asio/detail/global.hpp

0001 //
0002 // detail/global.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_GLOBAL_HPP
0012 #define BOOST_ASIO_DETAIL_GLOBAL_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
0020 #if !defined(BOOST_ASIO_HAS_THREADS)
0021 # include <boost/asio/detail/null_global.hpp>
0022 #elif defined(BOOST_ASIO_WINDOWS)
0023 # include <boost/asio/detail/win_global.hpp>
0024 #elif defined(BOOST_ASIO_HAS_PTHREADS)
0025 # include <boost/asio/detail/posix_global.hpp>
0026 #else
0027 # include <boost/asio/detail/std_global.hpp>
0028 #endif
0029
0030 namespace boost {
0031 namespace asio {
0032 namespace detail {
0033
0034 template <typename T>
0035 inline T& global()
0036 {
0037 #if !defined(BOOST_ASIO_HAS_THREADS)
0038   return null_global<T>();
0039 #elif defined(BOOST_ASIO_WINDOWS)
0040   return win_global<T>();
0041 #elif defined(BOOST_ASIO_HAS_PTHREADS)
0042   return posix_global<T>();
0043 #else
0044   return std_global<T>();
0045 #endif
0046 }
0047
0048 } // namespace detail
0049 } // namespace asio
0050 } // namespace boost
0051
0052 #endif // BOOST_ASIO_DETAIL_GLOBAL_HPP