asio/detail/future.hpp

0001 //
0002 // detail/future.hpp
0003 // ~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010
0011 #ifndef BOOST_ASIO_DETAIL_FUTURE_HPP
0012 #define BOOST_ASIO_DETAIL_FUTURE_HPP
0013
0014 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0015 # pragma once
0016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0017
0018 #include <boost/asio/detail/config.hpp>
0019 #include <future>
0020
0021 // Even though the future header is available, libstdc++ may not implement the
0022 // std::future class itself. However, we need to have already included the
0023 // future header to reliably test for _GLIBCXX_HAS_GTHREADS.
0024 #if defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
0025 # if defined(_GLIBCXX_HAS_GTHREADS)
0026 #  define BOOST_ASIO_HAS_STD_FUTURE_CLASS 1
0027 # endif // defined(_GLIBCXX_HAS_GTHREADS)
0028 #else // defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
0029 # define BOOST_ASIO_HAS_STD_FUTURE_CLASS 1
0030 #endif // defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
0031
0032 #endif // BOOST_ASIO_DETAIL_FUTURE_HPP