submit.hpp
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//
// 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>
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
&&
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
&&
submit_free<S, R>::is_valid
&&
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
&&
!submit_free<S, R>::is_valid
&&
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