ceph/src/boost/boost/asio/execution/receiver.hpp

   1 //
   2 // execution/receiver.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_EXECUTION_RECEIVER_HPP
  12 #define BOOST_ASIO_EXECUTION_RECEIVER_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 #include <boost/asio/detail/variadic_templates.hpp>
  21 #include <boost/asio/execution/set_done.hpp>
  22 #include <boost/asio/execution/set_error.hpp>
  23 #include <boost/asio/execution/set_value.hpp>
  24
  25 #if defined(BOOST_ASIO_HAS_STD_EXCEPTION_PTR)
  26 # include <exception>
  27 #else // defined(BOOST_ASIO_HAS_STD_EXCEPTION_PTR)
  28 # include <boost/system/error_code.hpp>
  29 #endif // defined(BOOST_ASIO_HAS_STD_EXCEPTION_PTR)
  30
  31 #if defined(BOOST_ASIO_HAS_DEDUCED_SET_DONE_FREE_TRAIT) \
  32   && defined(BOOST_ASIO_HAS_DEDUCED_SET_DONE_MEMBER_TRAIT) \
  33   && defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_FREE_TRAIT) \
  34   && defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT) \
  35   && defined(BOOST_ASIO_HAS_DEDUCED_SET_VALUE_FREE_TRAIT) \
  36   && defined(BOOST_ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT) \
  37   && defined(BOOST_ASIO_HAS_DEDUCED_RECEIVER_OF_FREE_TRAIT) \
  38   && defined(BOOST_ASIO_HAS_DEDUCED_RECEIVER_OF_MEMBER_TRAIT)
  39 # define BOOST_ASIO_HAS_DEDUCED_EXECUTION_IS_RECEIVER_TRAIT 1
  40 #endif // defined(BOOST_ASIO_HAS_DEDUCED_SET_DONE_FREE_TRAIT)
  41        //   && defined(BOOST_ASIO_HAS_DEDUCED_SET_DONE_MEMBER_TRAIT)
  42        //   && defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_FREE_TRAIT)
  43        //   && defined(BOOST_ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT)
  44        //   && defined(BOOST_ASIO_HAS_DEDUCED_SET_VALUE_FREE_TRAIT)
  45        //   && defined(BOOST_ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT)
  46        //   && defined(BOOST_ASIO_HAS_DEDUCED_RECEIVER_OF_FREE_TRAIT)
  47        //   && defined(BOOST_ASIO_HAS_DEDUCED_RECEIVER_OF_MEMBER_TRAIT)
  48
  49 #include <boost/asio/detail/push_options.hpp>
  50
  51 namespace boost {
  52 namespace asio {
  53 namespace execution {
  54 namespace detail {
  55
  56 template <typename T, typename E>
  57 struct is_receiver_base :
  58   integral_constant<bool,
  59     is_move_constructible<typename remove_cvref<T>::type>::value
  60       && is_constructible<typename remove_cvref<T>::type, T>::value
  61   >
  62 {
  63 };
  64
  65 } // namespace detail
  66
  67 #if defined(BOOST_ASIO_HAS_STD_EXCEPTION_PTR)
  68 # define BOOST_ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT = std::exception_ptr
  69 #else // defined(BOOST_ASIO_HAS_STD_EXCEPTION_PTR)
  70 # define BOOST_ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT \
  71   = ::boost::system::error_code
  72 #endif // defined(BOOST_ASIO_HAS_STD_EXCEPTION_PTR)
  73
  74 /// The is_receiver trait detects whether a type T satisfies the
  75 /// execution::receiver concept.
  76 /**
  77  * Class template @c is_receiver is a type trait that is derived from @c
  78  * true_type if the type @c T meets the concept definition for a receiver for
  79  * error type @c E, otherwise @c false_type.
