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Diffstat (limited to 'boost/asio/impl/compose.hpp')
| -rw-r--r-- | boost/asio/impl/compose.hpp | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/boost/asio/impl/compose.hpp b/boost/asio/impl/compose.hpp new file mode 100644 index 0000000000..76fe54d066 --- /dev/null +++ b/boost/asio/impl/compose.hpp @@ -0,0 +1,421 @@ +// +// 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 |