compose.hpp
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//
// impl/compose.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_COMPOSE_HPP
#define ASIO_IMPL_COMPOSE_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_executor.hpp"
#include "asio/detail/handler_alloc_helpers.hpp"
#include "asio/detail/handler_cont_helpers.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"
#include "asio/detail/type_traits.hpp"
#include "asio/detail/variadic_templates.hpp"
#include "asio/execution/executor.hpp"
#include "asio/execution/outstanding_work.hpp"
#include "asio/executor_work_guard.hpp"
#include "asio/is_executor.hpp"
#include "asio/system_executor.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail
{
template <typename Executor, typename = void>
class composed_work_guard
{
public:
typedef typename decay<
typename prefer_result<Executor,
execution::outstanding_work_t::tracked_t
>::type
>::type executor_type;
composed_work_guard(const Executor& ex)
: executor_(asio::prefer(ex, execution::outstanding_work.tracked))
{
}
void reset()
{
}
executor_type get_executor() const ASIO_NOEXCEPT
{
return executor_;
}
private:
executor_type executor_;
};
#if !defined(ASIO_NO_TS_EXECUTORS)
template <typename Executor>
struct composed_work_guard<Executor,
typename enable_if<
!execution::is_executor<Executor>::value
>::type> : executor_work_guard<Executor>
{
composed_work_guard(const Executor& ex)
: executor_work_guard<Executor>(ex)
{
}
};
#endif // !defined(ASIO_NO_TS_EXECUTORS)
template <typename>
struct composed_io_executors;
template <>
struct composed_io_executors<void()>
{
composed_io_executors() ASIO_NOEXCEPT
: head_(system_executor())
{
}
typedef system_executor head_type;
system_executor head_;
};
inline composed_io_executors<void()> make_composed_io_executors()
{
return composed_io_executors<void()>();
}
template <typename Head>
struct composed_io_executors<void(Head)>
{
explicit composed_io_executors(const Head& ex) ASIO_NOEXCEPT
: head_(ex)
{
}
typedef Head head_type;
Head head_;
};
template <typename Head>
inline composed_io_executors<void(Head)>
make_composed_io_executors(const Head& head)
{
return composed_io_executors<void(Head)>(head);
}
#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
template <typename Head, typename... Tail>
struct composed_io_executors<void(Head, Tail...)>
{
explicit composed_io_executors(const Head& head,
const Tail&... tail) ASIO_NOEXCEPT
: head_(head),
tail_(tail...)
{
}
void reset()
{
head_.reset();
tail_.reset();
}
typedef Head head_type;
Head head_;
composed_io_executors<void(Tail...)> tail_;
};
template <typename Head, typename... Tail>
inline composed_io_executors<void(Head, Tail...)>
make_composed_io_executors(const Head& head, const Tail&... tail)
{
return composed_io_executors<void(Head, Tail...)>(head, tail...);
}
#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
#define ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF(n) \
template <typename Head, ASIO_VARIADIC_TPARAMS(n)> \
struct composed_io_executors<void(Head, ASIO_VARIADIC_TARGS(n))> \
{ \
explicit composed_io_executors(const Head& head, \
ASIO_VARIADIC_CONSTREF_PARAMS(n)) ASIO_NOEXCEPT \
: head_(head), \
tail_(ASIO_VARIADIC_BYVAL_ARGS(n)) \
{ \
} \
\
void reset() \
{ \
head_.reset(); \
tail_.reset(); \
} \
\
typedef Head head_type; \
Head head_; \
composed_io_executors<void(ASIO_VARIADIC_TARGS(n))> tail_; \
}; \
\
template <typename Head, ASIO_VARIADIC_TPARAMS(n)> \
inline composed_io_executors<void(Head, ASIO_VARIADIC_TARGS(n))> \
make_composed_io_executors(const Head& head, \
ASIO_VARIADIC_CONSTREF_PARAMS(n)) \
{ \
return composed_io_executors< \
void(Head, ASIO_VARIADIC_TARGS(n))>( \
head, ASIO_VARIADIC_BYVAL_ARGS(n)); \
} \
/**/
ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF)
#undef ASIO_PRIVATE_COMPOSED_IO_EXECUTORS_DEF
#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
template <typename>
struct composed_work;
template <>
struct composed_work<void()>
{
typedef composed_io_executors<void()> executors_type;
