Compilation error when using Boost

[StefanoPetrilli]

While working on #1066, I noticed that when running the following command to build using BOOST:

mkdir build && cd build
cmake .. -DCROW_USE_BOOST=ON
cmake --build . --target all

I get the following compilation error:

[ 92%] Building CXX object tests/CMakeFiles/unittest.dir/unittest.cpp.o
/home/stefano/repos/Crow/tests/unittest.cpp: In lambda function:
/home/stefano/repos/Crow/tests/unittest.cpp:4152:15: error: ‘error_code’ is not a member of ‘boost::asio’
 4152 |         asio::error_code error;
      |               ^~~~~~~~~~
/home/stefano/repos/Crow/tests/unittest.cpp:4152:15: note: suggested alternatives:
In file included from /usr/include/c++/13/bits/ios_base.h:46,
                 from /usr/include/c++/13/ios:44,
                 from /usr/include/c++/13/ostream:40,
                 from /usr/include/c++/13/iostream:41,
                 from /home/stefano/repos/Crow/tests/unittest.cpp:6:
/usr/include/c++/13/system_error:223:9: note:   ‘std::error_code’
  223 |   class error_code
      |         ^~~~~~~~~~
In file included from /home/stefano/repos/Crow/include/crow.h:26,
                 from /home/stefano/repos/Crow/tests/unittest.cpp:13:
/home/stefano/repos/Crow/include/crow/http_server.h:36:11: note:   ‘crow::error_code’
   36 |     using error_code = boost::system::error_code;
      |           ^~~~~~~~~~
In file included from /usr/include/boost/system/error_code.hpp:13,
                 from /usr/include/boost/asio/detail/throw_error.hpp:20,
                 from /usr/include/boost/asio/detail/impl/posix_event.ipp:23,
                 from /usr/include/boost/asio/detail/posix_event.hpp:172,
                 from /usr/include/boost/asio/detail/event.hpp:25,
                 from /usr/include/boost/asio/execution/blocking_adaptation.hpp:19,
                 from /usr/include/boost/asio/execution.hpp:22,
                 from /usr/include/boost/asio/any_completion_executor.hpp:22,
                 from /usr/include/boost/asio.hpp:20,
                 from /home/stefano/repos/Crow/include/crow/socket_adaptors.h:4,
                 from /home/stefano/repos/Crow/include/crow.h:7:
/usr/include/boost/system/detail/error_code.hpp:64:7: note:   ‘boost::system::error_code’
   64 | class error_code
      |       ^~~~~~~~~~
/home/stefano/repos/Crow/tests/unittest.cpp:4156:60: error: ‘error’ was not declared in this scope
 4156 |             size_t len = c.read_some(asio::buffer(buffer), error);
      |                                                            ^~~~~
/home/stefano/repos/Crow/tests/unittest.cpp:4156:60: note: suggested alternatives:
In file included from /usr/include/boost/asio/detail/impl/posix_event.ipp:24:
/usr/include/boost/asio/error.hpp:66:11: note:   ‘boost::asio::error’
   66 | namespace error {
      |           ^~~~~
In file included from /usr/include/boost/asio.hpp:161:
/usr/include/boost/asio/placeholders.hpp:65:22: note:   ‘boost::asio::placeholders::error’
   65 | inline boost::arg<1> error()
      |                      ^~~~~
gmake[2]: *** [tests/CMakeFiles/unittest.dir/build.make:76: tests/CMakeFiles/unittest.dir/unittest.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:716: tests/CMakeFiles/unittest.dir/all] Error 2
gmake: *** [Makefile:166: all] Error 2

[gittiver]

closed with #1070