samples/windll: print_answer in plugin, remove copyright notices

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jll63

samples/windll/CMakeLists.txt

@@ -1,13 +1,10 @@
-# Copyright (c) 2018-2025 Jean-Louis Leroy
-# Distributed under the Boost Software License, Version 1.0.
-# See accompanying file LICENSE_1_0.txt
-# or copy at http://www.boost.org/LICENSE_1_0.txt)
-
 # Illustrates the dllvar technique: the exe owns (exports) a variable; the
 # DLL imports it. Both see static_answer<answer_dllvar, void>::value as the
 # same linker symbol because the varying base class does not enter the mangled
 # name; SFINAE selects dllexport in the owner and dllimport in the client.
 
+cmake_minimum_required(VERSION 4.2)
+
 if (NOT (WIN32 OR CYGWIN))
     return()
 endif()

samples/windll/main.cpp

@@ -1,8 +1,3 @@
-// Copyright (c) 2018-2025 Jean-Louis Leroy
-// Distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE_1_0.txt
-// or copy at http://www.boost.org/LICENSE_1_0.txt)
-
 // Owner: answer_dllvar derives from dllexport_tag here.
 #define WINDLL_OWNER
 #include "shared.hpp"
@@ -13,8 +8,9 @@ int main() {
     answer() = 42;
     auto plugin = LoadLibraryA("windll_plugin.dll");
     assert(plugin);
-    auto get_answer = reinterpret_cast<int(*)()>(
-        GetProcAddress(plugin, "get_answer"));
-    assert(get_answer() == 42);
+    auto print_answer = reinterpret_cast<void(*)()>(
+        GetProcAddress(plugin, "print_answer"));
+    assert(print_answer);
+    print_answer(); // prints "answer = 42"
     FreeLibrary(plugin);
 }

samples/windll/plugin.cpp

@@ -1,11 +1,7 @@
-// Copyright (c) 2018-2025 Jean-Louis Leroy
-// Distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE_1_0.txt
-// or copy at http://www.boost.org/LICENSE_1_0.txt)
-
 // Client: answer_dllvar derives from dllimport_tag here (no WINDLL_OWNER).
 #include "shared.hpp"
+#include <cstdio>
 
-// answer() returns a reference to static_answer<answer_dllvar, void>::value —
-// the one shared linker symbol — bound via dllimport.
-extern "C" __declspec(dllexport) int get_answer() { return answer(); }
+extern "C" __declspec(dllexport) void print_answer() {
+    printf("answer = %d\n", answer());
+}

samples/windll/shared.hpp

@@ -1,8 +1,3 @@
-// Copyright (c) 2018-2025 Jean-Louis Leroy
-// Distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE_1_0.txt
-// or copy at http://www.boost.org/LICENSE_1_0.txt)
-
 #pragma once
 #include <type_traits>
 
@@ -48,6 +43,4 @@ struct static_answer<Tag,
     static __declspec(dllimport) int value;
 };
 
-// Accessor: always refers to static_answer<answer_dllvar, void>::value —
-// the one shared linker symbol — regardless of which specialization is active.
 inline int& answer() { return static_answer<answer_dllvar>::value; }