boost/asio/detail/future.hpp
// // detail/future.hpp // ~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) // // 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) // #ifndef BOOST_ASIO_DETAIL_FUTURE_HPP #define BOOST_ASIO_DETAIL_FUTURE_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/config.hpp> #if defined(BOOST_ASIO_HAS_STD_FUTURE) # include <future> // Even though the future header is available, libstdc++ may not implement the // std::future class itself. However, we need to have already included the // future header to reliably test for _GLIBCXX_HAS_GTHREADS. # if defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX) # if defined(_GLIBCXX_HAS_GTHREADS) # define BOOST_ASIO_HAS_STD_FUTURE_CLASS 1 # endif // defined(_GLIBCXX_HAS_GTHREADS) # else // defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX) # define BOOST_ASIO_HAS_STD_FUTURE_CLASS 1 # endif // defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX) #endif // defined(BOOST_ASIO_HAS_STD_FUTURE) #endif // BOOST_ASIO_DETAIL_FUTURE_HPP