c.c
+++ b/library/lattice/test/src/usage_tetengo.lattice.viterbi_c.c
@@ -21,14 +21,13 @@
 #include <tetengo/lattice/nBestIterator.h>
 #include <tetengo/lattice/node.h>
 #include <tetengo/lattice/path.h>
-#include <tetengo/lattice/stringView.h>
 #include <tetengo/lattice/vocabulary.h>
 
 
-tetengo_lattice_vocabulary_t* build_vocabulary();
+tetengo_lattice_vocabulary_t* build_vocabulary(void);
 const char*                   to_string(const tetengo_lattice_path_t* p_path);
 
-void usage_tetengo_lattice_viterbi()
+void usage_tetengo_lattice_viterbi(void)
 {
     /*
         Makes the following lattice and searches it.
@@ -144,7 +143,7 @@ entry_equal_to(const tetengo_lattice_entryView_t* const p_entry1, const tetengo_
     return equality;
 }
 
-tetengo_lattice_vocabulary_t* build_vocabulary()
+tetengo_lattice_vocabulary_t* build_vocabulary(void)
 {
     // The contents of the vocabulary.
     const tetengo_lattice_input_t* const    p_entry_key_a = tetengo_lattice_input_createStringInput("a");
diff --git a/library/lattice/test/src/usage_tetengo.lattice.viterbi_c.h b/library/lattice/test/src/usage_tetengo.lattice.viterbi_c.h
index 0631cf66..be2b0bd9 100644
--- a/library/lattice/test/src/usage_tetengo.lattice.viterbi_c.h
+++ b/library/lattice/test/src/usage_tetengo.lattice.viterbi_c.h
@@ -13,7 +13,7 @@
 extern "C" {
 #endif
 
-void usage_tetengo_lattice_viterbi();
+void usage_tetengo_lattice_viterbi(void);
 
 
 #if defined(__cplusplus)
diff --git a/library/lattice/test/src/usage_tetengo.lattice.viterbi_cpp.cpp b/library/lattice/test/src/usage_tetengo.lattice.viterbi_cpp.cpp
index c4a39a46..266716c7 100644
--- a/library/lattice/test/src/usage_tetengo.lattice.viterbi_cpp.cpp
+++ b/library/lattice/test/src/usage_tetengo.lattice.viterbi_cpp.cpp
@@ -10,6 +10,7 @@
 #include <algorithm>
 #include <any>
 #include <cassert>
+#include <cstddef>
 #include <iterator>
 #include <memory>
 #include <string>
diff --git a/library/lattice/test/test_tetengo.lattice.vcxproj b/library/lattice/test/test_tetengo.lattice.vcxproj
index 8622b80d..326c8df8 100644
--- a/library/lattice/test/test_tetengo.lattice.vcxproj
+++ b/library/lattice/test/test_tetengo.lattice.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/platform_dependent/cpp/tetengo.platform_dependent.cpp.vcxproj b/library/platform_dependent/cpp/tetengo.platform_dependent.cpp.vcxproj
index 82999cd2..b0c360d0 100644
--- a/library/platform_dependent/cpp/tetengo.platform_dependent.cpp.vcxproj
+++ b/library/platform_dependent/cpp/tetengo.platform_dependent.cpp.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/platform_dependent/test/src/test_tetengo.platform_dependent.text_eX.cpp b/library/platform_dependent/test/src/test_tetengo.platform_dependent.text_eX.cpp
index 079de7d2..b629c17f 100644
--- a/library/platform_dependent/test/src/test_tetengo.platform_dependent.text_eX.cpp
+++ b/library/platform_dependent/test/src/test_tetengo.platform_dependent.text_eX.cpp
@@ -5,11 +5,8 @@
 */
 
 #include <iterator>
-#include <map>
 #include <regex>
-#include <sstream>
 #include <string>
-#include <vector>
 
 #include <boost/preprocessor.hpp>
 #include <boost/test/unit_test.hpp>
diff --git a/library/platform_dependent/test/test_tetengo.platform_dependent.vcxproj b/library/platform_dependent/test/test_tetengo.platform_dependent.vcxproj
index c15d1850..63c8a1f4 100644
--- a/library/platform_dependent/test/test_tetengo.platform_dependent.vcxproj
+++ b/library/platform_dependent/test/test_tetengo.platform_dependent.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/property/c/include/tetengo/property/storage.h b/library/property/c/include/tetengo/property/storage.h
index 963bb0d7..57f00315 100644
--- a/library/property/c/include/tetengo/property/storage.h
+++ b/library/property/c/include/tetengo/property/storage.h
@@ -111,21 +111,21 @@ void tetengo_property_storage_save(const tetengo_property_storage_t* p_storage);
 
     \return A pointer to a storage loader.
 */
-tetengo_property_storageLoader_t* tetengo_property_storageLoader_createMemoryStorageLoader();
+tetengo_property_storageLoader_t* tetengo_property_storageLoader_createMemoryStorageLoader(void);
 
 /*!
     \brief Creates a file storage loader.
 
     \return A pointer to a storage loader.
 */
-tetengo_property_storageLoader_t* tetengo_property_storageLoader_createFileStorageLoader();
+tetengo_property_storageLoader_t* tetengo_property_storageLoader_createFileStorageLoader(void);
 
 /*!
     \brief Creates a Windows registry storage loader.
 
     \return A pointer to a storage loader.
 */
-tetengo_property_storageLoader_t* tetengo_property_storageLoader_createWindowsRegistoryStorageLoader();
+tetengo_property_storageLoader_t* tetengo_property_storageLoader_createWindowsRegistoryStorageLoader(void);
 
 /*!
     \brief Creates a storage loader proxy.
diff --git a/library/property/c/src/tetengo_property_propertySet.cpp b/library/property/c/src/tetengo_property_propertySet.cpp
index 90581839..8295c48d 100644
--- a/library/property/c/src/tetengo_property_propertySet.cpp
+++ b/library/property/c/src/tetengo_property_propertySet.cpp
@@ -6,6 +6,7 @@
 
 #include <algorithm>
 #include <cstdint>
+#include <filesystem>
 #include <iterator>
 #include <memory>
 #include <optional>
diff --git a/library/property/c/src/tetengo_property_storage.cpp b/library/property/c/src/tetengo_property_storage.cpp
index 08e41319..7443c375 100644
--- a/library/property/c/src/tetengo_property_storage.cpp
+++ b/library/property/c/src/tetengo_property_storage.cpp
@@ -5,6 +5,7 @@
 */
 
 #include <algorithm>
+#include <filesystem>
 #include <iterator>
 #include <memory>
 #include <optional>
diff --git a/library/property/c/tetengo.property.vcxproj b/library/property/c/tetengo.property.vcxproj
index 0302f9ab..be86eb8f 100644
--- a/library/property/c/tetengo.property.vcxproj
+++ b/library/property/c/tetengo.property.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/property/cpp/include/tetengo/property/memory_storage.hpp b/library/property/cpp/include/tetengo/property/memory_storage.hpp
index dfe60cfd..80083090 100644
--- a/library/property/cpp/include/tetengo/property/memory_storage.hpp
+++ b/library/property/cpp/include/tetengo/property/memory_storage.hpp
@@ -7,7 +7,7 @@
 #if !defined(TETENGO_PROPERTY_MEMORYSTORAGE_HPP)
 #define TETENGO_PROPERTY_MEMORYSTORAGE_HPP
 
-#include <filesystem>
+#include <filesystem> // IWYU pragma: keep
 #include <memory>
 
 #include <tetengo/property/storage.hpp>
diff --git a/library/property/cpp/include/tetengo/property/storage_proxy.hpp b/library/property/cpp/include/tetengo/property/storage_proxy.hpp
index 66763f00..770db35a 100644
--- a/library/property/cpp/include/tetengo/property/storage_proxy.hpp
+++ b/library/property/cpp/include/tetengo/property/storage_proxy.hpp
@@ -10,7 +10,7 @@
 #include <cstdint>
 #include <filesystem>
 #include <memory>
-#include <optional>
+#include <optional> // IWYU pragma: keep
 #include <string>
 
 #include <tetengo/property/storage.hpp>
diff --git a/library/property/cpp/src/tetengo.property.file_storage.cpp b/library/property/cpp/src/tetengo.property.file_storage.cpp
index 6753d45e..535a89af 100644
--- a/library/property/cpp/src/tetengo.property.file_storage.cpp
+++ b/library/property/cpp/src/tetengo.property.file_storage.cpp
@@ -9,6 +9,7 @@
 #include <fstream>
 #include <memory>
 #include <stdexcept>
+#include <string> // IWYU pragma: keep
 #include <utility>
 
 #include <boost/core/noncopyable.hpp>
diff --git a/library/property/cpp/src/tetengo.property.json_parser.cpp b/library/property/cpp/src/tetengo.property.json_parser.cpp
index d01dfd9f..eb9b2bb6 100644
--- a/library/property/cpp/src/tetengo.property.json_parser.cpp
+++ b/library/property/cpp/src/tetengo.property.json_parser.cpp
@@ -14,9 +14,9 @@
 #include <stdexcept>
 #include <string>
 #include <string_view>
-#include <type_traits>
 #include <unordered_map>
 #include <utility>
+#include <variant> // IWYU pragma: keep
 