composed_work(const executors_type&) ASIO_NOEXCEPT
: head_(system_executor())
{
}
void reset()
{
head_.reset();
}
typedef system_executor head_type;
composed_work_guard<system_executor> head_;
};
template <typename Head>
struct composed_work<void(Head)>
{
typedef composed_io_executors<void(Head)> executors_type;
explicit composed_work(const executors_type& ex) ASIO_NOEXCEPT
: head_(ex.head_)
{
}
void reset()
{
head_.reset();
}
typedef Head head_type;
composed_work_guard<Head> head_;
};
#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
template <typename Head, typename... Tail>
struct composed_work<void(Head, Tail...)>
{
typedef composed_io_executors<void(Head, Tail...)> executors_type;
explicit composed_work(const executors_type& ex) ASIO_NOEXCEPT
: head_(ex.head_),
tail_(ex.tail_)
{
}
void reset()
{
head_.reset();
tail_.reset();
}
typedef Head head_type;
composed_work_guard<Head> head_;
composed_work<void(Tail...)> tail_;
};
#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
#define ASIO_PRIVATE_COMPOSED_WORK_DEF(n) \
template <typename Head, ASIO_VARIADIC_TPARAMS(n)> \
struct composed_work<void(Head, ASIO_VARIADIC_TARGS(n))> \
{ \
typedef composed_io_executors<void(Head, \
ASIO_VARIADIC_TARGS(n))> executors_type; \
\
explicit composed_work(const executors_type& ex) ASIO_NOEXCEPT \
: head_(ex.head_), \
tail_(ex.tail_) \
{ \
} \
\
void reset() \
{ \
head_.reset(); \
tail_.reset(); \
} \
\
typedef Head head_type; \
composed_work_guard<Head> head_; \
composed_work<void(ASIO_VARIADIC_TARGS(n))> tail_; \
}; \
/**/
ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_COMPOSED_WORK_DEF)
#undef ASIO_PRIVATE_COMPOSED_WORK_DEF
#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
template <typename Impl, typename Work, typename Handler, typename Signature>
class composed_op;
template <typename Impl, typename Work, typename Handler,
typename R, typename... Args>
class composed_op<Impl, Work, Handler, R(Args...)>
#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
template <typename Impl, typename Work, typename Handler, typename Signature>
class composed_op
#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
{
public:
template <typename I, typename W, typename H>
composed_op(ASIO_MOVE_ARG(I) impl,
ASIO_MOVE_ARG(W) work,
ASIO_MOVE_ARG(H) handler)
: impl_(ASIO_MOVE_CAST(I)(impl)),
work_(ASIO_MOVE_CAST(W)(work)),
handler_(ASIO_MOVE_CAST(H)(handler)),
invocations_(0)
{
}
#if defined(ASIO_HAS_MOVE)
composed_op(composed_op&& other)
: impl_(ASIO_MOVE_CAST(Impl)(other.impl_)),
work_(ASIO_MOVE_CAST(Work)(other.work_)),
handler_(ASIO_MOVE_CAST(Handler)(other.handler_)),
invocations_(other.invocations_)
{
}
#endif // defined(ASIO_HAS_MOVE)
typedef typename associated_executor<Handler,
typename composed_work_guard<
typename Work::head_type
>::executor_type
>::type executor_type;
executor_type get_executor() const ASIO_NOEXCEPT
{
return (get_associated_executor)(handler_, work_.head_.get_executor());
}
typedef typename associated_allocator<Handler,
std::allocator<void> >::type allocator_type;
allocator_type get_allocator() const ASIO_NOEXCEPT
{
return (get_associated_allocator)(handler_, std::allocator<void>());
}
#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
template<typename... T>
void operator()(ASIO_MOVE_ARG(T)... t)
{
if (invocations_ < ~0u)
++invocations_;
impl_(*this, ASIO_MOVE_CAST(T)(t)...);
}
void complete(Args... args)
{
this->work_.reset();
this->handler_(ASIO_MOVE_CAST(Args)(args)...);
}
#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
void operator()()
{
if (invocations_ < ~0u)
++invocations_;
impl_(*this);
}
void complete()
{
this->work_.reset();
this->handler_();
}
#define ASIO_PRIVATE_COMPOSED_OP_DEF(n) \
template<ASIO_VARIADIC_TPARAMS(n)> \
void operator()(ASIO_VARIADIC_MOVE_PARAMS(n)) \
{ \
if (invocations_ < ~0u) \
++invocations_; \
impl_(*this, ASIO_VARIADIC_MOVE_ARGS(n)); \
} \
\
template<ASIO_VARIADIC_TPARAMS(n)> \
void complete(ASIO_VARIADIC_MOVE_PARAMS(n)) \
{ \
this->work_.reset(); \
this->handler_(ASIO_VARIADIC_MOVE_ARGS(n)); \
} \
/**/
ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_COMPOSED_OP_DEF)
#undef ASIO_PRIVATE_COMPOSED_OP_DEF
#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
//private:
Impl impl_;
Work work_;
Handler handler_;
unsigned invocations_;
};
template <typename Impl, typename Work, typename Handler, typename Signature>
inline asio_handler_allocate_is_deprecated
asio_handler_allocate(std::size_t size,
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
#if defined(ASIO_NO_DEPRECATED)
asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
return asio_handler_allocate_is_no_longer_used();
#else // defined(ASIO_NO_DEPRECATED)
return asio_handler_alloc_helpers::allocate(
size, this_handler->handler_);
#endif // defined(ASIO_NO_DEPRECATED)
}
template <typename Impl, typename Work, typename Handler, typename Signature>
inline asio_handler_deallocate_is_deprecated
asio_handler_deallocate(void* pointer, std::size_t size,
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
asio_handler_alloc_helpers::deallocate(
pointer, size, this_handler->handler_);
#if defined(ASIO_NO_DEPRECATED)
return asio_handler_deallocate_is_no_longer_used();
#endif // defined(ASIO_NO_DEPRECATED)
}
template <typename Impl, typename Work, typename Handler, typename Signature>
inline bool asio_handler_is_continuation(
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
return this_handler->invocations_ > 1 ? true
: asio_handler_cont_helpers::is_continuation(
this_handler->handler_);
}
template <typename Function, typename Impl,
typename Work, typename Handler, typename Signature>
inline asio_handler_invoke_is_deprecated
asio_handler_invoke(Function& function,
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
asio_handler_invoke_helpers::invoke(
function, this_handler->handler_);
#if defined(ASIO_NO_DEPRECATED)
return asio_handler_invoke_is_no_longer_used();
#endif // defined(ASIO_NO_DEPRECATED)
}
template <typename Function, typename Impl,
typename Work, typename Handler, typename Signature>
inline asio_handler_invoke_is_deprecated
asio_handler_invoke(const Function& function,
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
asio_handler_invoke_helpers::invoke(
function, this_handler->handler_);
#if defined(ASIO_NO_DEPRECATED)
return asio_handler_invoke_is_no_longer_used();
#endif // defined(ASIO_NO_DEPRECATED)
}
template <typename Signature, typename Executors>
class initiate_composed_op
{
public:
typedef typename composed_io_executors<Executors>::head_type executor_type;
template <typename T>
explicit initiate_composed_op(int, ASIO_MOVE_ARG(T) executors)
: executors_(ASIO_MOVE_CAST(T)(executors))
{
}
executor_type get_executor() const ASIO_NOEXCEPT
{
return executors_.head_;
}
template <typename Handler, typename Impl>
void operator()(ASIO_MOVE_ARG(Handler) handler,
ASIO_MOVE_ARG(Impl) impl) const
{
composed_op<typename decay<Impl>::type, composed_work<Executors>,
typename decay<Handler>::type, Signature>(
ASIO_MOVE_CAST(Impl)(impl),
composed_work<Executors>(executors_),
ASIO_MOVE_CAST(Handler)(handler))();
}
private:
composed_io_executors<Executors> executors_;
};
template <typename Signature, typename Executors>
inline initiate_composed_op<Signature, Executors> make_initiate_composed_op(
ASIO_MOVE_ARG(composed_io_executors<Executors>) executors)
{
return initiate_composed_op<Signature, Executors>(0,
ASIO_MOVE_CAST(composed_io_executors<Executors>)(executors));
}
template <typename IoObject>
inline typename IoObject::executor_type
get_composed_io_executor(IoObject& io_object,
typename enable_if<
!is_executor<IoObject>::value
&& !execution::is_executor<IoObject>::value
>::type* = 0)
{
return io_object.get_executor();
}
template <typename Executor>
inline const Executor& get_composed_io_executor(const Executor& ex,
typename enable_if<
is_executor<Executor>::value
|| execution::is_executor<Executor>::value
>::type* = 0)
{
return ex;
}
} // namespace detail
#if !defined(GENERATING_DOCUMENTATION)
#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
template <typename CompletionToken, typename Signature,
