projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 20effc67 TL |
1 | // |
| 2 | // execution/operation_state.hpp | |
| 3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| 4 | // | |
| 1e59de90 | 5 | // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| 20effc67 TL |
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_OPERATION_STATE_HPP | |
| 12 | #define BOOST_ASIO_EXECUTION_OPERATION_STATE_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/execution/start.hpp> | |
| 21 | ||
| 22 | #if defined(BOOST_ASIO_HAS_DEDUCED_START_FREE_TRAIT) \ | |
| 23 | && defined(BOOST_ASIO_HAS_DEDUCED_START_MEMBER_TRAIT) | |
| 24 | # define BOOST_ASIO_HAS_DEDUCED_EXECUTION_IS_OPERATION_STATE_TRAIT 1 | |
| 25 | #endif // defined(BOOST_ASIO_HAS_DEDUCED_START_FREE_TRAIT) | |
| 26 | // && defined(BOOST_ASIO_HAS_DEDUCED_START_MEMBER_TRAIT) | |
| 27 | ||
| 28 | #include <boost/asio/detail/push_options.hpp> | |
| 29 | ||
| 30 | namespace boost { | |
| 31 | namespace asio { | |
| 32 | namespace execution { | |
| 33 | namespace detail { | |
| 34 | ||
| 35 | template <typename T> | |
| 36 | struct is_operation_state_base : | |
| 37 | integral_constant<bool, | |
| 38 | is_destructible<T>::value | |
| 39 | && is_object<T>::value | |
| 40 | > | |
| 41 | { | |
| 42 | }; | |
| 43 | ||
| 44 | } // namespace detail | |
| 45 | ||
| 46 | /// The is_operation_state trait detects whether a type T satisfies the | |
| 47 | /// execution::operation_state concept. | |
| 48 | /** | |
| 49 | * Class template @c is_operation_state is a type trait that is derived from | |
| 50 | * @c true_type if the type @c T meets the concept definition for an | |
| 51 | * @c operation_state, otherwise @c false_type. | |
| 52 | */ | |
| 53 | template <typename T> | |
| 54 | struct is_operation_state : | |
| 55 | #if defined(GENERATING_DOCUMENTATION) | |
| 56 | integral_constant<bool, automatically_determined> | |
| 57 | #else // defined(GENERATING_DOCUMENTATION) | |
| 58 | conditional< | |
| 59 | can_start<typename add_lvalue_reference<T>::type>::value | |
| 60 | && is_nothrow_start<typename add_lvalue_reference<T>::type>::value, | |
| 61 | detail::is_operation_state_base<T>, | |
| 62 | false_type | |
| 63 | >::type | |
| 64 | #endif // defined(GENERATING_DOCUMENTATION) | |
| 65 | { | |
| 66 | }; | |
| 67 | ||
| 68 | #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
| 69 | ||
| 70 | template <typename T> | |
| 71 | BOOST_ASIO_CONSTEXPR const bool is_operation_state_v = | |
| 72 | is_operation_state<T>::value; | |
| 73 | ||
| 74 | #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES) | |
| 75 | ||
| 76 | #if defined(BOOST_ASIO_HAS_CONCEPTS) | |
| 77 | ||
| 78 | template <typename T> | |
| 79 | BOOST_ASIO_CONCEPT operation_state = is_operation_state<T>::value; | |
| 80 | ||
| 81 | #define BOOST_ASIO_EXECUTION_OPERATION_STATE \ | |
| 82 | ::boost::asio::execution::operation_state | |
| 83 | ||
| 84 | #else // defined(BOOST_ASIO_HAS_CONCEPTS) | |
| 85 | ||
| 86 | #define BOOST_ASIO_EXECUTION_OPERATION_STATE typename | |
| 87 | ||
| 88 | #endif // defined(BOOST_ASIO_HAS_CONCEPTS) | |
| 89 | ||
| 90 | } // namespace execution | |
| 91 | } // namespace asio | |
| 92 | } // namespace boost | |
| 93 | ||
| 94 | #include <boost/asio/detail/pop_options.hpp> | |
| 95 | ||
| 96 | #endif // BOOST_ASIO_EXECUTION_OPERATION_STATE_HPP |