 #include <boost/core/noncopyable.hpp>
 
diff --git a/library/property/cpp/tetengo.property.cpp.vcxproj b/library/property/cpp/tetengo.property.cpp.vcxproj
index f1d4449b..fdafc46c 100644
--- a/library/property/cpp/tetengo.property.cpp.vcxproj
+++ b/library/property/cpp/tetengo.property.cpp.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/property/test/src/test_tetengo.property.memory_storage.cpp b/library/property/test/src/test_tetengo.property.memory_storage.cpp
index cff4ef3f..3e49d900 100644
--- a/library/property/test/src/test_tetengo.property.memory_storage.cpp
+++ b/library/property/test/src/test_tetengo.property.memory_storage.cpp
@@ -8,7 +8,7 @@
 #include <filesystem>
 #include <memory>
 #include <optional>
-#include <string>
+#include <string> // IWYU pragma: keep
 
 #include <boost/preprocessor.hpp>
 #include <boost/scope_exit.hpp>
diff --git a/library/property/test/src/test_tetengo.property.property_set.cpp b/library/property/test/src/test_tetengo.property.property_set.cpp
index 3eb5e44d..541d3f37 100644
--- a/library/property/test/src/test_tetengo.property.property_set.cpp
+++ b/library/property/test/src/test_tetengo.property.property_set.cpp
@@ -9,7 +9,7 @@
 #include <iterator>
 #include <memory>
 #include <optional>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <string_view>
 #include <utility>
 #include <vector>
diff --git a/library/property/test/src/test_tetengo.property.storage.cpp b/library/property/test/src/test_tetengo.property.storage.cpp
index d6fe8630..fb58742b 100644
--- a/library/property/test/src/test_tetengo.property.storage.cpp
+++ b/library/property/test/src/test_tetengo.property.storage.cpp
@@ -9,7 +9,7 @@
 #include <iterator>
 #include <memory>
 #include <optional>
-#include <string>
+#include <string> // IWYU pragma: keep
 #include <string_view>
 #include <unordered_map>
 #include <utility>
diff --git a/library/property/test/src/test_tetengo.property.storage_proxy.cpp b/library/property/test/src/test_tetengo.property.storage_proxy.cpp
index 968f2e3c..e50f4880 100644
--- a/library/property/test/src/test_tetengo.property.storage_proxy.cpp
+++ b/library/property/test/src/test_tetengo.property.storage_proxy.cpp
@@ -5,6 +5,7 @@
 */
 
 #include <cstdint>
+#include <filesystem>
 #include <iterator>
 #include <memory>
 #include <optional>
diff --git a/library/property/test/src/usage_tetengo.property.saveLoad_c.c b/library/property/test/src/usage_tetengo.property.saveLoad_c.c
index df538a83..cb044964 100644
--- a/library/property/test/src/usage_tetengo.property.saveLoad_c.c
+++ b/library/property/test/src/usage_tetengo.property.saveLoad_c.c
@@ -17,11 +17,11 @@
 #include <tetengo/property/storage.h>
 
 
-static const char* setting_file_path();
+static const char* setting_file_path(void);
 
 static int file_exists(const char* path);
 
-void usage_tetengo_property_saveLoad()
+void usage_tetengo_property_saveLoad(void)
 {
     assert(!file_exists(setting_file_path()));
 
@@ -83,7 +83,7 @@ void usage_tetengo_property_saveLoad()
     tetengo_property_propertySet_destroy(p_props_for_setting);
 }
 
-static const char* setting_file_path()
+static const char* setting_file_path(void)
 {
     static char path[4096] = { '\0' };
     if (path[0] == '\0')
diff --git a/library/property/test/src/usage_tetengo.property.saveLoad_c.h b/library/property/test/src/usage_tetengo.property.saveLoad_c.h
index 85e61c5c..bff12902 100644
--- a/library/property/test/src/usage_tetengo.property.saveLoad_c.h
+++ b/library/property/test/src/usage_tetengo.property.saveLoad_c.h
@@ -13,7 +13,7 @@
 extern "C" {
 #endif
 
-void usage_tetengo_property_saveLoad();
+void usage_tetengo_property_saveLoad(void);
 
 
 #if defined(__cplusplus)
diff --git a/library/property/test/test_tetengo.property.vcxproj b/library/property/test/test_tetengo.property.vcxproj
index 80a5eeb6..e84069bc 100644
--- a/library/property/test/test_tetengo.property.vcxproj
+++ b/library/property/test/test_tetengo.property.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/text/c/include/tetengo/text/graphemeSplitter.h b/library/text/c/include/tetengo/text/graphemeSplitter.h
index 382bf305..540b5833 100644
--- a/library/text/c/include/tetengo/text/graphemeSplitter.h
+++ b/library/text/c/include/tetengo/text/graphemeSplitter.h
@@ -41,7 +41,7 @@ typedef struct tetengo_text_grapheme_tag
 
     \return A pointer to a grapheme splitter.
 */
-tetengo_text_graphemeSplitter_t* tetengo_text_graphemeSplitter_create();
+tetengo_text_graphemeSplitter_t* tetengo_text_graphemeSplitter_create(void);
 
 /*!
     \brief Destroys a grapheme splitter.
diff --git a/library/text/c/src/tetengo_text_encoder.cpp b/library/text/c/src/tetengo_text_encoder.cpp
index 3daa5467..e74e4237 100644
--- a/library/text/c/src/tetengo_text_encoder.cpp
+++ b/library/text/c/src/tetengo_text_encoder.cpp
@@ -9,8 +9,7 @@
 #include <cstddef>
 #include <iterator>
 #include <stdexcept>
-#include <string>
-#include <string_view>
+#include <string> // IWYU pragma: keep
 
 #include <tetengo/text/encoder.h>
 #include <tetengo/text/encoder.hpp>
diff --git a/library/text/c/tetengo.text.vcxproj b/library/text/c/tetengo.text.vcxproj
index 7285ec62..5eb627fd 100644
--- a/library/text/c/tetengo.text.vcxproj
+++ b/library/text/c/tetengo.text.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/text/cpp/src/tetengo.text.encoding.cp932.cpp b/library/text/cpp/src/tetengo.text.encoding.cp932.cpp
index be02eaf5..4f4292a6 100644
--- a/library/text/cpp/src/tetengo.text.encoding.cp932.cpp
+++ b/library/text/cpp/src/tetengo.text.encoding.cp932.cpp
@@ -5,6 +5,7 @@
 */
 
 #include <memory>
+#include <string> // IWYU pragma: keep
 
 #include <boost/core/noncopyable.hpp>
 
diff --git a/library/text/cpp/src/tetengo.text.encoding.utf16.cpp b/library/text/cpp/src/tetengo.text.encoding.utf16.cpp
index 0d4434a1..6a0d3636 100644
--- a/library/text/cpp/src/tetengo.text.encoding.utf16.cpp
+++ b/library/text/cpp/src/tetengo.text.encoding.utf16.cpp
@@ -7,6 +7,7 @@
 #include <memory>
 #include <string>
 #include <utility>
+#include <vector>
 
 #include <boost/core/noncopyable.hpp>
 
diff --git a/library/text/cpp/src/tetengo.text.grapheme_splitting.default_character_widX.cpp b/library/text/cpp/src/tetengo.text.grapheme_splitting.default_character_widX.cpp
index b719bd3e..259a4739 100644
--- a/library/text/cpp/src/tetengo.text.grapheme_splitting.default_character_widX.cpp
+++ b/library/text/cpp/src/tetengo.text.grapheme_splitting.default_character_widX.cpp
@@ -9,7 +9,6 @@
 
 #include <boost/core/noncopyable.hpp>
 
-#include <tetengo/text/grapheme_splitting/character_width.hpp>
 #include <tetengo/text/grapheme_splitting/default_characterX.hpp>
 
 
diff --git a/library/text/cpp/src/tetengo.text.grapheme_splitting.east_asian_character_X.cpp b/library/text/cpp/src/tetengo.text.grapheme_splitting.east_asian_character_X.cpp
index fe5d4621..5b27b712 100644
--- a/library/text/cpp/src/tetengo.text.grapheme_splitting.east_asian_character_X.cpp
+++ b/library/text/cpp/src/tetengo.text.grapheme_splitting.east_asian_character_X.cpp
@@ -9,7 +9,6 @@
 
 #include <boost/core/noncopyable.hpp>
 
-#include <tetengo/text/grapheme_splitting/character_width.hpp>
 #include <tetengo/text/grapheme_splitting/east_asian_characX.hpp>
 
 
diff --git a/library/text/cpp/tetengo.text.cpp.vcxproj b/library/text/cpp/tetengo.text.cpp.vcxproj
index 1d1728d0..75731ef3 100644
--- a/library/text/cpp/tetengo.text.cpp.vcxproj
+++ b/library/text/cpp/tetengo.text.cpp.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/text/test/src/test_tetengo.text.encoder.cpp b/library/text/test/src/test_tetengo.text.encoder.cpp
index 6488d24e..c4cb5653 100644
--- a/library/text/test/src/test_tetengo.text.encoder.cpp
+++ b/library/text/test/src/test_tetengo.text.encoder.cpp
@@ -5,9 +5,7 @@
 */
 