  80  */
  81 template <typename T, typename E BOOST_ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT>
  82 struct is_receiver :
  83 #if defined(GENERATING_DOCUMENTATION)
  84   integral_constant<bool, automatically_determined>
  85 #else // defined(GENERATING_DOCUMENTATION)
  86   conditional<
  87     can_set_done<typename remove_cvref<T>::type>::value
  88       && is_nothrow_set_done<typename remove_cvref<T>::type>::value
  89       && can_set_error<typename remove_cvref<T>::type, E>::value
  90       && is_nothrow_set_error<typename remove_cvref<T>::type, E>::value,
  91     detail::is_receiver_base<T, E>,
  92     false_type
  93   >::type
  94 #endif // defined(GENERATING_DOCUMENTATION)
  95 {
  96 };
  97
  98 #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
  99
 100 template <typename T, typename E BOOST_ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT>
 101 BOOST_ASIO_CONSTEXPR const bool is_receiver_v = is_receiver<T, E>::value;
 102
 103 #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
 104
 105 #if defined(BOOST_ASIO_HAS_CONCEPTS)
 106
 107 template <typename T, typename E BOOST_ASIO_EXECUTION_RECEIVER_ERROR_DEFAULT>
 108 BOOST_ASIO_CONCEPT receiver = is_receiver<T, E>::value;
 109
 110 #define BOOST_ASIO_EXECUTION_RECEIVER ::boost::asio::execution::receiver
 111
 112 #else // defined(BOOST_ASIO_HAS_CONCEPTS)
 113
 114 #define BOOST_ASIO_EXECUTION_RECEIVER typename
 115
 116 #endif // defined(BOOST_ASIO_HAS_CONCEPTS)
 117
 118 #if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES) \
 119   || defined(GENERATING_DOCUMENTATION)
 120
 121 /// The is_receiver_of trait detects whether a type T satisfies the
 122 /// execution::receiver_of concept for some set of value arguments.
 123 /**
 124  * Class template @c is_receiver_of is a type trait that is derived from @c
 125  * true_type if the type @c T meets the concept definition for a receiver for
 126  * value arguments @c Vs, otherwise @c false_type.
 127  */
 128 template <typename T, typename... Vs>
 129 struct is_receiver_of :
 130 #if defined(GENERATING_DOCUMENTATION)
 131   integral_constant<bool, automatically_determined>
 132 #else // defined(GENERATING_DOCUMENTATION)
 133   conditional<
 134     is_receiver<T>::value,
 135     can_set_value<typename remove_cvref<T>::type, Vs...>,
 136     false_type
 137   >::type
 138 #endif // defined(GENERATING_DOCUMENTATION)
 139 {
 140 };
 141
 142 #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
 143
 144 template <typename T, typename... Vs>
 145 BOOST_ASIO_CONSTEXPR const bool is_receiver_of_v =
 146   is_receiver_of<T, Vs...>::value;
 147
 148 #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
 149
 150 #if defined(BOOST_ASIO_HAS_CONCEPTS)
 151
 152 template <typename T, typename... Vs>
 153 BOOST_ASIO_CONCEPT receiver_of = is_receiver_of<T, Vs...>::value;
 154
 155 #define BOOST_ASIO_EXECUTION_RECEIVER_OF_0 \
 156   ::boost::asio::execution::receiver_of
 157
 158 #define BOOST_ASIO_EXECUTION_RECEIVER_OF_1(v) \
 159   ::boost::asio::execution::receiver_of<v>
 160
 161 #else // defined(BOOST_ASIO_HAS_CONCEPTS)
 162
 163 #define BOOST_ASIO_EXECUTION_RECEIVER_OF_0 typename
 164 #define BOOST_ASIO_EXECUTION_RECEIVER_OF_1(v) typename
 165
 166 #endif // defined(BOOST_ASIO_HAS_CONCEPTS)
 167
 168 #else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
 169       //   || defined(GENERATING_DOCUMENTATION)
 170
 171 template <typename T, typename = void,
 172     typename = void, typename = void, typename = void, typename = void,
 173     typename = void, typename = void, typename = void, typename = void>
 174 struct is_receiver_of;
 175
 176 template <typename T>
 177 struct is_receiver_of<T> :
 178   conditional<
 179     is_receiver<T>::value,
 180     can_set_value<typename remove_cvref<T>::type>,
 181     false_type
 182   >::type
 183 {
 184 };
 185
 186 #define BOOST_ASIO_PRIVATE_RECEIVER_OF_TRAITS_DEF(n) \
 187   template <typename T, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
 188   struct is_receiver_of<T, BOOST_ASIO_VARIADIC_TARGS(n)> : \
 189     conditional< \
 190       conditional<true, is_receiver<T>, void>::type::value, \
 191       can_set_value< \
 192         typename remove_cvref<T>::type, \
 193         BOOST_ASIO_VARIADIC_TARGS(n)>, \
 194       false_type \
 195     >::type \
 196   { \
 197   }; \
 198   /**/
 199 BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_RECEIVER_OF_TRAITS_DEF)
 200 #undef BOOST_ASIO_PRIVATE_RECEIVER_OF_TRAITS_DEF
 201
 202 #define BOOST_ASIO_EXECUTION_RECEIVER_OF_0 typename
 203 #define BOOST_ASIO_EXECUTION_RECEIVER_OF_1(v) typename
 204
 205 #endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
 206        //   || defined(GENERATING_DOCUMENTATION)
 207
 208 #if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES) \
 209   || defined(GENERATING_DOCUMENTATION)
 210
 211 /// The is_nothrow_receiver_of trait detects whether a type T satisfies the
 212 /// execution::receiver_of concept for some set of value arguments, with a
 213 /// noexcept @c set_value operation.
