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  1. //
  2. // detail/future.hpp
  3. // ~~~~~~~~~~~~~~~~~
  4. //
  5. // Copyright (c) 2003-2019 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. #ifndef ASIO_DETAIL_FUTURE_HPP
  11. #define ASIO_DETAIL_FUTURE_HPP
  12. #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  13. # pragma once
  14. #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  15. #include "asio/detail/config.hpp"
  16. #if defined(ASIO_HAS_STD_FUTURE)
  17. # include <future>
  18. // Even though the future header is available, libstdc++ may not implement the
  19. // std::future class itself. However, we need to have already included the
  20. // future header to reliably test for _GLIBCXX_HAS_GTHREADS.
  21. # if defined(__GNUC__) && !defined(ASIO_HAS_CLANG_LIBCXX)
  22. # if defined(_GLIBCXX_HAS_GTHREADS)
  23. # define ASIO_HAS_STD_FUTURE_CLASS 1
  24. # endif // defined(_GLIBCXX_HAS_GTHREADS)
  25. # else // defined(__GNUC__) && !defined(ASIO_HAS_CLANG_LIBCXX)
  26. # define ASIO_HAS_STD_FUTURE_CLASS 1
  27. # endif // defined(__GNUC__) && !defined(ASIO_HAS_CLANG_LIBCXX)
  28. #endif // defined(ASIO_HAS_STD_FUTURE)
  29. #endif // ASIO_DETAIL_FUTURE_HPP