boost/asio/detail/global.hpp
// // detail/global.hpp // ~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2019 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_GLOBAL_HPP #define BOOST_ASIO_DETAIL_GLOBAL_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_THREADS) # include <boost/asio/detail/null_global.hpp> #elif defined(BOOST_ASIO_WINDOWS) # include <boost/asio/detail/win_global.hpp> #elif defined(BOOST_ASIO_HAS_PTHREADS) # include <boost/asio/detail/posix_global.hpp> #elif defined(BOOST_ASIO_HAS_STD_CALL_ONCE) # include <boost/asio/detail/std_global.hpp> #else # error Only Windows, POSIX and std::call_once are supported! #endif namespace boost { namespace asio { namespace detail { template <typename T> inline T& global() { #if !defined(BOOST_ASIO_HAS_THREADS) return null_global<T>(); #elif defined(BOOST_ASIO_WINDOWS) return win_global<T>(); #elif defined(BOOST_ASIO_HAS_PTHREADS) return posix_global<T>(); #elif defined(BOOST_ASIO_HAS_STD_CALL_ONCE) return std_global<T>(); #endif } } // namespace detail } // namespace asio } // namespace boost #endif // BOOST_ASIO_DETAIL_GLOBAL_HPP