append.hpp 2.3 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980
  1. //
  2. // append.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 BOOST_ASIO_APPEND_HPP
  11. #define BOOST_ASIO_APPEND_HPP
  12. #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  13. # pragma once
  14. #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  15. #include <boost/asio/detail/config.hpp>
  16. #if (defined(BOOST_ASIO_HAS_STD_TUPLE) \
  17. && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)) \
  18. || defined(GENERATING_DOCUMENTATION)
  19. #include <tuple>
  20. #include <boost/asio/detail/type_traits.hpp>
  21. #include <boost/asio/detail/push_options.hpp>
  22. namespace boost {
  23. namespace asio {
  24. /// Completion token type used to specify that the completion handler
  25. /// arguments should be passed additional values after the results of the
  26. /// operation.
  27. template <typename CompletionToken, typename... Values>
  28. class append_t
  29. {
  30. public:
  31. /// Constructor.
  32. template <typename T, typename... V>
  33. BOOST_ASIO_CONSTEXPR explicit append_t(
  34. BOOST_ASIO_MOVE_ARG(T) completion_token,
  35. BOOST_ASIO_MOVE_ARG(V)... values)
  36. : token_(BOOST_ASIO_MOVE_CAST(T)(completion_token)),
  37. values_(BOOST_ASIO_MOVE_CAST(V)(values)...)
  38. {
  39. }
  40. //private:
  41. CompletionToken token_;
  42. std::tuple<Values...> values_;
  43. };
  44. /// Completion token type used to specify that the completion handler
  45. /// arguments should be passed additional values after the results of the
  46. /// operation.
  47. template <typename CompletionToken, typename... Values>
  48. BOOST_ASIO_NODISCARD inline BOOST_ASIO_CONSTEXPR append_t<
  49. typename decay<CompletionToken>::type, typename decay<Values>::type...>
  50. append(BOOST_ASIO_MOVE_ARG(CompletionToken) completion_token,
  51. BOOST_ASIO_MOVE_ARG(Values)... values)
  52. {
  53. return append_t<
  54. typename decay<CompletionToken>::type, typename decay<Values>::type...>(
  55. BOOST_ASIO_MOVE_CAST(CompletionToken)(completion_token),
  56. BOOST_ASIO_MOVE_CAST(Values)(values)...);
  57. }
  58. } // namespace asio
  59. } // namespace boost
  60. #include <boost/asio/detail/pop_options.hpp>
  61. #include <boost/asio/impl/append.hpp>
  62. #endif // (defined(BOOST_ASIO_HAS_STD_TUPLE)
  63. // && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES))
  64. // || defined(GENERATING_DOCUMENTATION)
  65. #endif // BOOST_ASIO_APPEND_HPP