 214 /**
 215  * Class template @c is_nothrow_receiver_of is a type trait that is derived
 216  * from @c true_type if the type @c T meets the concept definition for a
 217  * receiver for value arguments @c Vs, and the expression
 218  * <tt>execution::set_value(declval<T>(), declval<Ts>()...)</tt> is noexcept,
 219  * otherwise @c false_type.
 220  */
 221 template <typename T, typename... Vs>
 222 struct is_nothrow_receiver_of :
 223 #if defined(GENERATING_DOCUMENTATION)
 224   integral_constant<bool, automatically_determined>
 225 #else // defined(GENERATING_DOCUMENTATION)
 226   integral_constant<bool,
 227     is_receiver_of<T, Vs...>::value
 228       && is_nothrow_set_value<typename remove_cvref<T>::type, Vs...>::value
 229   >
 230 #endif // defined(GENERATING_DOCUMENTATION)
 231 {
 232 };
 233
 234 #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
 235
 236 template <typename T, typename... Vs>
 237 BOOST_ASIO_CONSTEXPR const bool is_nothrow_receiver_of_v =
 238   is_nothrow_receiver_of<T, Vs...>::value;
 239
 240 #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
 241
 242 #else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
 243       //   || defined(GENERATING_DOCUMENTATION)
 244
 245 template <typename T, typename = void,
 246     typename = void, typename = void, typename = void, typename = void,
 247     typename = void, typename = void, typename = void, typename = void>
 248 struct is_nothrow_receiver_of;
 249
 250 template <typename T>
 251 struct is_nothrow_receiver_of<T> :
 252   integral_constant<bool,
 253     is_receiver_of<T>::value
 254       && is_nothrow_set_value<typename remove_cvref<T>::type>::value
 255   >
 256 {
 257 };
 258
 259 #define BOOST_ASIO_PRIVATE_NOTHROW_RECEIVER_OF_TRAITS_DEF(n) \
 260   template <typename T, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
 261   struct is_nothrow_receiver_of<T, BOOST_ASIO_VARIADIC_TARGS(n)> : \
 262     integral_constant<bool, \
 263       is_receiver_of<T, BOOST_ASIO_VARIADIC_TARGS(n)>::value \
 264         && is_nothrow_set_value<typename remove_cvref<T>::type, \
 265           BOOST_ASIO_VARIADIC_TARGS(n)>::value \
 266     > \
 267   { \
 268   }; \
 269   /**/
 270 BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_NOTHROW_RECEIVER_OF_TRAITS_DEF)
 271 #undef BOOST_ASIO_PRIVATE_NOTHROW_RECEIVER_OF_TRAITS_DEF
 272
 273 #endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
 274        //   || defined(GENERATING_DOCUMENTATION)
 275
 276 } // namespace execution
 277 } // namespace asio
 278 } // namespace boost
 279
 280 #include <boost/asio/detail/pop_options.hpp>
 281
 282 #endif // BOOST_ASIO_EXECUTION_RECEIVER_HPP