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  1. //
  2. // detail/non_const_lvalue.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_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. #if defined(ASIO_HAS_MOVE)
  24. explicit non_const_lvalue(T& t)
  25. : value(static_cast<typename conditional<
  26. is_same<T, typename decay<T>::type>::value,
  27. typename decay<T>::type&, T&&>::type>(t))
  28. {
  29. }
  30. typename conditional<is_same<T, typename decay<T>::type>::value,
  31. typename decay<T>::type&, typename decay<T>::type>::type value;
  32. #else // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
  33. explicit non_const_lvalue(const typename decay<T>::type& t)
  34. : value(t)
  35. {
  36. }
  37. typename decay<T>::type value;
  38. #endif // defined(ASIO_HAS_MOVE)
  39. };
  40. } // namespace detail
  41. } // namespace asio
  42. #include "asio/detail/pop_options.hpp"
  43. #endif // ASIO_DETAIL_NON_CONST_LVALUE_HPP