| // |
| // execution/submit.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 ASIO_EXECUTION_SUBMIT_HPP |
| #define ASIO_EXECUTION_SUBMIT_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include "asio/detail/config.hpp" |
| #include "asio/detail/type_traits.hpp" |
| #include "asio/execution/detail/submit_receiver.hpp" |
| #include "asio/execution/executor.hpp" |
| #include "asio/execution/receiver.hpp" |
| #include "asio/execution/sender.hpp" |
| #include "asio/execution/start.hpp" |
| #include "asio/traits/submit_member.hpp" |
| #include "asio/traits/submit_free.hpp" |
| |
| #include "asio/detail/push_options.hpp" |
| |
| #if defined(GENERATING_DOCUMENTATION) |
| |
| namespace asio { |
| namespace execution { |
| |
| /// A customisation point that submits a sender to a receiver. |
| /** |
| * The name <tt>execution::submit</tt> denotes a customisation point object. For |
| * some subexpressions <tt>s</tt> and <tt>r</tt>, let <tt>S</tt> be a type such |
| * that <tt>decltype((s))</tt> is <tt>S</tt> and let <tt>R</tt> be a type such |
| * that <tt>decltype((r))</tt> is <tt>R</tt>. The expression |
| * <tt>execution::submit(s, r)</tt> is ill-formed if <tt>sender_to<S, R></tt> is |
| * not <tt>true</tt>. Otherwise, it is expression-equivalent to: |
| * |
| * @li <tt>s.submit(r)</tt>, if that expression is valid and <tt>S</tt> models |
| * <tt>sender</tt>. If the function selected does not submit the receiver |
| * object <tt>r</tt> via the sender <tt>s</tt>, the program is ill-formed with |
| * no diagnostic required. |
| * |
| * @li Otherwise, <tt>submit(s, r)</tt>, if that expression is valid and |
| * <tt>S</tt> models <tt>sender</tt>, with overload resolution performed in a |
| * context that includes the declaration <tt>void submit();</tt> and that does |
| * not include a declaration of <tt>execution::submit</tt>. If the function |
| * selected by overload resolution does not submit the receiver object |
| * <tt>r</tt> via the sender <tt>s</tt>, the program is ill-formed with no |
| * diagnostic required. |
| * |
| * @li Otherwise, <tt>execution::start((new submit_receiver<S, |
| * R>{s,r})->state_)</tt>, where <tt>submit_receiver</tt> is an |
| * implementation-defined class template equivalent to: |
| * @code template<class S, class R> |
| * struct submit_receiver { |
| * struct wrap { |
| * submit_receiver * p_; |
| * template<class...As> |
| * requires receiver_of<R, As...> |
| * void set_value(As&&... as) && |
| * noexcept(is_nothrow_receiver_of_v<R, As...>) { |
| * execution::set_value(std::move(p_->r_), (As&&) as...); |
| * delete p_; |
| * } |
| * template<class E> |
| * requires receiver<R, E> |
| * void set_error(E&& e) && noexcept { |
| * execution::set_error(std::move(p_->r_), (E&&) e); |
| * delete p_; |
| * } |
| * void set_done() && noexcept { |
| * execution::set_done(std::move(p_->r_)); |
| * delete p_; |
| * } |
| * }; |
| * remove_cvref_t<R> r_; |
| * connect_result_t<S, wrap> state_; |
| * submit_receiver(S&& s, R&& r) |
| * : r_((R&&) r) |
| * , state_(execution::connect((S&&) s, wrap{this})) {} |
| * }; |
| * @endcode |
| */ |
| inline constexpr unspecified submit = unspecified; |
| |
| /// A type trait that determines whether a @c submit expression is |
| /// well-formed. |
| /** |
| * Class template @c can_submit is a trait that is derived from |
| * @c true_type if the expression <tt>execution::submit(std::declval<R>(), |
| * std::declval<E>())</tt> is well formed; otherwise @c false_type. |
| */ |
| template <typename S, typename R> |
| struct can_submit : |
| integral_constant<bool, automatically_determined> |
| { |
| }; |
| |
| } // namespace execution |
| } // namespace asio |
| |
| #else // defined(GENERATING_DOCUMENTATION) |
| |
| namespace asio_execution_submit_fn { |
| |
| using asio::declval; |
| using asio::enable_if; |
| using asio::execution::is_sender_to; |
| using asio::traits::submit_free; |
| using asio::traits::submit_member; |
| |
| void submit(); |
| |
| enum overload_type |
| { |
| call_member, |
| call_free, |
| adapter, |
| ill_formed |
| }; |
| |
| template <typename S, typename R, typename = void, |
| typename = void, typename = void> |
| struct call_traits |
| { |
| ASIO_STATIC_CONSTEXPR(overload_type, overload = ill_formed); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); |