 #include <iterator>
-#include <map>
 #include <regex>
-#include <sstream>
 #include <string>
 #include <string_view>
 #include <vector>
diff --git a/library/text/test/src/test_tetengo.text.encoding.cp932.cpp b/library/text/test/src/test_tetengo.text.encoding.cp932.cpp
index d284bc6a..a8aa3bd9 100644
--- a/library/text/test/src/test_tetengo.text.encoding.cp932.cpp
+++ b/library/text/test/src/test_tetengo.text.encoding.cp932.cpp
@@ -5,11 +5,8 @@
 */
 
 #include <iterator>
-#include <map>
 #include <regex>
-#include <sstream>
 #include <string>
-#include <vector>
 
 #include <boost/preprocessor.hpp>
 #include <boost/test/unit_test.hpp>
diff --git a/library/text/test/src/test_tetengo.text.grapheme_splitter.cpp b/library/text/test/src/test_tetengo.text.grapheme_splitter.cpp
index 5957e6ed..80ad50af 100644
--- a/library/text/test/src/test_tetengo.text.grapheme_splitter.cpp
+++ b/library/text/test/src/test_tetengo.text.grapheme_splitter.cpp
@@ -7,7 +7,6 @@
 #include <clocale>
 #include <iterator>
 #include <locale>
-#include <memory>
 #include <optional>
 #include <stdexcept>
 #include <string>
diff --git a/library/text/test/src/usage_tetengo.text.encoding_c.c b/library/text/test/src/usage_tetengo.text.encoding_c.c
index b15e710f..ff1441a1 100644
--- a/library/text/test/src/usage_tetengo.text.encoding_c.c
+++ b/library/text/test/src/usage_tetengo.text.encoding_c.c
@@ -16,7 +16,7 @@
 
 static int equal(const unsigned short* string1, const unsigned short* string2);
 
-void usage_tetengo_text_encoding()
+void usage_tetengo_text_encoding(void)
 {
     static const char utf8[] = {
         // clang-format off
diff --git a/library/text/test/src/usage_tetengo.text.encoding_c.h b/library/text/test/src/usage_tetengo.text.encoding_c.h
index 07fff352..f78dd422 100644
--- a/library/text/test/src/usage_tetengo.text.encoding_c.h
+++ b/library/text/test/src/usage_tetengo.text.encoding_c.h
@@ -13,7 +13,7 @@
 extern "C" {
 #endif
 
-void usage_tetengo_text_encoding();
+void usage_tetengo_text_encoding(void);
 
 
 #if defined(__cplusplus)
diff --git a/library/text/test/src/usage_tetengo.text.graphemeSplit_c.c b/library/text/test/src/usage_tetengo.text.graphemeSplit_c.c
index 476f9718..fa701040 100644
--- a/library/text/test/src/usage_tetengo.text.graphemeSplit_c.c
+++ b/library/text/test/src/usage_tetengo.text.graphemeSplit_c.c
@@ -17,11 +17,11 @@
 
 static void save_current_locale(int category, char* storage, size_t storage_capacity);
 
-static const char* japanese_locale_name();
+static const char* japanese_locale_name(void);
 
-static const char* english_locale_name();
+static const char* english_locale_name(void);
 
-void usage_tetengo_text_graphemeSplit()
+void usage_tetengo_text_graphemeSplit(void)
 {
     static const char string[] = {
         // clang-format off
@@ -125,7 +125,7 @@ static void save_current_locale(const int category, char* const storage, const s
     }
 }
 
-static const char* japanese_locale_name()
+static const char* japanese_locale_name(void)
 {
 #if defined(_WIN32)
     return "Japanese_Japan.932";
@@ -134,7 +134,7 @@ static const char* japanese_locale_name()
 #endif
 }
 
-static const char* english_locale_name()
+static const char* english_locale_name(void)
 {
 #if defined(_WIN32)
     return "English_United States.1252";
diff --git a/library/text/test/src/usage_tetengo.text.graphemeSplit_c.h b/library/text/test/src/usage_tetengo.text.graphemeSplit_c.h
index ee754dab..48d3c2c2 100644
--- a/library/text/test/src/usage_tetengo.text.graphemeSplit_c.h
+++ b/library/text/test/src/usage_tetengo.text.graphemeSplit_c.h
@@ -13,7 +13,7 @@
 extern "C" {
 #endif
 
-void usage_tetengo_text_graphemeSplit();
+void usage_tetengo_text_graphemeSplit(void);
 
 
 #if defined(__cplusplus)
diff --git a/library/text/test/src/usage_tetengo.text.grapheme_split_cpp.cpp b/library/text/test/src/usage_tetengo.text.grapheme_split_cpp.cpp
index 08204f65..2b5002a6 100644
--- a/library/text/test/src/usage_tetengo.text.grapheme_split_cpp.cpp
+++ b/library/text/test/src/usage_tetengo.text.grapheme_split_cpp.cpp
@@ -10,7 +10,6 @@
 #include <cassert>
 #include <iterator>
 #include <locale>
-#include <memory>
 #include <optional>
 #include <stdexcept>
 #include <string>
diff --git a/library/text/test/test_tetengo.text.vcxproj b/library/text/test/test_tetengo.text.vcxproj
index aa712c70..7b11205d 100644
--- a/library/text/test/test_tetengo.text.vcxproj
+++ b/library/text/test/test_tetengo.text.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/trie/c/include/tetengo/trie/storage.h b/library/trie/c/include/tetengo/trie/storage.h
index ed59e608..40125e1a 100644
--- a/library/trie/c/include/tetengo/trie/storage.h
+++ b/library/trie/c/include/tetengo/trie/storage.h
@@ -45,7 +45,7 @@ typedef char path_character_type;
 
     \return The check value for a vacant element.
 */
-uint8_t tetengo_trie_storage_vacantCheckValue();
+uint8_t tetengo_trie_storage_vacantCheckValue(void);
 
 /*!
     \brief Creates a storage.
diff --git a/library/trie/c/src/tetengo_trie_trie.hpp b/library/trie/c/src/tetengo_trie_trie.hpp
index bd423868..3dec0cd4 100644
--- a/library/trie/c/src/tetengo_trie_trie.hpp
+++ b/library/trie/c/src/tetengo_trie_trie.hpp
@@ -14,6 +14,7 @@
 
 #include <boost/interprocess/file_mapping.hpp>
 
+#include <tetengo/trie/default_serializer.hpp> // IWYU pragma: keep
 #include <tetengo/trie/storage.h>
 #include <tetengo/trie/trie.hpp>
 
diff --git a/library/trie/c/src/tetengo_trie_trieIterator.cpp b/library/trie/c/src/tetengo_trie_trieIterator.cpp
index c6dd1c7c..296dc3bc 100644
--- a/library/trie/c/src/tetengo_trie_trieIterator.cpp
+++ b/library/trie/c/src/tetengo_trie_trieIterator.cpp
@@ -8,6 +8,7 @@
 #include <memory>
 #include <stdexcept>
 #include <utility>
+#include <vector>
 
 #include <boost/stl_interfaces/iterator_interface.hpp> // IWYU pragma: keep
 
diff --git a/library/trie/c/tetengo.trie.vcxproj b/library/trie/c/tetengo.trie.vcxproj
index 7e8124f1..95da0c1e 100644
--- a/library/trie/c/tetengo.trie.vcxproj
+++ b/library/trie/c/tetengo.trie.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/trie/cpp/include/tetengo/trie/double_array.hpp b/library/trie/cpp/include/tetengo/trie/double_array.hpp
index 97539c7c..83ebac84 100644
--- a/library/trie/cpp/include/tetengo/trie/double_array.hpp
+++ b/library/trie/cpp/include/tetengo/trie/double_array.hpp
@@ -19,11 +19,10 @@
 
 #include <boost/core/noncopyable.hpp>
 
-#include <tetengo/trie/double_array_iterator.hpp>
-
-
 namespace tetengo::trie
 {
+    class double_array_iterator;
+
     class storage;
 
 
diff --git a/library/trie/cpp/include/tetengo/trie/memory_storage.hpp b/library/trie/cpp/include/tetengo/trie/memory_storage.hpp
index 67540c86..ddf47846 100644
--- a/library/trie/cpp/include/tetengo/trie/memory_storage.hpp
+++ b/library/trie/cpp/include/tetengo/trie/memory_storage.hpp
@@ -7,7 +7,7 @@
 #if !defined(TETENGO_TRIE_MEMORYSTORAGE_HPP)
 #define TETENGO_TRIE_MEMORYSTORAGE_HPP
 
-#include <any>
+#include <any> // IWYU pragma: keep
 #include <cstddef> // IWYU pragma: keep
 #include <cstdint>
 #include <istream>
@@ -19,7 +19,7 @@
 namespace tetengo::trie
 {
     class value_deserializer;
-    class value_serializer;
+    class value_serializer; // IWYU pragma: keep
 
