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Diffstat (limited to '3rdparty/asio/include/asio/impl/read_at.hpp')
-rw-r--r-- | 3rdparty/asio/include/asio/impl/read_at.hpp | 733 |
1 files changed, 733 insertions, 0 deletions
diff --git a/3rdparty/asio/include/asio/impl/read_at.hpp b/3rdparty/asio/include/asio/impl/read_at.hpp new file mode 100644 index 00000000000..7d37c4ddfa4 --- /dev/null +++ b/3rdparty/asio/include/asio/impl/read_at.hpp @@ -0,0 +1,733 @@ +// +// impl/read_at.hpp +// ~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2021 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_READ_AT_HPP +#define ASIO_IMPL_READ_AT_HPP + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) + +#include <algorithm> +#include "asio/associator.hpp" +#include "asio/buffer.hpp" +#include "asio/completion_condition.hpp" +#include "asio/detail/array_fwd.hpp" +#include "asio/detail/base_from_cancellation_state.hpp" +#include "asio/detail/base_from_completion_cond.hpp" +#include "asio/detail/bind_handler.hpp" +#include "asio/detail/consuming_buffers.hpp" +#include "asio/detail/dependent_type.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/handler_tracking.hpp" +#include "asio/detail/handler_type_requirements.hpp" +#include "asio/detail/non_const_lvalue.hpp" +#include "asio/detail/throw_error.hpp" +#include "asio/error.hpp" + +#include "asio/detail/push_options.hpp" + +namespace asio { + +namespace detail +{ + template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence, + typename MutableBufferIterator, typename CompletionCondition> + std::size_t read_at_buffer_sequence(SyncRandomAccessReadDevice& d, + uint64_t offset, const MutableBufferSequence& buffers, + const MutableBufferIterator&, CompletionCondition completion_condition, + asio::error_code& ec) + { + ec = asio::error_code(); + asio::detail::consuming_buffers<mutable_buffer, + MutableBufferSequence, MutableBufferIterator> tmp(buffers); + while (!tmp.empty()) + { + if (std::size_t max_size = detail::adapt_completion_condition_result( + completion_condition(ec, tmp.total_consumed()))) + { + tmp.consume(d.read_some_at(offset + tmp.total_consumed(), + tmp.prepare(max_size), ec)); + } + else + break; + } + return tmp.total_consumed(); + } +} // namespace detail + +template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence, + typename CompletionCondition> +std::size_t read_at(SyncRandomAccessReadDevice& d, + uint64_t offset, const MutableBufferSequence& buffers, + CompletionCondition completion_condition, asio::error_code& ec) +{ + return detail::read_at_buffer_sequence(d, offset, buffers, + asio::buffer_sequence_begin(buffers), + ASIO_MOVE_CAST(CompletionCondition)(completion_condition), ec); +} + +template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence> +inline std::size_t read_at(SyncRandomAccessReadDevice& d, + uint64_t offset, const MutableBufferSequence& buffers) +{ + asio::error_code ec; + std::size_t bytes_transferred = read_at( + d, offset, buffers, transfer_all(), ec); + asio::detail::throw_error(ec, "read_at"); + return bytes_transferred; +} + +template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence> +inline std::size_t read_at(SyncRandomAccessReadDevice& d, + uint64_t offset, const MutableBufferSequence& buffers, + asio::error_code& ec) +{ + return read_at(d, offset, buffers, transfer_all(), ec); +} + +template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence, + typename CompletionCondition> +inline std::size_t read_at(SyncRandomAccessReadDevice& d, + uint64_t offset, const MutableBufferSequence& buffers, + CompletionCondition completion_condition) +{ + asio::error_code ec; + std::size_t bytes_transferred = read_at(d, offset, buffers, + ASIO_MOVE_CAST(CompletionCondition)(completion_condition), ec); + asio::detail::throw_error(ec, "read_at"); + return bytes_transferred; +} + +#if !defined(ASIO_NO_EXTENSIONS) +#if !defined(ASIO_NO_IOSTREAM) + +template <typename SyncRandomAccessReadDevice, typename Allocator, + typename CompletionCondition> +std::size_t read_at(SyncRandomAccessReadDevice& d, + uint64_t offset, asio::basic_streambuf<Allocator>& b, + CompletionCondition completion_condition, asio::error_code& ec) +{ + ec = asio::error_code(); + std::size_t total_transferred = 0; + std::size_t max_size = detail::adapt_completion_condition_result( + completion_condition(ec, total_transferred)); + std::size_t