ceph/src/boost/boost/asio/traits/set_error_free.hpp

   1 //
   2 // traits/set_error_free.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_TRAITS_SET_ERROR_FREE_HPP
  12 #define BOOST_ASIO_TRAITS_SET_ERROR_FREE_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 #include <boost/asio/detail/type_traits.hpp>
  20
  21 #if defined(BOOST_ASIO_HAS_DECLTYPE) \
  22   && defined(BOOST_ASIO_HAS_NOEXCEPT) \
  23   && defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE)
  24 # define BOOST_ASIO_HAS_DEDUCED_SET_ERROR_FREE_TRAIT 1
  25 #endif // defined(BOOST_ASIO_HAS_DECLTYPE)
  26        //   && defined(BOOST_ASIO_HAS_NOEXCEPT)
  27        //   && defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE)
  28
  29 #include <boost/asio/detail/push_options.hpp>
  30
  31 namespace boost {
  32 namespace asio {
  33 namespace traits {
  34
  35 template <typename T, typename E, typename = void>
  36 struct set_error_free_default;
  37
  38 template <typename T, typename E, typename = void>
  39 struct set_error_free;
  40
  41 } // namespace traits
  42 namespace detail {
  43
  44 struct no_set_error_free
  45 {
  46   BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = false);
  47   BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
  48 };
  49
  50 #if defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_FREE_TRAIT)
  51
  52 template <typename T, typename E, typename = void>
  53 struct set_error_free_trait : no_set_error_free
  54 {
  55 };
  56
  57 template <typename T, typename E>
  58 struct set_error_free_trait<T, E,
  59   typename void_type<
  60     decltype(set_error(declval<T>(), declval<E>()))
  61   >::type>
  62 {
  63   BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
  64
  65   using result_type = decltype(
  66     set_error(declval<T>(), declval<E>()));
  67
  68   BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = noexcept(
  69     set_error(declval<T>(), declval<E>())));
  70 };
  71
  72 #else // defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_FREE_TRAIT)
  73
  74 template <typename T, typename E, typename = void>
  75 struct set_error_free_trait :
  76   conditional<
  77     is_same<T, typename remove_reference<T>::type>::value
  78       && is_same<E, typename decay<E>::type>::value,
  79     typename conditional<
  80       is_same<T, typename add_const<T>::type>::value,
  81       no_set_error_free,
  82       traits::set_error_free<typename add_const<T>::type, E>
  83     >::type,
  84     traits::set_error_free<
  85       typename remove_reference<T>::type,
  86       typename decay<E>::type>
  87   >::type
  88 {
  89 };
  90
  91 #endif // defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_FREE_TRAIT)
  92
  93 } // namespace detail
  94 namespace traits {
  95
  96 template <typename T, typename E, typename>
  97 struct set_error_free_default :
  98   detail::set_error_free_trait<T, E>
  99 {
 100 };
 101
 102 template <typename T, typename E, typename>
 103 struct set_error_free :
 104   set_error_free_default<T, E>
 105 {
 106 };
 107
 108 } // namespace traits
 109 } // namespace asio
 110 } // namespace boost
 111
 112 #include <boost/asio/detail/pop_options.hpp>
 113
 114 #endif // BOOST_ASIO_TRAITS_SET_ERROR_FREE_HPP