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//
// impl/compose.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 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_IMPL_COMPOSE_HPP
#define BOOST_ASIO_IMPL_COMPOSE_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/handler_alloc_helpers.hpp>
#include <boost/asio/detail/handler_cont_helpers.hpp>
#include <boost/asio/detail/handler_invoke_helpers.hpp>
#include <boost/asio/detail/type_traits.hpp>
#include <boost/asio/detail/variadic_templates.hpp>
#include <boost/asio/executor_work_guard.hpp>
#include <boost/asio/is_executor.hpp>
#include <boost/asio/system_executor.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail
{
template <typename>
struct composed_work;
template <>
struct composed_work<void()>
{
composed_work() BOOST_ASIO_NOEXCEPT
: head_(system_executor())
{
}
void reset()
{
head_.reset();
}
typedef system_executor head_type;
executor_work_guard<system_executor> head_;
};
inline composed_work<void()> make_composed_work()
{
return composed_work<void()>();
}
template <typename Head>
struct composed_work<void(Head)>
{
explicit composed_work(const Head& ex) BOOST_ASIO_NOEXCEPT
: head_(ex)
{
}
void reset()
{
head_.reset();
}
typedef Head head_type;
executor_work_guard<Head> head_;
};
template <typename Head>
inline composed_work<void(Head)> make_composed_work(const Head& head)
{
return composed_work<void(Head)>(head);
}
#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
template <typename Head, typename... Tail>
struct composed_work<void(Head, Tail...)>
{
explicit composed_work(const Head& head,
const Tail&... tail) BOOST_ASIO_NOEXCEPT
: head_(head),
tail_(tail...)
{
}
void reset()
{
head_.reset();
tail_.reset();
}
typedef Head head_type;
executor_work_guard<Head> head_;
composed_work<void(Tail...)> tail_;
};
template <typename Head, typename... Tail>
inline composed_work<void(Head, Tail...)>
make_composed_work(const Head& head, const Tail&... tail)
{
return composed_work<void(Head, Tail...)>(head, tail...);
}
#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
#define BOOST_ASIO_PRIVATE_COMPOSED_WORK_DEF(n) \
template <typename Head, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
struct composed_work<void(Head, BOOST_ASIO_VARIADIC_TARGS(n))> \
{ \
explicit composed_work(const Head& head, \
BOOST_ASIO_VARIADIC_CONSTREF_PARAMS(n)) BOOST_ASIO_NOEXCEPT \
: head_(head), \
tail_(BOOST_ASIO_VARIADIC_BYVAL_ARGS(n)) \
{ \
} \
\
void reset() \
{ \
head_.reset(); \
tail_.reset(); \
} \
\
typedef Head head_type; \
executor_work_guard<Head> head_; \
composed_work<void(BOOST_ASIO_VARIADIC_TARGS(n))> tail_; \
}; \
\
template <typename Head, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
inline composed_work<void(Head, BOOST_ASIO_VARIADIC_TARGS(n))> \
make_composed_work(const Head& head, BOOST_ASIO_VARIADIC_CONSTREF_PARAMS(n)) \
{ \
return composed_work< \
void(Head, BOOST_ASIO_VARIADIC_TARGS(n))>( \
head, BOOST_ASIO_VARIADIC_BYVAL_ARGS(n)); \
} \
/**/
BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_COMPOSED_WORK_DEF)
#undef BOOST_ASIO_PRIVATE_COMPOSED_WORK_DEF
#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
#if defined(BOOST_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(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
template <typename Impl, typename Work, typename Handler, typename Signature>
class composed_op
#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
{
public:
composed_op(BOOST_ASIO_MOVE_ARG(Impl) impl,
BOOST_ASIO_MOVE_ARG(Work) work,
BOOST_ASIO_MOVE_ARG(Handler) handler)
: impl_(BOOST_ASIO_MOVE_CAST(Impl)(impl)),
work_(BOOST_ASIO_MOVE_CAST(Work)(work)),
handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)),
invocations_(0)
{
}
#if defined(BOOST_ASIO_HAS_MOVE)
composed_op(composed_op&& other)
: impl_(BOOST_ASIO_MOVE_CAST(Impl)(other.impl_)),
work_(BOOST_ASIO_MOVE_CAST(Work)(other.work_)),
handler_(BOOST_ASIO_MOVE_CAST(Handler)(other.handler_)),
invocations_(other.invocations_)
{
}
#endif // defined(BOOST_ASIO_HAS_MOVE)
typedef typename associated_executor<Handler,
typename Work::head_type>::type executor_type;
executor_type get_executor() const BOOST_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 BOOST_ASIO_NOEXCEPT
{
return (get_associated_allocator)(handler_, std::allocator<void>());
}
#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
template<typename... T>
void operator()(BOOST_ASIO_MOVE_ARG(T)... t)
{
if (invocations_ < ~unsigned(0))
++invocations_;
impl_(*this, BOOST_ASIO_MOVE_CAST(T)(t)...);
}
void complete(Args... args)
{
this->work_.reset();
this->handler_(BOOST_ASIO_MOVE_CAST(Args)(args)...);
}
#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
void operator()()
{
if (invocations_ < ~unsigned(0))
++invocations_;
impl_(*this);
}
void complete()
{
this->work_.reset();
this->handler_();
}
#define BOOST_ASIO_PRIVATE_COMPOSED_OP_DEF(n) \
template<BOOST_ASIO_VARIADIC_TPARAMS(n)> \
void operator()(BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
{ \
if (invocations_ < ~unsigned(0)) \
++invocations_; \
impl_(*this, BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
} \
\
template<BOOST_ASIO_VARIADIC_TPARAMS(n)> \
void complete(BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
{ \
this->work_.reset(); \
this->handler_(BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
} \
/**/
BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_COMPOSED_OP_DEF)
#undef BOOST_ASIO_PRIVATE_COMPOSED_OP_DEF
#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
//private:
Impl impl_;
Work work_;
Handler handler_;
unsigned invocations_;
};