bytes_available = read_size_helper(b, max_size); + while (bytes_available > 0) + { + std::size_t bytes_transferred = d.read_some_at( + offset + total_transferred, b.prepare(bytes_available), ec); + b.commit(bytes_transferred); + total_transferred += bytes_transferred; + max_size = detail::adapt_completion_condition_result( + completion_condition(ec, total_transferred)); + bytes_available = read_size_helper(b, max_size); + } + return total_transferred; +} + +template <typename SyncRandomAccessReadDevice, typename Allocator> +inline std::size_t read_at(SyncRandomAccessReadDevice& d, + uint64_t offset, asio::basic_streambuf<Allocator>& b) +{ + asio::error_code ec; + std::size_t bytes_transferred = read_at( + d, offset, b, transfer_all(), ec); + asio::detail::throw_error(ec, "read_at"); + return bytes_transferred; +} + +template <typename SyncRandomAccessReadDevice, typename Allocator> +inline std::size_t read_at(SyncRandomAccessReadDevice& d, + uint64_t offset, asio::basic_streambuf<Allocator>& b, + asio::error_code& ec) +{ + return read_at(d, offset, b, transfer_all(), ec); +} + +template <typename SyncRandomAccessReadDevice, typename Allocator, + typename CompletionCondition> +inline std::size_t read_at(SyncRandomAccessReadDevice& d, + uint64_t offset, asio::basic_streambuf<Allocator>& b, + CompletionCondition completion_condition) +{ + asio::error_code ec; + std::size_t bytes_transferred = read_at(d, offset, b, + ASIO_MOVE_CAST(CompletionCondition)(completion_condition), ec); + asio::detail::throw_error(ec, "read_at"); + return bytes_transferred; +} + +#endif // !defined(ASIO_NO_IOSTREAM) +#endif // !defined(ASIO_NO_EXTENSIONS) + +namespace detail +{ + template <typename AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename MutableBufferIterator, + typename CompletionCondition, typename ReadHandler> + class read_at_op + : public base_from_cancellation_state<ReadHandler>, + base_from_completion_cond<CompletionCondition> + { + public: + read_at_op(AsyncRandomAccessReadDevice& device, + uint64_t offset, const MutableBufferSequence& buffers, + CompletionCondition& completion_condition, ReadHandler& handler) + : base_from_cancellation_state<ReadHandler>( + handler, enable_partial_cancellation()), + base_from_completion_cond<CompletionCondition>(completion_condition), + device_(device), + offset_(offset), + buffers_(buffers), + start_(0), + handler_(ASIO_MOVE_CAST(ReadHandler)(handler)) + { + } + +#if defined(ASIO_HAS_MOVE) + read_at_op(const read_at_op& other) + : base_from_cancellation_state<ReadHandler>(other), + base_from_completion_cond<CompletionCondition>(other), + device_(other.device_), + offset_(other.offset_), + buffers_(other.buffers_), + start_(other.start_), + handler_(other.handler_) + { + } + + read_at_op(read_at_op&& other) + : base_from_cancellation_state<ReadHandler>( + ASIO_MOVE_CAST(base_from_cancellation_state< + ReadHandler>)(other)), + base_from_completion_cond<CompletionCondition>( + ASIO_MOVE_CAST(base_from_completion_cond< + CompletionCondition>)(other)), + device_(other.device_), + offset_(other.offset_), + buffers_(ASIO_MOVE_CAST(buffers_type)(other.buffers_)), + start_(other.start_), + handler_(ASIO_MOVE_CAST(ReadHandler)(other.handler_)) + { + } +#endif // defined(ASIO_HAS_MOVE) + + void operator()(asio::error_code ec, + std::size_t bytes_transferred, int start = 0) + { + std::size_t max_size; + switch (start_ = start) + { + case 1: + max_size = this->check_for_completion(ec, buffers_.total_consumed()); + for (;;) + { + { + ASIO_HANDLER_LOCATION((__FILE__, __LINE__, "async_read_at")); + device_.async_read_some_at( + offset_ + buffers_.total_consumed(), buffers_.prepare(max_size), + ASIO_MOVE_CAST(read_at_op)(*this)); + } + return; default: + buffers_.consume(bytes_transferred); + if ((!ec && bytes_transferred == 0) || buffers_.empty()) + break; + max_size = this->check_for_completion(ec, buffers_.total_consumed()); + if (max_size == 0) + break; + if (this->cancelled() != cancellation_type::none) + { + ec = asio::error::operation_aborted; + break; + } + } + + ASIO_MOVE_OR_LVALUE(ReadHandler)(handler_)( + static_cast<const asio::error_code&>(ec), + static_cast<const std::size_t&>(buffers_.total_consumed())); + } + } + + //private: + typedef