 
     /*!
diff --git a/library/trie/cpp/include/tetengo/trie/mmap_storage.hpp b/library/trie/cpp/include/tetengo/trie/mmap_storage.hpp
index 03e48c74..f3f322ed 100644
--- a/library/trie/cpp/include/tetengo/trie/mmap_storage.hpp
+++ b/library/trie/cpp/include/tetengo/trie/mmap_storage.hpp
@@ -7,7 +7,7 @@
 #if !defined(TETENGO_TRIE_MMAPSTORAGE_HPP)
 #define TETENGO_TRIE_MMAPSTORAGE_HPP
 
-#include <any>
+#include <any> // IWYU pragma: keep
 #include <cstddef> // IWYU pragma: keep
 #include <cstdint>
 #include <istream>
diff --git a/library/trie/cpp/include/tetengo/trie/shared_storage.hpp b/library/trie/cpp/include/tetengo/trie/shared_storage.hpp
index 03f9dcdd..5efaebee 100644
--- a/library/trie/cpp/include/tetengo/trie/shared_storage.hpp
+++ b/library/trie/cpp/include/tetengo/trie/shared_storage.hpp
@@ -7,7 +7,7 @@
 #if !defined(TETENGO_TRIE_SHAREDSTORAGE_HPP)
 #define TETENGO_TRIE_SHAREDSTORAGE_HPP
 
-#include <any>
+#include <any> // IWYU pragma: keep
 #include <cstddef> // IWYU pragma: keep
 #include <cstdint>
 #include <istream>
@@ -19,7 +19,7 @@
 namespace tetengo::trie
 {
     class value_deserializer;
-    class value_serializer;
+    class value_serializer; // IWYU pragma: keep
 
 
     /*!
diff --git a/library/trie/cpp/include/tetengo/trie/trie.hpp b/library/trie/cpp/include/tetengo/trie/trie.hpp
index 0a3b5520..3370b0b2 100644
--- a/library/trie/cpp/include/tetengo/trie/trie.hpp
+++ b/library/trie/cpp/include/tetengo/trie/trie.hpp
@@ -22,12 +22,15 @@
 
 #include <boost/core/noncopyable.hpp>
 
-#include <tetengo/trie/default_serializer.hpp>
+#include <tetengo/trie/default_serializer.hpp> // IWYU pragma: keep
 #include <tetengo/trie/trie_iterator.hpp>
 
 
 namespace tetengo::trie
 {
+    template <typename Object, typename>
+    class default_serializer; // IWYU pragma: keep
+
     class double_array;
     class storage;
 
@@ -220,7 +223,7 @@ namespace tetengo::trie
         \tparam Value         A value type.
         \tparam KeySerializer A key serializer type.
     */
-    template <typename Key, typename Value, typename KeySerializer = default_serializer<Key>>
+    template <typename Key, typename Value, typename KeySerializer = default_serializer<Key, void>>
     class trie : private boost::noncopyable
     {
     public:
@@ -272,7 +275,7 @@ namespace tetengo::trie
 
             \param key_serializer A key serializer.
         */
-        explicit trie(const key_serializer_type& key_serializer = default_serializer<key_type>{ true }) :
+        explicit trie(const key_serializer_type& key_serializer = default_serializer<key_type, void>{ true }) :
         m_impl{},
         m_key_serializer{ key_serializer }
         {}
@@ -287,7 +290,7 @@ namespace tetengo::trie
         */
         explicit trie(
             std::initializer_list<std::pair<key_type, value_type>> elements,
-            const key_serializer_type&        key_serializer = default_serializer<key_type>{ true },
+            const key_serializer_type&        key_serializer = default_serializer<key_type, void>{ true },
             const building_observer_set_type& building_observer_set = null_building_observer_set(),
             std::size_t                       double_array_density_factor = default_double_array_density_factor()) :
         m_impl{ serialize_key<true>(std::begin(elements), std::end(elements), key_serializer),
@@ -311,7 +314,7 @@ namespace tetengo::trie
         trie(
             InputIterator                     first,
             InputIterator                     last,
-            const key_serializer_type&        key_serializer = default_serializer<key_type>{ true },
+            const key_serializer_type&        key_serializer = default_serializer<key_type, void>{ true },
             const building_observer_set_type& building_observer_set = null_building_observer_set(),
             std::size_t                       double_array_density_factor = default_double_array_density_factor()) :
         m_impl{ serialize_key<false>(first, last, key_serializer), building_observer_set, double_array_density_factor },
@@ -333,7 +336,7 @@ namespace tetengo::trie
         trie(
             std::move_iterator<InputIterator> first,
             std::move_iterator<InputIterator> last,
-            const key_serializer_type&        key_serializer = default_serializer<key_type>{ true },
+            const key_serializer_type&        key_serializer = default_serializer<key_type, void>{ true },
             const building_observer_set_type& building_observer_set = null_building_observer_set(),
             std::size_t                       double_array_density_factor = default_double_array_density_factor()) :
         m_impl{ serialize_key<true>(first, last, key_serializer), building_observer_set, double_array_density_factor },
@@ -348,7 +351,7 @@ namespace tetengo::trie
         */
         explicit trie(
             std::unique_ptr<storage>&& p_storage,
-            const key_serializer_type& key_serializer = default_serializer<key_type>{ true }) :
+            const key_serializer_type& key_serializer = default_serializer<key_type, void>{ true }) :
         m_impl{ std::move(p_storage) },
         m_key_serializer{ key_serializer }
         {}
diff --git a/library/trie/cpp/src/tetengo.trie.double_array_builder.hpp b/library/trie/cpp/src/tetengo.trie.double_array_builder.hpp
index c8b88500..e8eec807 100644
--- a/library/trie/cpp/src/tetengo.trie.double_array_builder.hpp
+++ b/library/trie/cpp/src/tetengo.trie.double_array_builder.hpp
@@ -11,6 +11,7 @@
 
 #include <cstddef>
 #include <cstdint>
+#include <iterator> // IWYU pragma: keep
 #include <memory>
 #include <string_view>
 #include <unordered_set>
diff --git a/library/trie/cpp/src/tetengo.trie.double_array_iterator.cpp b/library/trie/cpp/src/tetengo.trie.double_array_iterator.cpp
index 4938d85e..86bb800f 100644
--- a/library/trie/cpp/src/tetengo.trie.double_array_iterator.cpp
+++ b/library/trie/cpp/src/tetengo.trie.double_array_iterator.cpp
@@ -7,7 +7,6 @@
 #include <cstddef>
 #include <cstdint>
 #include <iterator>
-#include <memory>
 #include <optional>
 #include <stack>
 #include <stdexcept>
diff --git a/library/trie/cpp/src/tetengo.trie.mmap_storage.cpp b/library/trie/cpp/src/tetengo.trie.mmap_storage.cpp
index 96e53ab1..bed4ae41 100644
--- a/library/trie/cpp/src/tetengo.trie.mmap_storage.cpp
+++ b/library/trie/cpp/src/tetengo.trie.mmap_storage.cpp
@@ -14,7 +14,6 @@
 #include <memory>
 #include <optional>
 #include <stdexcept>
-#include <type_traits>
 #include <unordered_map>
 #include <utility>
 #include <vector>
diff --git a/library/trie/cpp/tetengo.trie.cpp.vcxproj b/library/trie/cpp/tetengo.trie.cpp.vcxproj
index 883c60c0..57373497 100644
--- a/library/trie/cpp/tetengo.trie.cpp.vcxproj
+++ b/library/trie/cpp/tetengo.trie.cpp.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/library/trie/test/src/test_tetengo.trie.memory_storage.cpp b/library/trie/test/src/test_tetengo.trie.memory_storage.cpp
index c64eac2d..d8c020ac 100644
--- a/library/trie/test/src/test_tetengo.trie.memory_storage.cpp
+++ b/library/trie/test/src/test_tetengo.trie.memory_storage.cpp
@@ -179,7 +179,7 @@ BOOST_AUTO_TEST_CASE(construction)
     {
         const auto                              p_input_stream = create_input_stream();
         const tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::string>string_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::string> string_deserializer{ false };
             return string_deserializer(std::string{ std::begin(serialized), std::end(serialized) });
         } };
         const tetengo::trie::memory_storage storage_{ *p_input_stream, deserializer };
@@ -195,7 +195,7 @@ BOOST_AUTO_TEST_CASE(construction)
     {
         const auto                              p_input_stream = create_input_stream_fixed_value_size();
         const tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::memory_storage storage_{ *p_input_stream, deserializer };
@@ -212,7 +212,7 @@ BOOST_AUTO_TEST_CASE(construction)
         const auto p_input_stream = create_broken_input_stream();
 