typename Implementation, typename... IoObjectsOrExecutors>
ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, Signature)
async_compose(ASIO_MOVE_ARG(Implementation) implementation,
ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token,
ASIO_MOVE_ARG(IoObjectsOrExecutors)... io_objects_or_executors)
{
return async_initiate<CompletionToken, Signature>(
detail::make_initiate_composed_op<Signature>(
detail::make_composed_io_executors(
detail::get_composed_io_executor(
ASIO_MOVE_CAST(IoObjectsOrExecutors)(
io_objects_or_executors))...)),
token, ASIO_MOVE_CAST(Implementation)(implementation));
}
#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
template <typename CompletionToken, typename Signature, typename Implementation>
ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, Signature)
async_compose(ASIO_MOVE_ARG(Implementation) implementation,
ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token)
{
return async_initiate<CompletionToken, Signature>(
detail::make_initiate_composed_op<Signature>(
detail::make_composed_io_executors()),
token, ASIO_MOVE_CAST(Implementation)(implementation));
}
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n) \
ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_##n
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_1 \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1))
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_2 \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2))
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_3 \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3))
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_4 \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4))
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_5 \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T5)(x5))
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_6 \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T5)(x5)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T6)(x6))
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_7 \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T5)(x5)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T6)(x6)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T7)(x7))
# define ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_8 \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T3)(x3)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T4)(x4)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T5)(x5)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T6)(x6)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T7)(x7)), \
detail::get_composed_io_executor(ASIO_MOVE_CAST(T8)(x8))
#define ASIO_PRIVATE_ASYNC_COMPOSE_DEF(n) \
template <typename CompletionToken, typename Signature, \
typename Implementation, ASIO_VARIADIC_TPARAMS(n)> \
ASIO_INITFN_AUTO_RESULT_TYPE(CompletionToken, Signature) \
async_compose(ASIO_MOVE_ARG(Implementation) implementation, \
ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token, \
ASIO_VARIADIC_MOVE_PARAMS(n)) \
{ \
return async_initiate<CompletionToken, Signature>( \
detail::make_initiate_composed_op<Signature>( \
detail::make_composed_io_executors( \
ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n))), \
token, ASIO_MOVE_CAST(Implementation)(implementation)); \
} \
/**/
ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_ASYNC_COMPOSE_DEF)
#undef ASIO_PRIVATE_ASYNC_COMPOSE_DEF
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_1
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_2
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_3
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_4
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_5
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_6
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_7
#undef ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_8
#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
#endif // !defined(GENERATING_DOCUMENTATION)
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_IMPL_COMPOSE_HPP