| typedef void result_type; |
| }; |
| |
| template <typename S, typename R> |
| struct call_traits<S, void(R), |
| typename enable_if< |
| submit_member<S, R>::is_valid |
| >::type, |
| typename enable_if< |
| is_sender_to<S, R>::value |
| >::type> : |
| submit_member<S, R> |
| { |
| ASIO_STATIC_CONSTEXPR(overload_type, overload = call_member); |
| }; |
| |
| template <typename S, typename R> |
| struct call_traits<S, void(R), |
| typename enable_if< |
| !submit_member<S, R>::is_valid |
| >::type, |
| typename enable_if< |
| submit_free<S, R>::is_valid |
| >::type, |
| typename enable_if< |
| is_sender_to<S, R>::value |
| >::type> : |
| submit_free<S, R> |
| { |
| ASIO_STATIC_CONSTEXPR(overload_type, overload = call_free); |
| }; |
| |
| template <typename S, typename R> |
| struct call_traits<S, void(R), |
| typename enable_if< |
| !submit_member<S, R>::is_valid |
| >::type, |
| typename enable_if< |
| !submit_free<S, R>::is_valid |
| >::type, |
| typename enable_if< |
| is_sender_to<S, R>::value |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(overload_type, overload = adapter); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); |
| typedef void result_type; |
| }; |
| |
| struct impl |
| { |
| #if defined(ASIO_HAS_MOVE) |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S, void(R)>::overload == call_member, |
| typename call_traits<S, void(R)>::result_type |
| >::type |
| operator()(S&& s, R&& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S, void(R)>::is_noexcept)) |
| { |
| return ASIO_MOVE_CAST(S)(s).submit(ASIO_MOVE_CAST(R)(r)); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S, void(R)>::overload == call_free, |
| typename call_traits<S, void(R)>::result_type |
| >::type |
| operator()(S&& s, R&& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S, void(R)>::is_noexcept)) |
| { |
| return submit(ASIO_MOVE_CAST(S)(s), ASIO_MOVE_CAST(R)(r)); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S, void(R)>::overload == adapter, |
| typename call_traits<S, void(R)>::result_type |
| >::type |
| operator()(S&& s, R&& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S, void(R)>::is_noexcept)) |
| { |
| return asio::execution::start( |
| (new asio::execution::detail::submit_receiver<S, R>( |
| ASIO_MOVE_CAST(S)(s), ASIO_MOVE_CAST(R)(r)))->state_); |
| } |
| #else // defined(ASIO_HAS_MOVE) |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S&, void(R&)>::overload == call_member, |
| typename call_traits<S&, void(R&)>::result_type |
| >::type |
| operator()(S& s, R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S&, void(R&)>::is_noexcept)) |
| { |
| return s.submit(r); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<const S&, void(R&)>::overload == call_member, |
| typename call_traits<const S&, void(R&)>::result_type |
| >::type |
| operator()(const S& s, R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<const S&, void(R&)>::is_noexcept)) |
| { |
| return s.submit(r); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S&, void(R&)>::overload == call_free, |
| typename call_traits<S&, void(R&)>::result_type |
| >::type |
| operator()(S& s, R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S&, void(R&)>::is_noexcept)) |
| { |
| return submit(s, r); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<const S&, void(R&)>::overload == call_free, |
| typename call_traits<const S&, void(R&)>::result_type |
| >::type |
| operator()(const S& s, R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<const S&, void(R&)>::is_noexcept)) |
| { |
| return submit(s, r); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S&, void(R&)>::overload == adapter, |
| typename call_traits<S&, void(R&)>::result_type |
| >::type |
| operator()(S& s, R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S&, void(R&)>::is_noexcept)) |
| { |
| return asio::execution::start( |
| (new asio::execution::detail::submit_receiver< |
| S&, R&>(s, r))->state_); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<const S&, void(R&)>::overload == adapter, |
| typename call_traits<const S&, void(R&)>::result_type |
| >::type |
| operator()(const S& s, R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<const S&, void(R&)>::is_noexcept)) |