         const tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::string>string_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::string> string_deserializer{ false };
             return string_deserializer(std::string{ std::begin(serialized), std::end(serialized) });
         } };
         BOOST_CHECK_THROW(
diff --git a/library/trie/test/src/test_tetengo.trie.mmap_storage.cpp b/library/trie/test/src/test_tetengo.trie.mmap_storage.cpp
index 8e0c203a..1e67c1cd 100644
--- a/library/trie/test/src/test_tetengo.trie.mmap_storage.cpp
+++ b/library/trie/test/src/test_tetengo.trie.mmap_storage.cpp
@@ -11,9 +11,9 @@
 #include <filesystem>
 #include <fstream>
 #include <functional>
-#include <ios>
 #include <iterator>
 #include <memory>
+#include <sstream>
 #include <stdexcept>
 #include <utility>
 #include <vector>
@@ -242,7 +242,7 @@ BOOST_AUTO_TEST_CASE(construction)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -258,7 +258,7 @@ BOOST_AUTO_TEST_CASE(construction)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 5, file_size, std::move(deserializer) };
@@ -274,7 +274,7 @@ BOOST_AUTO_TEST_CASE(construction)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         BOOST_CHECK_THROW(
@@ -292,7 +292,7 @@ BOOST_AUTO_TEST_CASE(construction)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         BOOST_CHECK_THROW(
@@ -310,7 +310,7 @@ BOOST_AUTO_TEST_CASE(construction)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         BOOST_CHECK_THROW(
@@ -404,7 +404,7 @@ BOOST_AUTO_TEST_CASE(base_check_size)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -422,7 +422,7 @@ BOOST_AUTO_TEST_CASE(base_check_size)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 5, file_size, std::move(deserializer) };
@@ -486,7 +486,7 @@ BOOST_AUTO_TEST_CASE(base_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -505,7 +505,7 @@ BOOST_AUTO_TEST_CASE(base_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 5, file_size, std::move(deserializer) };
@@ -621,7 +621,7 @@ BOOST_AUTO_TEST_CASE(set_base_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -685,7 +685,7 @@ BOOST_AUTO_TEST_CASE(check_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -704,7 +704,7 @@ BOOST_AUTO_TEST_CASE(check_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 5, file_size, std::move(deserializer) };
@@ -801,7 +801,7 @@ BOOST_AUTO_TEST_CASE(set_check_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -847,7 +847,7 @@ BOOST_AUTO_TEST_CASE(value_count)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -865,7 +865,7 @@ BOOST_AUTO_TEST_CASE(value_count)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 5, file_size, std::move(deserializer) };
@@ -929,7 +929,7 @@ BOOST_AUTO_TEST_CASE(value_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -954,7 +954,7 @@ BOOST_AUTO_TEST_CASE(value_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 5, file_size, std::move(deserializer) };
@@ -1051,7 +1051,7 @@ BOOST_AUTO_TEST_CASE(add_value_at)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -1117,7 +1117,7 @@ BOOST_AUTO_TEST_CASE(filling_rate)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -1163,7 +1163,7 @@ BOOST_AUTO_TEST_CASE(serialize)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -1234,7 +1234,7 @@ BOOST_AUTO_TEST_CASE(clone)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 0, file_size, std::move(deserializer) };
@@ -1255,7 +1255,7 @@ BOOST_AUTO_TEST_CASE(clone)
         const boost::interprocess::file_mapping file_mapping{ file_path.c_str(), boost::interprocess::read_only };
         const auto                        file_size = static_cast<std::size_t>(std::filesystem::file_size(file_path));
         tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::uint32_t>uint32_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::uint32_t> uint32_deserializer{ false };
             return uint32_deserializer(serialized);
         } };
         const tetengo::trie::mmap_storage storage{ file_mapping, 5, file_size, std::move(deserializer) };
diff --git a/library/trie/test/src/test_tetengo.trie.shared_storage.cpp b/library/trie/test/src/test_tetengo.trie.shared_storage.cpp
index 557e9ddc..9cee33ea 100644
--- a/library/trie/test/src/test_tetengo.trie.shared_storage.cpp
+++ b/library/trie/test/src/test_tetengo.trie.shared_storage.cpp
@@ -169,7 +169,7 @@ BOOST_AUTO_TEST_CASE(construction)
     {
         const auto                              p_input_stream = create_input_stream();
         const tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::string>string_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::string> string_deserializer{ false };
             return string_deserializer(std::string{ std::begin(serialized), std::end(serialized) });
         } };
         const tetengo::trie::shared_storage storage_{ *p_input_stream, deserializer };
@@ -186,7 +186,7 @@ BOOST_AUTO_TEST_CASE(construction)
         const auto p_input_stream = create_broken_input_stream();
 
         const tetengo::trie::value_deserializer deserializer{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::string>string_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::string> string_deserializer{ false };
             return string_deserializer(std::string{ std::begin(serialized), std::end(serialized) });
         } };
         BOOST_CHECK_THROW(
diff --git a/library/trie/test/src/test_tetengo.trie.trie.cpp b/library/trie/test/src/test_tetengo.trie.trie.cpp
index f7440e3e..93669ed1 100644
--- a/library/trie/test/src/test_tetengo.trie.trie.cpp
+++ b/library/trie/test/src/test_tetengo.trie.trie.cpp
@@ -270,12 +270,12 @@ BOOST_AUTO_TEST_CASE(construction)
     }
     {
         std::vector<std::pair<std::string_view, std::string>>    content{ { "Kumamoto", kumamoto1 },
-                                                                       { "Tamana", tamana1 } };
+                                                                          { "Tamana", tamana1 } };
         const tetengo::trie::trie<std::string_view, std::string> trie_{ std::begin(content), std::end(content) };
     }
     {
         std::vector<std::pair<std::string_view, std::string>>    content{ { "Kumamoto", kumamoto1 },
-                                                                       { "Tamana", tamana1 } };
+                                                                          { "Tamana", tamana1 } };
         const tetengo::trie::trie<std::string_view, std::string> trie_{ std::make_move_iterator(std::begin(content)),
                                                                         std::make_move_iterator(std::end(content)) };
     }
@@ -288,7 +288,7 @@ BOOST_AUTO_TEST_CASE(construction)
     {
         auto                                    p_input_stream = create_input_stream();
         const tetengo::trie::value_deserializer value_deserializer_{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::string>string_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::string> string_deserializer{ false };
             return string_deserializer(std::string{ std::begin(serialized), std::end(serialized) });
         } };
         auto p_storage = std::make_unique<tetengo::trie::memory_storage>(*p_input_stream, value_deserializer_);
@@ -297,7 +297,7 @@ BOOST_AUTO_TEST_CASE(construction)
     {
         auto                                    p_input_stream = create_input_stream();
         const tetengo::trie::value_deserializer value_deserializer_{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::string>string_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::string> string_deserializer{ false };
             return string_deserializer(std::string{ std::begin(serialized), std::end(serialized) });
         } };
         auto p_storage = std::make_unique<tetengo::trie::memory_storage>(*p_input_stream, value_deserializer_);
@@ -503,7 +503,7 @@ BOOST_AUTO_TEST_CASE(empty)
     }
     {
         std::vector<std::pair<std::string_view, std::string>>    content{ { "Kumamoto", kumamoto1 },
-                                                                       { "Tamana", tamana1 } };
+                                                                          { "Tamana", tamana1 } };
         const tetengo::trie::trie<std::string_view, std::string> trie_{ std::make_move_iterator(std::begin(content)),
                                                                         std::make_move_iterator(std::end(content)) };
 
@@ -596,7 +596,7 @@ BOOST_AUTO_TEST_CASE(size)
     }
     {
         std::vector<std::pair<std::string_view, std::string>>    content{ { "Kumamoto", kumamoto1 },
-                                                                       { "Tamana", tamana1 } };
+                                                                          { "Tamana", tamana1 } };
         const tetengo::trie::trie<std::string_view, std::string> trie_{ std::make_move_iterator(std::begin(content)),
                                                                         std::make_move_iterator(std::end(content)) };
 
@@ -712,7 +712,7 @@ BOOST_AUTO_TEST_CASE(contains)
     }
     {
         std::vector<std::pair<std::string_view, std::string>>    content{ { "Kumamoto", kumamoto1 },
-                                                                       { "Tamana", tamana1 } };
+                                                                          { "Tamana", tamana1 } };
         const tetengo::trie::trie<std::string_view, std::string> trie_{ std::make_move_iterator(std::begin(content)),
                                                                         std::make_move_iterator(std::end(content)) };
 
@@ -848,7 +848,7 @@ BOOST_AUTO_TEST_CASE(find)
     }
     {
         std::vector<std::pair<std::string_view, std::string>>    content{ { "Kumamoto", kumamoto1 },
-                                                                       { "Tamana", tamana1 } };
+                                                                          { "Tamana", tamana1 } };
         const tetengo::trie::trie<std::string_view, std::string> trie_{ std::make_move_iterator(std::begin(content)),
                                                                         std::make_move_iterator(std::end(content)) };
 
@@ -971,7 +971,7 @@ BOOST_AUTO_TEST_CASE(begin_end)
     }
     {
         std::vector<std::pair<std::string_view, std::string>>    content{ { "Kumamoto", kumamoto1 },
-                                                                       { "Tamana", tamana1 } };
+                                                                          { "Tamana", tamana1 } };
         const tetengo::trie::trie<std::string_view, std::string> trie_{ std::make_move_iterator(std::begin(content)),
                                                                         std::make_move_iterator(std::end(content)) };
 