asio::detail::consuming_buffers<mutable_buffer, + MutableBufferSequence, MutableBufferIterator> buffers_type; + + AsyncRandomAccessReadDevice& device_; + uint64_t offset_; + buffers_type buffers_; + int start_; + ReadHandler handler_; + }; + + template <typename AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename MutableBufferIterator, + typename CompletionCondition, typename ReadHandler> + inline asio_handler_allocate_is_deprecated + asio_handler_allocate(std::size_t size, + read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence, + MutableBufferIterator, CompletionCondition, ReadHandler>* 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 AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename MutableBufferIterator, + typename CompletionCondition, typename ReadHandler> + inline asio_handler_deallocate_is_deprecated + asio_handler_deallocate(void* pointer, std::size_t size, + read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence, + MutableBufferIterator, CompletionCondition, ReadHandler>* 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 AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename MutableBufferIterator, + typename CompletionCondition, typename ReadHandler> + inline bool asio_handler_is_continuation( + read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence, + MutableBufferIterator, CompletionCondition, ReadHandler>* this_handler) + { + return this_handler->start_ == 0 ? true + : asio_handler_cont_helpers::is_continuation( + this_handler->handler_); + } + + template <typename Function, typename AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename MutableBufferIterator, + typename CompletionCondition, typename ReadHandler> + inline asio_handler_invoke_is_deprecated + asio_handler_invoke(Function& function, + read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence, + MutableBufferIterator, CompletionCondition, ReadHandler>* 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 AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename MutableBufferIterator, + typename CompletionCondition, typename ReadHandler> + inline asio_handler_invoke_is_deprecated + asio_handler_invoke(const Function& function, + read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence, + MutableBufferIterator, CompletionCondition, ReadHandler>* 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 AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename MutableBufferIterator, + typename CompletionCondition, typename ReadHandler> + inline void start_read_at_buffer_sequence_op(AsyncRandomAccessReadDevice& d, + uint64_t offset, const MutableBufferSequence& buffers, + const MutableBufferIterator&, CompletionCondition& completion_condition, + ReadHandler& handler) + { + detail::read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence, + MutableBufferIterator, CompletionCondition, ReadHandler>( + d, offset, buffers, completion_condition, handler)( + asio::error_code(), 0, 1); + } + + template <typename AsyncRandomAccessReadDevice> + class initiate_async_read_at_buffer_sequence + { + public: + typedef typename AsyncRandomAccessReadDevice::executor_type executor_type; + + explicit initiate_async_read_at_buffer_sequence( + AsyncRandomAccessReadDevice& device) + : device_(device) + { + } + + executor_type get_executor() const ASIO_NOEXCEPT + { + return device_.get_executor(); + } + + template <typename ReadHandler, typename MutableBufferSequence, + typename CompletionCondition> + void operator()(ASIO_MOVE_ARG(ReadHandler) handler, + uint64_t offset, const MutableBufferSequence& buffers, + ASIO_MOVE_ARG(CompletionCondition) completion_cond) const + { + // If you get an error on the following line it means that your handler + // does not meet the documented type requirements for a ReadHandler. + ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; + + non_const_lvalue<ReadHandler> handler2(handler); + non_const_lvalue<CompletionCondition> completion_cond2(completion_cond); + start_read_at_buffer_sequence_op(device_, offset, buffers, + asio::buffer_sequence_begin(buffers), + completion_cond2.value, handler2.value); + } + + private: + AsyncRandomAccessReadDevice& device_; + }; +} // namespace detail + +#if !defined(GENERATING_DOCUMENTATION) + +template <template <typename, typename> class Associator, + typename AsyncRandomAccessReadDevice, typename MutableBufferSequence, + typename