| { |
| asio::execution::start( |
| (new asio::execution::detail::submit_receiver< |
| const S&, R&>(s, r))->state_); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S&, void(const R&)>::overload == call_member, |
| typename call_traits<S&, void(const R&)>::result_type |
| >::type |
| operator()(S& s, const R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S&, void(const R&)>::is_noexcept)) |
| { |
| return s.submit(r); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<const S&, void(const R&)>::overload == call_member, |
| typename call_traits<const S&, void(const R&)>::result_type |
| >::type |
| operator()(const S& s, const R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<const S&, void(const R&)>::is_noexcept)) |
| { |
| return s.submit(r); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S&, void(const R&)>::overload == call_free, |
| typename call_traits<S&, void(const R&)>::result_type |
| >::type |
| operator()(S& s, const R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S&, void(const R&)>::is_noexcept)) |
| { |
| return submit(s, r); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<const S&, void(const R&)>::overload == call_free, |
| typename call_traits<const S&, void(const R&)>::result_type |
| >::type |
| operator()(const S& s, const R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<const S&, void(const R&)>::is_noexcept)) |
| { |
| return submit(s, r); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<S&, void(const R&)>::overload == adapter, |
| typename call_traits<S&, void(const R&)>::result_type |
| >::type |
| operator()(S& s, const R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<S&, void(const R&)>::is_noexcept)) |
| { |
| asio::execution::start( |
| (new asio::execution::detail::submit_receiver< |
| S&, const R&>(s, r))->state_); |
| } |
| |
| template <typename S, typename R> |
| ASIO_CONSTEXPR typename enable_if< |
| call_traits<const S&, void(const R&)>::overload == adapter, |
| typename call_traits<const S&, void(const R&)>::result_type |
| >::type |
| operator()(const S& s, const R& r) const |
| ASIO_NOEXCEPT_IF(( |
| call_traits<const S&, void(const R&)>::is_noexcept)) |
| { |
| asio::execution::start( |
| (new asio::execution::detail::submit_receiver< |
| const S&, const R&>(s, r))->state_); |
| } |
| #endif // defined(ASIO_HAS_MOVE) |
| }; |
| |
| template <typename T = impl> |
| struct static_instance |
| { |
| static const T instance; |
| }; |
| |
| template <typename T> |
| const T static_instance<T>::instance = {}; |
| |
| } // namespace asio_execution_submit_fn |
| namespace asio { |
| namespace execution { |
| namespace { |
| |
| static ASIO_CONSTEXPR const asio_execution_submit_fn::impl& |
| submit = asio_execution_submit_fn::static_instance<>::instance; |
| |
| } // namespace |
| |
| template <typename S, typename R> |
| struct can_submit : |
| integral_constant<bool, |
| asio_execution_submit_fn::call_traits<S, void(R)>::overload != |
| asio_execution_submit_fn::ill_formed> |
| { |
| }; |
| |
| #if defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| template <typename S, typename R> |
| constexpr bool can_submit_v = can_submit<S, R>::value; |
| |
| #endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| template <typename S, typename R> |
| struct is_nothrow_submit : |
| integral_constant<bool, |
| asio_execution_submit_fn::call_traits<S, void(R)>::is_noexcept> |
| { |
| }; |
| |
| #if defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| template <typename S, typename R> |
| constexpr bool is_nothrow_submit_v |
| = is_nothrow_submit<S, R>::value; |
| |
| #endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| template <typename S, typename R> |
| struct submit_result |
| { |
| typedef typename asio_execution_submit_fn::call_traits< |
| S, void(R)>::result_type type; |
| }; |
| |
| namespace detail { |
| |
| template <typename S, typename R> |
| void submit_helper(ASIO_MOVE_ARG(S) s, ASIO_MOVE_ARG(R) r) |
| { |
| execution::submit(ASIO_MOVE_CAST(S)(s), ASIO_MOVE_CAST(R)(r)); |
| } |
| |
| } // namespace detail |
| } // namespace execution |
| } // namespace asio |
| |
| #endif // defined(GENERATING_DOCUMENTATION) |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #endif // ASIO_EXECUTION_SUBMIT_HPP |