@@ -1124,7 +1124,7 @@ BOOST_AUTO_TEST_CASE(subtrie)
     }
     {
         std::vector<std::pair<std::string_view, std::string>>    content{ { "Kumamoto", kumamoto1 },
-                                                                       { "Tamana", tamana1 } };
+                                                                          { "Tamana", tamana1 } };
         const tetengo::trie::trie<std::string_view, std::string> trie_{ std::make_move_iterator(std::begin(content)),
                                                                         std::make_move_iterator(std::end(content)) };
 
@@ -1249,7 +1249,7 @@ BOOST_AUTO_TEST_CASE(get_storage)
     {
         auto                                    p_input_stream = create_input_stream();
         const tetengo::trie::value_deserializer value_deserializer_{ [](const std::vector<char>& serialized) {
-            static const tetengo::trie::default_deserializer<std::string>string_deserializer{ false };
+            static const tetengo::trie::default_deserializer<std::string> string_deserializer{ false };
             return string_deserializer(std::string{ std::begin(serialized), std::end(serialized) });
         } };
         auto p_storage = std::make_unique<tetengo::trie::memory_storage>(*p_input_stream, value_deserializer_);
diff --git a/library/trie/test/src/test_tetengo.trie.value_serializer.cpp b/library/trie/test/src/test_tetengo.trie.value_serializer.cpp
index fc31eab5..2041a332 100644
--- a/library/trie/test/src/test_tetengo.trie.value_serializer.cpp
+++ b/library/trie/test/src/test_tetengo.trie.value_serializer.cpp
@@ -33,9 +33,7 @@ BOOST_AUTO_TEST_CASE(construction)
                                                           sizeof(int) };
     }
     {
-        const tetengo::trie::value_serializer serializer{ [](const std::any&) {
-                                                             return std::vector<char>{ 3, 1, 4 };
-                                                         },
+        const tetengo::trie::value_serializer serializer{ [](const std::any&) { return std::vector<char>{ 3, 1, 4 }; },
                                                           0 };
     }
 }
@@ -56,9 +54,7 @@ BOOST_AUTO_TEST_CASE(operator_paren)
         BOOST_TEST(serialized == expected);
     }
     {
-        const tetengo::trie::value_serializer serializer{ [](const std::any&) {
-                                                             return std::vector<char>{ 3, 1, 4 };
-                                                         },
+        const tetengo::trie::value_serializer serializer{ [](const std::any&) { return std::vector<char>{ 3, 1, 4 }; },
                                                           0 };
 
         const auto expected = std::vector<char>{ 3, 1, 4 };
@@ -81,9 +77,7 @@ BOOST_AUTO_TEST_CASE(fixed_value_size)
         BOOST_TEST(serializer.fixed_value_size() == sizeof(int));
     }
     {
-        const tetengo::trie::value_serializer serializer{ [](const std::any&) {
-                                                             return std::vector<char>{ 3, 1, 4 };
-                                                         },
+        const tetengo::trie::value_serializer serializer{ [](const std::any&) { return std::vector<char>{ 3, 1, 4 }; },
                                                           0 };
 
         BOOST_TEST(serializer.fixed_value_size() == 0U);
diff --git a/library/trie/test/src/usage_tetengo.trie.search_c.c b/library/trie/test/src/usage_tetengo.trie.search_c.c
index 9a235250..4b284c19 100644
--- a/library/trie/test/src/usage_tetengo.trie.search_c.c
+++ b/library/trie/test/src/usage_tetengo.trie.search_c.c
@@ -25,7 +25,7 @@ static void done_observer(void* const p_context)
     strcat((char*)p_context, "DONE");
 }
 
-void usage_tetengo_trie_search()
+void usage_tetengo_trie_search(void)
 {
     // Prepares initial elements.
     const int initial_values[] = {
diff --git a/library/trie/test/src/usage_tetengo.trie.search_c.h b/library/trie/test/src/usage_tetengo.trie.search_c.h
index 99002c95..2c47ba3e 100644
--- a/library/trie/test/src/usage_tetengo.trie.search_c.h
+++ b/library/trie/test/src/usage_tetengo.trie.search_c.h
@@ -13,7 +13,7 @@
 extern "C" {
 #endif
 
-void usage_tetengo_trie_search();
+void usage_tetengo_trie_search(void);
 
 
 #if defined(__cplusplus)
diff --git a/library/trie/test/src/usage_tetengo.trie.search_cpp.cpp b/library/trie/test/src/usage_tetengo.trie.search_cpp.cpp
index 5947286d..8b5d1900 100644
--- a/library/trie/test/src/usage_tetengo.trie.search_cpp.cpp
+++ b/library/trie/test/src/usage_tetengo.trie.search_cpp.cpp
@@ -14,6 +14,7 @@
 #include <memory>
 #include <string>
 #include <string_view>
+#include <utility> // IWYU pragma: keep
 #include <vector>
 
 #include <boost/stl_interfaces/iterator_interface.hpp> // IWYU pragma: keep
diff --git a/library/trie/test/test_tetengo.trie.vcxproj b/library/trie/test/test_tetengo.trie.vcxproj
index c985b22d..7beb9a5e 100644
--- a/library/trie/test/test_tetengo.trie.vcxproj
+++ b/library/trie/test/test_tetengo.trie.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/sample/json2timetable/json2timetable.vcxproj b/sample/json2timetable/json2timetable.vcxproj
index a76efa03..ce013f5e 100644
--- a/sample/json2timetable/json2timetable.vcxproj
+++ b/sample/json2timetable/json2timetable.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/sample/json2timetable/src/encode.c b/sample/json2timetable/src/encode.c
index 6af196a0..3eb94378 100644
--- a/sample/json2timetable/src/encode.c
+++ b/sample/json2timetable/src/encode.c
@@ -14,7 +14,7 @@
 #include <tetengo/text/encoder.h>
 
 
-static tetengo_text_encoder_encoding_t select_encoding()
+static tetengo_text_encoder_encoding_t select_encoding(void)
 {
     const char* const locale = setlocale(LC_CTYPE, NULL);
     if (locale && strcmp(locale, "Japanese_Japan.932") == 0)
diff --git a/sample/json2timetable/src/printStationTimetable.c b/sample/json2timetable/src/printStationTimetable.c
index ce0ccbc9..7a1bd622 100644
--- a/sample/json2timetable/src/printStationTimetable.c
+++ b/sample/json2timetable/src/printStationTimetable.c
@@ -48,7 +48,7 @@ static void destroy_string(const void* const p_departure)
     free((void*)p_departure);
 }
 
-static const arrayList_t* create_departure_list()
+static const arrayList_t* create_departure_list(void)
 {
     arrayList_t* const p_departure_list = arrayList_create(destroy_string);
     return p_departure_list;
diff --git a/sample/make_dict/make_dict.vcxproj b/sample/make_dict/make_dict.vcxproj
index b103d8ab..f2c2d265 100644
--- a/sample/make_dict/make_dict.vcxproj
+++ b/sample/make_dict/make_dict.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/sample/search_dict/search_dict.vcxproj b/sample/search_dict/search_dict.vcxproj
index 83514149..a0448a6e 100644
--- a/sample/search_dict/search_dict.vcxproj
+++ b/sample/search_dict/search_dict.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/sample/search_dict_c/search_dict_c.vcxproj b/sample/search_dict_c/search_dict_c.vcxproj
index cdcbecdf..1cde8e75 100644
--- a/sample/search_dict_c/search_dict_c.vcxproj
+++ b/sample/search_dict_c/search_dict_c.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/sample/search_dict_c/src/main.c b/sample/search_dict_c/src/main.c
index af268b80..658d9dd7 100644
--- a/sample/search_dict_c/src/main.c
+++ b/sample/search_dict_c/src/main.c
@@ -174,7 +174,7 @@ static void to_array_of_lex_span(
     }
 }
 
-static tetengo_text_encoder_encoding_t select_encoding()
+static tetengo_text_encoder_encoding_t select_encoding(void)
 {
     const char* const locale = setlocale(LC_CTYPE, NULL);
     if (locale && strcmp(locale, "Japanese_Japan.932") == 0)
diff --git a/sample/transfer_trains/src/timetable.cpp b/sample/transfer_trains/src/timetable.cpp
index cd77d6c4..ce454748 100644
--- a/sample/transfer_trains/src/timetable.cpp
+++ b/sample/transfer_trains/src/timetable.cpp
@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <any>
 #include <cassert>
+#include <functional> // IWYU pragma: keep
 #include <istream>
 #include <iterator>
 #include <limits>
diff --git a/sample/transfer_trains/transfer_trains.vcxproj b/sample/transfer_trains/transfer_trains.vcxproj
index 5473c29d..289e3f70 100644
--- a/sample/transfer_trains/transfer_trains.vcxproj
+++ b/sample/transfer_trains/transfer_trains.vcxproj
@@ -29,27 +29,27 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/setup/installer/Makefile.nmake b/setup/installer/Makefile.nmake
index 0a6c5dd8..547c9cbe 100644
--- a/setup/installer/Makefile.nmake
+++ b/setup/installer/Makefile.nmake
@@ -33,21 +33,21 @@ $(BINDIR)\tetengo.msi: $(OBJDIR)\tetengo.en.msi $(OBJDIR)\ja.mst
 	$(COPY) /y $(OBJDIR)\tetengo.msi $@
 
