dispatch.hpp
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//
// impl/dispatch.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_IMPL_DISPATCH_HPP
#define ASIO_IMPL_DISPATCH_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/associated_allocator.hpp"
#include "asio/associated_executor.hpp"
#include "asio/detail/work_dispatcher.hpp"
#include "asio/execution/allocator.hpp"
#include "asio/execution/blocking.hpp"
#include "asio/prefer.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
class initiate_dispatch
{
public:
template <typename CompletionHandler>
void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
typename enable_if<
execution::is_executor<
typename associated_executor<
typename decay<CompletionHandler>::type
>::type
>::value
>::type* = 0) const
{
typedef typename decay<CompletionHandler>::type handler_t;
typename associated_executor<handler_t>::type ex(
(get_associated_executor)(handler));
typename associated_allocator<handler_t>::type alloc(
(get_associated_allocator)(handler));
execution::execute(
asio::prefer(ex,
execution::blocking.possibly,
execution::allocator(alloc)),
ASIO_MOVE_CAST(CompletionHandler)(handler));
}
template <typename CompletionHandler>
void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
typename enable_if<
!execution::is_executor<
typename associated_executor<
typename decay<CompletionHandler>::type
>::type
>::value
>::type* = 0) const
{
typedef typename decay<CompletionHandler>::type handler_t;
typename associated_executor<handler_t>::type ex(
(get_associated_executor)(handler));
typename associated_allocator<handler_t>::type alloc(
(get_associated_allocator)(handler));
ex.dispatch(ASIO_MOVE_CAST(CompletionHandler)(handler), alloc);
}
};
template <typename Executor>
class initiate_dispatch_with_executor
{
public:
typedef Executor executor_type;
explicit initiate_dispatch_with_executor(const Executor& ex)
: ex_(ex)
{
}
executor_type get_executor() const ASIO_NOEXCEPT
{
return ex_;
}
template <typename CompletionHandler>
void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
typename enable_if<
execution::is_executor<
typename conditional<true, executor_type, CompletionHandler>::type
>::value
&&
!detail::is_work_dispatcher_required<
typename decay<CompletionHandler>::type,
Executor
>::value
>::type* = 0) const
{
typedef typename decay<CompletionHandler>::type handler_t;
typename associated_allocator<handler_t>::type alloc(
(get_associated_allocator)(handler));
execution::execute(
asio::prefer(ex_,
execution::blocking.possibly,
execution::allocator(alloc)),
ASIO_MOVE_CAST(CompletionHandler)(handler));
}
template <typename CompletionHandler>
void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
typename enable_if<
execution::is_executor<
typename conditional<true, executor_type, CompletionHandler>::type
>::value
&&
detail::is_work_dispatcher_required<
typename decay<CompletionHandler>::type,
Executor
>::value
>::type* = 0) const
{
typedef typename decay<CompletionHandler>::type handler_t;
typedef typename associated_executor<
handler_t, Executor>::type handler_ex_t;
handler_ex_t handler_ex((get_associated_executor)(handler, ex_));
typename associated_allocator<handler_t>::type alloc(
(get_associated_allocator)(handler));
execution::execute(
asio::prefer(ex_,
execution::blocking.possibly,
execution::allocator(alloc)),
detail::work_dispatcher<handler_t, handler_ex_t>(
ASIO_MOVE_CAST(CompletionHandler)(handler), handler_ex));
}
template <typename CompletionHandler>
void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
typename enable_if<
!execution::is_executor<
typename conditional<true, executor_type, CompletionHandler>::type
>::value
&&
!detail::is_work_dispatcher_required<
typename decay<CompletionHandler>::type,
Executor
>::value
>::type* = 0) const
{
typedef typename decay<CompletionHandler>::type handler_t;
typename associated_allocator<handler_t>::type alloc(
(get_associated_allocator)(handler));
ex_.dispatch(ASIO_MOVE_CAST(CompletionHandler)(handler), alloc);
}
template <typename CompletionHandler>
void operator()(ASIO_MOVE_ARG(CompletionHandler) handler,
typename enable_if<
!execution::is_executor<
typename conditional<true, executor_type, CompletionHandler>::type
>::value
&&
detail::is_work_dispatcher_required<
typename decay<CompletionHandler>::type,
Executor
>::value
>::type* = 0) const
{
typedef typename decay<CompletionHandler>::type handler_t;
typedef typename associated_executor<
handler_t, Executor>::type handler_ex_t;
handler_ex_t handler_ex((get_associated_executor)(handler, ex_));
typename associated_allocator<handler_t>::type alloc(
(get_associated_allocator)(handler));
ex_.dispatch(detail::work_dispatcher<handler_t, handler_ex_t>(
ASIO_MOVE_CAST(CompletionHandler)(handler),
handler_ex), alloc);
}
private:
Executor ex_;
};
} // namespace detail
template <ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken>
ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) dispatch(
ASIO_MOVE_ARG(CompletionToken) token)
{
return async_initiate<CompletionToken, void()>(
detail::initiate_dispatch(), token);
}
template <typename Executor,
ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken>
ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) dispatch(
const Executor& ex, ASIO_MOVE_ARG(CompletionToken) token,
typename enable_if<
execution::is_executor<Executor>::value || is_executor<Executor>::value
>::type*)
{
return async_initiate<CompletionToken, void()>(
detail::initiate_dispatch_with_executor<Executor>(ex), token);
}
template <typename ExecutionContext,
ASIO_COMPLETION_TOKEN_FOR(void()) CompletionToken>
inline ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, void()) dispatch(
ExecutionContext& ctx, ASIO_MOVE_ARG(CompletionToken) token,
typename enable_if<is_convertible<
ExecutionContext&, execution_context&>::value>::type*)
{
return async_initiate<CompletionToken, void()>(
detail::initiate_dispatch_with_executor<
typename ExecutionContext::executor_type>(
ctx.get_executor()), token);
}
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_IMPL_DISPATCH_HPP