ceph/src/boost/boost/asio/detail/future.hpp

   1 //
   2 // detail/future.hpp
   3 // ~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_DETAIL_FUTURE_HPP
  12 #define BOOST_ASIO_DETAIL_FUTURE_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19 #if defined(BOOST_ASIO_HAS_STD_FUTURE)
  20 # include <future>
  21 // Even though the future header is available, libstdc++ may not implement the
  22 // std::future class itself. However, we need to have already included the
  23 // future header to reliably test for _GLIBCXX_HAS_GTHREADS.
  24 # if defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
  25 #  if defined(_GLIBCXX_HAS_GTHREADS)
  26 #   define BOOST_ASIO_HAS_STD_FUTURE_CLASS 1
  27 #  endif // defined(_GLIBCXX_HAS_GTHREADS)
  28 # else // defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
  29 #  define BOOST_ASIO_HAS_STD_FUTURE_CLASS 1
  30 # endif // defined(__GNUC__) && !defined(BOOST_ASIO_HAS_CLANG_LIBCXX)
  31 #endif // defined(BOOST_ASIO_HAS_STD_FUTURE)
  32
  33 #endif // BOOST_ASIO_DETAIL_FUTURE_HPP