 $(OBJDIR)\ja.mst: $(OBJDIR)\tetengo.en.msi $(OBJDIR)\tetengo.ja.msi
-	$(WIXCOMMAND) msi transform -out $@ -p -t language $**
+	$(WIXCOMMAND) msi -acceptEula wix7 transform -out $@ -p -t language $**
 
 $(OBJDIR)\tetengo.en.msi: $(WORKDIR)\main.wxs $(OBJDIR)\content.wxs
 	set WORKDIR=$(WORKDIR)
 	set PLATFORM=$(PLATFORM)
 	set LANGUAGE=1033
 	set CODEPAGE=1252
-	$(WIXCOMMAND) build -out $@ -ext WixToolset.UI.wixext -arch $(ARCH) -culture en-US $**
+	$(WIXCOMMAND) build -acceptEula wix7 -out $@ -ext WixToolset.UI.wixext -arch $(ARCH) -culture en-US $**
 
 $(OBJDIR)\tetengo.ja.msi: $(WORKDIR)\main.wxs $(OBJDIR)\content.wxs
 	set WORKDIR=$(WORKDIR)
 	set PLATFORM=$(PLATFORM)
 	set LANGUAGE=1041
 	set CODEPAGE=932
-	$(WIXCOMMAND) build -out $@ -ext WixToolset.UI.wixext -arch $(ARCH) -culture ja-JP $**
+	$(WIXCOMMAND) build -acceptEula wix7 -out $@ -ext WixToolset.UI.wixext -arch $(ARCH) -culture ja-JP $**
 
 $(OBJDIR)\content.wxs: $(OBJDIR)\content_wxs_source.txt
 	$(PYTHON) "$(WORKDIR)\generate_content_wxs.py" $** $@
diff --git a/setup/installer/copy_libimage_files.py b/setup/installer/copy_libimage_files.py
index 3e719b13..d2ad71e0 100644
--- a/setup/installer/copy_libimage_files.py
+++ b/setup/installer/copy_libimage_files.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 """Copies the files for a library image
 
-    Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
+Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 """
 
 import re
diff --git a/setup/installer/generate_content_wxs.py b/setup/installer/generate_content_wxs.py
index 4e17f302..b403e200 100644
--- a/setup/installer/generate_content_wxs.py
+++ b/setup/installer/generate_content_wxs.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 """Generates content.wxs source
 
-    Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
+Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 """
 
 import io
diff --git a/setup/installer/generate_content_wxs_source.py b/setup/installer/generate_content_wxs_source.py
index 4de80d54..2e14b6b6 100644
--- a/setup/installer/generate_content_wxs_source.py
+++ b/setup/installer/generate_content_wxs_source.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 """Generates content.wxs source
 
-    Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
+Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 """
 