template <typename Impl, typename Work, typename Handler, typename Signature>
inline void* asio_handler_allocate(std::size_t size,
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
return boost_asio_handler_alloc_helpers::allocate(
size, this_handler->handler_);
}
template <typename Impl, typename Work, typename Handler, typename Signature>
inline void asio_handler_deallocate(void* pointer, std::size_t size,
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
boost_asio_handler_alloc_helpers::deallocate(
pointer, size, this_handler->handler_);
}
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
: boost_asio_handler_cont_helpers::is_continuation(
this_handler->handler_);
}
template <typename Function, typename Impl,
typename Work, typename Handler, typename Signature>
inline void asio_handler_invoke(Function& function,
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
boost_asio_handler_invoke_helpers::invoke(
function, this_handler->handler_);
}
template <typename Function, typename Impl,
typename Work, typename Handler, typename Signature>
inline void asio_handler_invoke(const Function& function,
composed_op<Impl, Work, Handler, Signature>* this_handler)
{
boost_asio_handler_invoke_helpers::invoke(
function, this_handler->handler_);
}
template <typename Signature>
struct initiate_composed_op
{
template <typename Handler, typename Impl, typename Work>
void operator()(BOOST_ASIO_MOVE_ARG(Handler) handler,
BOOST_ASIO_MOVE_ARG(Impl) impl,
BOOST_ASIO_MOVE_ARG(Work) work) const
{
composed_op<typename decay<Impl>::type, typename decay<Work>::type,
typename decay<Handler>::type, Signature>(
BOOST_ASIO_MOVE_CAST(Impl)(impl), BOOST_ASIO_MOVE_CAST(Work)(work),
BOOST_ASIO_MOVE_CAST(Handler)(handler))();
}
};
template <typename IoObject>
inline typename IoObject::executor_type
get_composed_io_executor(IoObject& io_object)
{
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>::type* = 0)
{
return ex;
}
} // namespace detail
#if !defined(GENERATING_DOCUMENTATION)
#if defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
template <typename CompletionToken, typename Signature,
typename Implementation, typename... IoObjectsOrExecutors>
BOOST_ASIO_INITFN_RESULT_TYPE(CompletionToken, Signature)
async_compose(BOOST_ASIO_MOVE_ARG(Implementation) implementation,
BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token,
BOOST_ASIO_MOVE_ARG(IoObjectsOrExecutors)... io_objects_or_executors)
{
return async_initiate<CompletionToken, Signature>(
detail::initiate_composed_op<Signature>(), token,
BOOST_ASIO_MOVE_CAST(Implementation)(implementation),
detail::make_composed_work(
detail::get_composed_io_executor(
BOOST_ASIO_MOVE_CAST(IoObjectsOrExecutors)(
io_objects_or_executors))...));
}
#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
template <typename CompletionToken, typename Signature, typename Implementation>
BOOST_ASIO_INITFN_RESULT_TYPE(CompletionToken, Signature)
async_compose(BOOST_ASIO_MOVE_ARG(Implementation) implementation,
BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token)
{
return async_initiate<CompletionToken, Signature>(
detail::initiate_composed_op<Signature>(), token,
BOOST_ASIO_MOVE_CAST(Implementation)(implementation),
detail::make_composed_work());
}
# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n) \
BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_##n
# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_1 \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1))
# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_2 \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T2)(x2))
# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_3 \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T3)(x3))
# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_4 \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T3)(x3)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T4)(x4))
# define BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_5 \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T1)(x1)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T2)(x2)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T3)(x3)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T4)(x4)), \
detail::get_composed_io_executor(BOOST_ASIO_MOVE_CAST(T5)(x5))
#define BOOST_ASIO_PRIVATE_ASYNC_COMPOSE_DEF(n) \
template <typename CompletionToken, typename Signature, \
typename Implementation, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
BOOST_ASIO_INITFN_RESULT_TYPE(CompletionToken, Signature) \
async_compose(BOOST_ASIO_MOVE_ARG(Implementation) implementation, \
BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token, \
BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
{ \
return async_initiate<CompletionToken, Signature>( \
detail::initiate_composed_op<Signature>(), token, \
BOOST_ASIO_MOVE_CAST(Implementation)(implementation), \
detail::make_composed_work( \
BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR(n))); \
} \
/**/
BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_ASYNC_COMPOSE_DEF)
#undef BOOST_ASIO_PRIVATE_ASYNC_COMPOSE_DEF
#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR
#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_1
#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_2
#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_3
#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_4
#undef BOOST_ASIO_PRIVATE_GET_COMPOSED_IO_EXECUTOR_5
#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
#endif // !defined(GENERATING_DOCUMENTATION)
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_IMPL_COMPOSE_HPP
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