Standalone ASIO with Visual Studio 2015
ASIO is a C++ networking library included in Boost C++.
In its standard configuration ASIO relies heavily on Boost, however what if you don’t want to have Boost as a dependency?
ASIO can be defined as standalone in your project settings.
This page says (for MSVC 2012) to define ASIO_STANDALONE, it was not as simple as this for me, below is what I did to use standalone ASIO in VS 2015.
Apparently ASIO will not automatically detect C++11 features available, these need to be specified manually.
In C/C++ Preprocessor Settings, I defined:
ASIO_STANDALONE ASIO_HAS_STD_ADDRESSOF ASIO_HAS_STD_ARRAY ASIO_HAS_CSTDINT ASIO_HAS_STD_SHARED_PTR ASIO_HAS_STD_TYPE_TRAITS ASIO_HAS_VARIADIC_TEMPLATES ASIO_HAS_STD_FUNCTION ASIO_HAS_STD_CHRONO BOOST_ALL_NO_LIB _WIN32_WINNT=0x0501 _WINSOCK_DEPRECATED_NO_WARNINGS
Some searching lead me to this stackoverflow page which is where the first five ASIO_HAS_* come from.
The remaining three I tracked down manually, by opening the .hpp files that were using boost headers and determining the missing define.
For example, in basic_socket_iostream.hpp ASIO_HAS_VARIADIC_TEMPLATES was undefined and therefore attempting to include boost headers.
Specifing that these features exist prevents boost from being included.
Now for source errors
In the file random_access_handle_service.hpp there is a single line that always includes boost/config.hpp this needs to be changed when in standalone mode.
Lastly there were errors generated by win_iocp_io_service.ipp caused by a missing include for using std::min
For the last few defines:
BOOST_ALL_NO_LIB _WIN32_WINNT=0x0501 _WINSOCK_DEPRECATED_NO_WARNINGS
BOOST_ALL_NO_LIB prevents automatic linking to Boost libraries
_WIN32_WINNT=0x0501 asio generated a warning telling me to defined this, so I did :p
_WINSOCK_DEPRECATED_NO_WARNINGS last step for a successful build
Just for fun here is an example program:
Everything should work swimmingly :D