--- /dev/null
+//
+// execution/executor.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_EXECUTION_EXECUTOR_HPP
+#define BOOST_ASIO_EXECUTION_EXECUTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/execution/execute.hpp>
+#include <boost/asio/execution/invocable_archetype.hpp>
+#include <boost/asio/traits/equality_comparable.hpp>
+
+#if defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_FREE_TRAIT) \
+ && defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) \
+ && defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+# define BOOST_ASIO_HAS_DEDUCED_EXECUTION_IS_EXECUTOR_TRAIT 1
+#endif // defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_FREE_TRAIT)
+ // && defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
+ // && defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace execution {
+namespace detail {
+
+template <typename T, typename F>
+struct is_executor_of_impl_base :
+ integral_constant<bool,
+ conditional<true, true_type,
+ typename result_of<typename decay<F>::type&()>::type
+ >::type::value
+ && is_constructible<typename decay<F>::type, F>::value
+ && is_move_constructible<typename decay<F>::type>::value
+#if defined(BOOST_ASIO_HAS_NOEXCEPT)
+ && is_nothrow_copy_constructible<T>::value
+ && is_nothrow_destructible<T>::value
+#else // defined(BOOST_ASIO_HAS_NOEXCEPT)
+ && is_copy_constructible<T>::value
+ && is_destructible<T>::value
+#endif // defined(BOOST_ASIO_HAS_NOEXCEPT)
+ && traits::equality_comparable<T>::is_valid
+ && traits::equality_comparable<T>::is_noexcept
+ >
+{
+};
+
+template <typename T, typename F>
+struct is_executor_of_impl :
+ conditional<
+ can_execute<typename add_const<T>::type, F>::value,
+ is_executor_of_impl_base<T, F>,
+ false_type
+ >::type
+{
+};
+
+template <typename T, typename = void>
+struct executor_shape
+{
+ typedef std::size_t type;
+};
+
+template <typename T>
+struct executor_shape<T,
+ typename void_type<
+ typename T::shape_type
+ >::type>
+{
+ typedef typename T::shape_type type;
+};
+
+template <typename T, typename Default, typename = void>
+struct executor_index
+{
+ typedef Default type;
+};
+
+template <typename T, typename Default>
+struct executor_index<T, Default,
+ typename void_type<
+ typename T::index_type
+ >::type>
+{
+ typedef typename T::index_type type;
+};
+
+} // namespace detail
+
+/// The is_executor trait detects whether a type T satisfies the
+/// execution::executor concept.
+/**
+ * Class template @c is_executor is a UnaryTypeTrait that is derived from @c
+ * true_type if the type @c T meets the concept definition for an executor,
+ * otherwise @c false_type.
+ */
+template <typename T>
+struct is_executor :
+#if defined(GENERATING_DOCUMENTATION)
+ integral_constant<bool, automatically_determined>
+#else // defined(GENERATING_DOCUMENTATION)
+ detail::is_executor_of_impl<T, invocable_archetype>
+#endif // defined(GENERATING_DOCUMENTATION)
+{
+};
+
+#if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T>
+BOOST_ASIO_CONSTEXPR const bool is_executor_v = is_executor<T>::value;
+
+#endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+#if defined(BOOST_ASIO_HAS_CONCEPTS)
+
+template <typename T>
+BOOST_ASIO_CONCEPT executor = is_executor<T>::value;
+
+#define BOOST_ASIO_EXECUTION_EXECUTOR ::boost::asio::execution::executor
+
+#else // defined(BOOST_ASIO_HAS_CONCEPTS)
+
+#define BOOST_ASIO_EXECUTION_EXECUTOR typename
+
+#endif // defined(BOOST_ASIO_HAS_CONCEPTS)
+
+/// The is_executor_of trait detects whether a type T satisfies the
+/// execution::executor_of concept for some set of value arguments.
+/**
+ * Class template @c is_executor_of is a type trait that is derived from @c
+ * true_type if the type @c T meets the concept definition for an executor
+ * that is invocable with a function object of type @c F, otherwise @c
+ * false_type.
+ */
+template <typename T, typename F>
+struct is_executor_of :
+#if defined(GENERATING_DOCUMENTATION)
+ integral_constant<bool, automatically_determined>
+#else // defined(GENERATING_DOCUMENTATION)
+ integral_constant<bool,
+ is_executor<T>::value && detail::is_executor_of_impl<T, F>::value
+ >
+#endif // defined(GENERATING_DOCUMENTATION)
+{
+};
+
+#if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+template <typename T, typename F>
+BOOST_ASIO_CONSTEXPR const bool is_executor_of_v =
+ is_executor_of<T, F>::value;
+
+#endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
+
+#if defined(BOOST_ASIO_HAS_CONCEPTS)
+
+template <typename T, typename F>
+BOOST_ASIO_CONCEPT executor_of = is_executor_of<T, F>::value;
+
+#define BOOST_ASIO_EXECUTION_EXECUTOR_OF(f) \
+ ::boost::asio::execution::executor_of<f>
+
+#else // defined(BOOST_ASIO_HAS_CONCEPTS)
+
+#define BOOST_ASIO_EXECUTION_EXECUTOR_OF typename
+
+#endif // defined(BOOST_ASIO_HAS_CONCEPTS)
+
+/// The executor_shape trait detects the type used by an executor to represent
+/// the shape of a bulk operation.
+/**
+ * Class template @c executor_shape is a type trait with a nested type alias
+ * @c type whose type is @c T::shape_type if @c T::shape_type is valid,
+ * otherwise @c std::size_t.
+ */
+template <typename T>
+struct executor_shape
+#if !defined(GENERATING_DOCUMENTATION)
+ : detail::executor_shape<T>
+#endif // !defined(GENERATING_DOCUMENTATION)
+{
+#if defined(GENERATING_DOCUMENTATION)
+ /// @c T::shape_type if @c T::shape_type is valid, otherwise @c std::size_t.
+ typedef automatically_determined type;
+#endif // defined(GENERATING_DOCUMENTATION)
+};
+
+#if defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
+
+template <typename T>
+using executor_shape_t = typename executor_shape<T>::type;
+
+#endif // defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
+
+/// The executor_index trait detects the type used by an executor to represent
+/// an index within a bulk operation.
+/**
+ * Class template @c executor_index is a type trait with a nested type alias
+ * @c type whose type is @c T::index_type if @c T::index_type is valid,
+ * otherwise @c executor_shape_t<T>.
+ */
+template <typename T>
+struct executor_index
+#if !defined(GENERATING_DOCUMENTATION)
+ : detail::executor_index<T, typename executor_shape<T>::type>
+#endif // !defined(GENERATING_DOCUMENTATION)
+{
+#if defined(GENERATING_DOCUMENTATION)
+ /// @c T::index_type if @c T::index_type is valid, otherwise
+ /// @c executor_shape_t<T>.
+ typedef automatically_determined type;
+#endif // defined(GENERATING_DOCUMENTATION)
+};
+
+#if defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
+
+template <typename T>
+using executor_index_t = typename executor_index<T>::type;
+
+#endif // defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)
+
+} // namespace execution
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_EXECUTION_EXECUTOR_HPP
projects / ceph.git / blobdiff