non_const_lvalue.hpp 1.0 KB

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  1. //
  2. // detail/non_const_lvalue.hpp
  3. // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
  4. //
  5. // Copyright (c) 2003-2023 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_NON_CONST_LVALUE_HPP
  11. #define ASIO_DETAIL_NON_CONST_LVALUE_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. #include "asio/detail/type_traits.hpp"
  17. #include "asio/detail/push_options.hpp"
  18. namespace asio {
  19. namespace detail {
  20. template <typename T>
  21. struct non_const_lvalue
  22. {
  23. explicit non_const_lvalue(T& t)
  24. : value(static_cast<conditional_t<
  25. is_same<T, decay_t<T>>::value, decay_t<T>&, T&&>>(t))
  26. {
  27. }
  28. conditional_t<is_same<T, decay_t<T>>::value, decay_t<T>&, decay_t<T>> value;
  29. };
  30. } // namespace detail
  31. } // namespace asio
  32. #include "asio/detail/pop_options.hpp"
  33. #endif // ASIO_DETAIL_NON_CONST_LVALUE_HPP