 import glob
diff --git a/setup/installer/installer.vcxproj b/setup/installer/installer.vcxproj
index 1a4a51ed..5d27b131 100644
--- a/setup/installer/installer.vcxproj
+++ b/setup/installer/installer.vcxproj
@@ -27,22 +27,22 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Makefile</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>v145</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/tetengo.setup.sln b/tetengo.setup.sln
deleted file mode 100644
index d43de19c..00000000
--- a/tetengo.setup.sln
+++ /dev/null
@@ -1,31 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.0.31912.275
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "installer", "setup\installer\installer.vcxproj", "{CC786CA7-FA79-4F28-B59B-FF76BE47992F}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|x64 = Debug|x64
-		Debug|x86 = Debug|x86
-		Release|x64 = Release|x64
-		Release|x86 = Release|x86
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{CC786CA7-FA79-4F28-B59B-FF76BE47992F}.Debug|x64.ActiveCfg = Debug|x64
-		{CC786CA7-FA79-4F28-B59B-FF76BE47992F}.Debug|x64.Build.0 = Debug|x64
-		{CC786CA7-FA79-4F28-B59B-FF76BE47992F}.Debug|x86.ActiveCfg = Debug|Win32
-		{CC786CA7-FA79-4F28-B59B-FF76BE47992F}.Debug|x86.Build.0 = Debug|Win32
-		{CC786CA7-FA79-4F28-B59B-FF76BE47992F}.Release|x64.ActiveCfg = Release|x64
-		{CC786CA7-FA79-4F28-B59B-FF76BE47992F}.Release|x64.Build.0 = Release|x64
-		{CC786CA7-FA79-4F28-B59B-FF76BE47992F}.Release|x86.ActiveCfg = Release|Win32
-		{CC786CA7-FA79-4F28-B59B-FF76BE47992F}.Release|x86.Build.0 = Release|Win32
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {9527DCE0-6C5B-48C9-8B7F-A8EE9EE7FB29}
-	EndGlobalSection
-EndGlobal
diff --git a/tetengo.setup.slnx b/tetengo.setup.slnx
new file mode 100644
index 00000000..3b818d90
--- /dev/null
+++ b/tetengo.setup.slnx
@@ -0,0 +1,7 @@
+<Solution>
+  <Configurations>
+    <Platform Name="x64" />
+    <Platform Name="x86" />
+  </Configurations>
+  <Project Path="setup/installer/installer.vcxproj" Id="cc786ca7-fa79-4f28-b59b-ff76be47992f" />
+</Solution>
diff --git a/tetengo.sln b/tetengo.sln
deleted file mode 100644
index b5842c02..00000000
--- a/tetengo.sln
+++ /dev/null
@@ -1,300 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.0.31912.275
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "trie", "trie", "{61A0CE42-96A0-4578-A035-17D62CE4A691}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "library", "library", "{43A6A26D-0B13-4B60-9DBD-6113E56F9E76}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "sample", "sample", "{721A442D-34D8-457A-8D07-D21EB2C6A04C}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "search_dict", "sample\search_dict\search_dict.vcxproj", "{15803B5C-8845-4325-819B-B09E40B8826E}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "make_dict", "sample\make_dict\make_dict.vcxproj", "{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.trie", "library\trie\c\tetengo.trie.vcxproj", "{E14D072F-631B-4E87-BC03-57437306CD34}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.trie.cpp", "library\trie\cpp\tetengo.trie.cpp.vcxproj", "{A755F6BF-9964-4608-A0C8-9F7557D14A09}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_tetengo.trie", "library\trie\test\test_tetengo.trie.vcxproj", "{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "search_dict_c", "sample\search_dict_c\search_dict_c.vcxproj", "{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "lattice", "lattice", "{983DE5D9-732F-4E41-87C5-EF551498AD47}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.lattice", "library\lattice\c\tetengo.lattice.vcxproj", "{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.lattice.cpp", "library\lattice\cpp\tetengo.lattice.cpp.vcxproj", "{65C6D977-AC51-4E28-8B15-178FBDF69168}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_tetengo.lattice", "library\lattice\test\test_tetengo.lattice.vcxproj", "{3FED617D-365B-4DEA-ACC0-21A60741EBD3}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "transfer_trains", "sample\transfer_trains\transfer_trains.vcxproj", "{8B106CC4-B645-4A2B-9807-38C8D185D40A}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "json", "json", "{796F44F5-AAB1-4E90-98BF-FC60F7FD8E08}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.json", "library\json\c\tetengo.json.vcxproj", "{6A37648E-2203-4052-91DF-B8F2B2C26A04}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.json.cpp", "library\json\cpp\tetengo.json.cpp.vcxproj", "{CBA672B4-259E-4BD2-9072-1D34CF941D4C}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_tetengo.json", "library\json\test\test_tetengo.json.vcxproj", "{0AAF49D5-D4FE-4CDA-BBC3-A1CDC25F8816}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "text", "text", "{8025EE35-4F98-4CBA-8D82-E8D21E6BCB0F}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_tetengo.text", "library\text\test\test_tetengo.text.vcxproj", "{52ACD25C-C27C-475C-9E47-46A24719B163}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.text", "library\text\c\tetengo.text.vcxproj", "{49971358-A731-4C16-943A-C66735F3B342}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.text.cpp", "library\text\cpp\tetengo.text.cpp.vcxproj", "{BE228A1E-25D5-4825-89B4-C3513F1DC559}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "json2timetable", "sample\json2timetable\json2timetable.vcxproj", "{EB5E3C27-4233-4BB2-A64A-66962EB663AD}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "platform_dependent", "platform_dependent", "{C7B68D75-9EFA-4708-B4DA-A8473357579D}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.platform_dependent.cpp", "library\platform_dependent\cpp\tetengo.platform_dependent.cpp.vcxproj", "{3AAEA971-DC2B-40D6-830C-B0D6A3368A7A}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_tetengo.platform_dependent", "library\platform_dependent\test\test_tetengo.platform_dependent.vcxproj", "{3C7661CA-2B8C-47A6-A722-FC9DDE182425}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "executable", "executable", "{9D13BF98-E8F1-46C7-881F-881EECC4DAEB}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "setup", "executable\setup\setup.vcxproj", "{5CDC9199-A26F-4204-91AD-E90C8C21697A}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "property", "property", "{54A96989-C898-4938-8848-1D1B6D9E99C1}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.property", "library\property\c\tetengo.property.vcxproj", "{21380636-4355-4AED-8A76-8B6A9FBA5650}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "tetengo.property.cpp", "library\property\cpp\tetengo.property.cpp.vcxproj", "{4356FF6A-22D4-4835-8321-145998F26D68}"
-EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_tetengo.property", "library\property\test\test_tetengo.property.vcxproj", "{770BC269-B483-424A-BF64-ADC43D81F5BE}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|x64 = Debug|x64
-		Debug|x86 = Debug|x86
-		Release|x64 = Release|x64
-		Release|x86 = Release|x86
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{15803B5C-8845-4325-819B-B09E40B8826E}.Debug|x64.ActiveCfg = Debug|x64
-		{15803B5C-8845-4325-819B-B09E40B8826E}.Debug|x64.Build.0 = Debug|x64
-		{15803B5C-8845-4325-819B-B09E40B8826E}.Debug|x86.ActiveCfg = Debug|Win32
-		{15803B5C-8845-4325-819B-B09E40B8826E}.Debug|x86.Build.0 = Debug|Win32
-		{15803B5C-8845-4325-819B-B09E40B8826E}.Release|x64.ActiveCfg = Release|x64
-		{15803B5C-8845-4325-819B-B09E40B8826E}.Release|x64.Build.0 = Release|x64
-		{15803B5C-8845-4325-819B-B09E40B8826E}.Release|x86.ActiveCfg = Release|Win32
-		{15803B5C-8845-4325-819B-B09E40B8826E}.Release|x86.Build.0 = Release|Win32
-		{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}.Debug|x64.ActiveCfg = Debug|x64
-		{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}.Debug|x64.Build.0 = Debug|x64
-		{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}.Debug|x86.ActiveCfg = Debug|Win32
-		{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}.Debug|x86.Build.0 = Debug|Win32
-		{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}.Release|x64.ActiveCfg = Release|x64
-		{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}.Release|x64.Build.0 = Release|x64
-		{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}.Release|x86.ActiveCfg = Release|Win32
-		{D23815A4-4916-4C12-8DFA-CF6F4A8E51BB}.Release|x86.Build.0 = Release|Win32
-		{E14D072F-631B-4E87-BC03-57437306CD34}.Debug|x64.ActiveCfg = Debug|x64
-		{E14D072F-631B-4E87-BC03-57437306CD34}.Debug|x64.Build.0 = Debug|x64
-		{E14D072F-631B-4E87-BC03-57437306CD34}.Debug|x86.ActiveCfg = Debug|Win32
-		{E14D072F-631B-4E87-BC03-57437306CD34}.Debug|x86.Build.0 = Debug|Win32
-		{E14D072F-631B-4E87-BC03-57437306CD34}.Release|x64.ActiveCfg = Release|x64
-		{E14D072F-631B-4E87-BC03-57437306CD34}.Release|x64.Build.0 = Release|x64
-		{E14D072F-631B-4E87-BC03-57437306CD34}.Release|x86.ActiveCfg = Release|Win32
-		{E14D072F-631B-4E87-BC03-57437306CD34}.Release|x86.Build.0 = Release|Win32
-		{A755F6BF-9964-4608-A0C8-9F7557D14A09}.Debug|x64.ActiveCfg = Debug|x64
-		{A755F6BF-9964-4608-A0C8-9F7557D14A09}.Debug|x64.Build.0 = Debug|x64
-		{A755F6BF-9964-4608-A0C8-9F7557D14A09}.Debug|x86.ActiveCfg = Debug|Win32
-		{A755F6BF-9964-4608-A0C8-9F7557D14A09}.Debug|x86.Build.0 = Debug|Win32
-		{A755F6BF-9964-4608-A0C8-9F7557D14A09}.Release|x64.ActiveCfg = Release|x64
-		{A755F6BF-9964-4608-A0C8-9F7557D14A09}.Release|x64.Build.0 = Release|x64
-		{A755F6BF-9964-4608-A0C8-9F7557D14A09}.Release|x86.ActiveCfg = Release|Win32
-		{A755F6BF-9964-4608-A0C8-9F7557D14A09}.Release|x86.Build.0 = Release|Win32
-		{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}.Debug|x64.ActiveCfg = Debug|x64
-		{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}.Debug|x64.Build.0 = Debug|x64
-		{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}.Debug|x86.ActiveCfg = Debug|Win32
-		{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}.Debug|x86.Build.0 = Debug|Win32
-		{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}.Release|x64.ActiveCfg = Release|x64
-		{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}.Release|x64.Build.0 = Release|x64
-		{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}.Release|x86.ActiveCfg = Release|Win32
-		{584C5F3E-3956-4BC8-A1F7-6A8A09EDFDFB}.Release|x86.Build.0 = Release|Win32
-		{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}.Debug|x64.ActiveCfg = Debug|x64
-		{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}.Debug|x64.Build.0 = Debug|x64
-		{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}.Debug|x86.ActiveCfg = Debug|Win32
-		{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}.Debug|x86.Build.0 = Debug|Win32
-		{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}.Release|x64.ActiveCfg = Release|x64
-		{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}.Release|x64.Build.0 = Release|x64
-		{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}.Release|x86.ActiveCfg = Release|Win32
-		{6287FA8D-837B-4ADC-9DBB-5A7CF18F9546}.Release|x86.Build.0 = Release|Win32
-		{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}.Debug|x64.ActiveCfg = Debug|x64
-		{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}.Debug|x64.Build.0 = Debug|x64
-		{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}.Debug|x86.ActiveCfg = Debug|Win32
-		{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}.Debug|x86.Build.0 = Debug|Win32
-		{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}.Release|x64.ActiveCfg = Release|x64
-		{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}.Release|x64.Build.0 = Release|x64
-		{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}.Release|x86.ActiveCfg = Release|Win32
-		{2EE3983D-A0E0-429F-BC2F-5D46C93E1C81}.Release|x86.Build.0 = Release|Win32
-		{65C6D977-AC51-4E28-8B15-178FBDF69168}.Debug|x64.ActiveCfg = Debug|x64
-		{65C6D977-AC51-4E28-8B15-178FBDF69168}.Debug|x64.Build.0 = Debug|x64
-		{65C6D977-AC51-4E28-8B15-178FBDF69168}.Debug|x86.ActiveCfg = Debug|Win32
-		{65C6D977-AC51-4E28-8B15-178FBDF69168}.Debug|x86.Build.0 = Debug|Win32
-		{65C6D977-AC51-4E28-8B15-178FBDF69168}.Release|x64.ActiveCfg = Release|x64
-		{65C6D977-AC51-4E28-8B15-178FBDF69168}.Release|x64.Build.0 = Release|x64
-		{65C6D977-AC51-4E28-8B15-178FBDF69168}.Release|x86.ActiveCfg = Release|Win32
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diff --git a/tetengo.slnx b/tetengo.slnx
new file mode 100644
index 00000000..6c37fc55
--- /dev/null
+++ b/tetengo.slnx
@@ -0,0 +1,46 @@
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+  </Folder>
+  <Folder Name="/library/trie/">
+    <Project Path="library/trie/c/tetengo.trie.vcxproj" Id="e14d072f-631b-4e87-bc03-57437306cd34" />
+    <Project Path="library/trie/cpp/tetengo.trie.cpp.vcxproj" Id="a755f6bf-9964-4608-a0c8-9f7557d14a09" />
+    <Project Path="library/trie/test/test_tetengo.trie.vcxproj" Id="584c5f3e-3956-4bc8-a1f7-6a8a09edfdfb" />
+  </Folder>
+  <Folder Name="/sample/">
+    <Project Path="sample/json2timetable/json2timetable.vcxproj" Id="eb5e3c27-4233-4bb2-a64a-66962eb663ad" />
+    <Project Path="sample/make_dict/make_dict.vcxproj" Id="d23815a4-4916-4c12-8dfa-cf6f4a8e51bb" />
+    <Project Path="sample/search_dict/search_dict.vcxproj" Id="15803b5c-8845-4325-819b-b09e40b8826e" />
+    <Project Path="sample/search_dict_c/search_dict_c.vcxproj" Id="6287fa8d-837b-4adc-9dbb-5a7cf18f9546" />
+    <Project Path="sample/transfer_trains/transfer_trains.vcxproj" Id="8b106cc4-b645-4a2b-9807-38c8d185d40a" />
+  </Folder>
+</Solution>
diff --git a/tool/make_character_property_map.py b/tool/make_character_property_map.py
index c49cac76..ebb6f3d5 100644
--- a/tool/make_character_property_map.py
+++ b/tool/make_character_property_map.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 """Makes character_property_map.txt for tetengo::text
 
-    Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
+Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 """
 
 import re
diff --git a/tool/make_character_property_map_cpp.py b/tool/make_character_property_map_cpp.py
index 486afc0d..58a9752f 100644
--- a/tool/make_character_property_map_cpp.py
+++ b/tool/make_character_property_map_cpp.py
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 """Makes character_property_map.txt for tetengo::text
 
-    Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
+Copyright (C) 2019-2026 kaoru  https://www.tetengo.org/
 """
 
 import sys