MutableBufferIterator, typename CompletionCondition, + typename ReadHandler, typename DefaultCandidate> +struct associator<Associator, + detail::read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence, + MutableBufferIterator, CompletionCondition, ReadHandler>, + DefaultCandidate> + : Associator<ReadHandler, DefaultCandidate> +{ + static typename Associator<ReadHandler, DefaultCandidate>::type get( + const detail::read_at_op<AsyncRandomAccessReadDevice, + MutableBufferSequence, MutableBufferIterator, + CompletionCondition, ReadHandler>& h, + const DefaultCandidate& c = DefaultCandidate()) ASIO_NOEXCEPT + { + return Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c); + } +}; + +#endif // !defined(GENERATING_DOCUMENTATION) + +template <typename AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename CompletionCondition, + ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code, + std::size_t)) ReadHandler> +inline ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler, + void (asio::error_code, std::size_t)) +async_read_at(AsyncRandomAccessReadDevice& d, + uint64_t offset, const MutableBufferSequence& buffers, + CompletionCondition completion_condition, + ASIO_MOVE_ARG(ReadHandler) handler) +{ + return async_initiate<ReadHandler, + void (asio::error_code, std::size_t)>( + detail::initiate_async_read_at_buffer_sequence< + AsyncRandomAccessReadDevice>(d), + handler, offset, buffers, + ASIO_MOVE_CAST(CompletionCondition)(completion_condition)); +} + +template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence, + ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code, + std::size_t)) ReadHandler> +inline ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler, + void (asio::error_code, std::size_t)) +async_read_at(AsyncRandomAccessReadDevice& d, + uint64_t offset, const MutableBufferSequence& buffers, + ASIO_MOVE_ARG(ReadHandler) handler) +{ + return async_initiate<ReadHandler, + void (asio::error_code, std::size_t)>( + detail::initiate_async_read_at_buffer_sequence< + AsyncRandomAccessReadDevice>(d), + handler, offset, buffers, transfer_all()); +} + +#if !defined(ASIO_NO_EXTENSIONS) +#if !defined(ASIO_NO_IOSTREAM) + +namespace detail +{ + template <typename AsyncRandomAccessReadDevice, typename Allocator, + typename CompletionCondition, typename ReadHandler> + class read_at_streambuf_op + : public base_from_cancellation_state<ReadHandler>, + base_from_completion_cond<CompletionCondition> + { + public: + read_at_streambuf_op(AsyncRandomAccessReadDevice& device, + uint64_t offset, basic_streambuf<Allocator>& streambuf, + CompletionCondition& completion_condition, ReadHandler& handler) + : base_from_cancellation_state<ReadHandler>( + handler, enable_partial_cancellation()), + base_from_completion_cond<CompletionCondition>(completion_condition), + device_(device), + offset_(offset), + streambuf_(streambuf), + start_(0), + total_transferred_(0), + handler_(ASIO_MOVE_CAST(ReadHandler)(handler)) + { + } + +#if defined(ASIO_HAS_MOVE) + read_at_streambuf_op(const read_at_streambuf_op& other) + : base_from_cancellation_state<ReadHandler>(other), + base_from_completion_cond<CompletionCondition>(other), + device_(other.device_), + offset_(other.offset_), + streambuf_(other.streambuf_), + start_(other.start_), + total_transferred_(other.total_transferred_), + handler_(other.handler_) + { + } + + read_at_streambuf_op(read_at_streambuf_op&& other) + : base_from_cancellation_state<ReadHandler>( + ASIO_MOVE_CAST(base_from_cancellation_state< + ReadHandler>)(other)), + base_from_completion_cond<CompletionCondition>( + ASIO_MOVE_CAST(base_from_completion_cond< + CompletionCondition>)(other)), + device_(other.device_), + offset_(other.offset_), + streambuf_(other.streambuf_), + start_(other.start_), + total_transferred_(other.total_transferred_), + handler_(ASIO_MOVE_CAST(ReadHandler)(other.handler_)) + { + } +#endif // defined(ASIO_HAS_MOVE) + + void operator()(asio::error_code ec, + std::size_t bytes_transferred, int start = 0) + { + std::size_t max_size, bytes_available; + switch (start_ = start) + { + case 1: + max_size = this->check_for_completion(ec, total_transferred_); + bytes_available = read_size_helper(streambuf_, max_size); + for (;;) + { + { + ASIO_HANDLER_LOCATION((__FILE__, __LINE__, "async_read_at")); + device_.async_read_some_at(offset_ + total_transferred_, + streambuf_.prepare(bytes_available), + ASIO_MOVE_CAST(read_at_streambuf_op)(*this)); + } + return; default: + total_transferred_ += bytes_transferred; + streambuf_.commit(bytes_transferred); + max_size = this->check_for_completion(ec, total_transferred_); + bytes_available = read_size_helper(streambuf_, max_size); + if ((!ec && bytes_transferred == 0) || bytes_available == 0) + break; + if (this->cancelled() != cancellation_type::none) + { + ec = asio::error::operation_aborted; + break; + } + } + + ASIO_MOVE_OR_LVALUE(ReadHandler)(handler_)( + static_cast<const asio::error_code&>(ec), + static_cast<const std::size_t&>(total_transferred_)); + } + } + + //private: + AsyncRandomAccessReadDevice& device_; + uint64_t offset_; + asio::basic_streambuf<Allocator>& streambuf_; + int start_; + std::size_t total_transferred_; + ReadHandler handler_; + }; + + template <typename AsyncRandomAccessReadDevice, typename Allocator, + typename CompletionCondition, typename ReadHandler> + inline asio_handler_allocate_is_deprecated + asio_handler_allocate(std::size_t size, + read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator, + CompletionCondition, ReadHandler>* 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 AsyncRandomAccessReadDevice, typename Allocator, + typename CompletionCondition, typename ReadHandler> + inline asio_handler_deallocate_is_deprecated + asio_handler_deallocate(void* pointer, std::size_t size, + read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator, + CompletionCondition, ReadHandler>* 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 AsyncRandomAccessReadDevice, typename Allocator, + typename CompletionCondition, typename ReadHandler> + inline bool asio_handler_is_continuation( + read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator, + CompletionCondition, ReadHandler>* this_handler) + { + return this_handler->start_ == 0 ? true + : asio_handler_cont_helpers::is_continuation( + this_handler->handler_); + } + + template <typename Function, typename AsyncRandomAccessReadDevice, + typename Allocator, typename CompletionCondition, typename ReadHandler> + inline asio_handler_invoke_is_deprecated + asio_handler_invoke(Function& function, + read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator, + CompletionCondition, ReadHandler>* 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 AsyncRandomAccessReadDevice, + typename Allocator, typename CompletionCondition, typename ReadHandler> + inline asio_handler_invoke_is_deprecated + asio_handler_invoke(const Function& function, + read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator, + CompletionCondition, ReadHandler>* 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 AsyncRandomAccessReadDevice> + class initiate_async_read_at_streambuf + { + public: + typedef typename AsyncRandomAccessReadDevice::executor_type executor_type; + + explicit initiate_async_read_at_streambuf( + AsyncRandomAccessReadDevice& device) + : device_(device) + { + } + + executor_type get_executor() const ASIO_NOEXCEPT + { + return device_.get_executor(); + } + + template <typename ReadHandler, + typename Allocator, typename CompletionCondition> + void operator()(ASIO_MOVE_ARG(ReadHandler) handler, + uint64_t offset, basic_streambuf<Allocator>* b, + ASIO_MOVE_ARG(CompletionCondition) completion_cond) const + { + // If you get an error on the following line it means that your handler + // does not meet the documented type requirements for a ReadHandler. + ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check; + + non_const_lvalue<ReadHandler> handler2(handler); + non_const_lvalue<CompletionCondition> completion_cond2(completion_cond); + read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator, + CompletionCondition, typename decay<ReadHandler>::type>( + device_, offset, *b, completion_cond2.value, handler2.value)( + asio::error_code(), 0, 1); + } + + private: + AsyncRandomAccessReadDevice& device_; + }; +} // namespace detail + +#if !defined(GENERATING_DOCUMENTATION) + +template <template <typename, typename> class Associator, + typename AsyncRandomAccessReadDevice, typename Executor, + typename CompletionCondition, typename ReadHandler, + typename DefaultCandidate> +struct associator<Associator, + detail::read_at_streambuf_op<AsyncRandomAccessReadDevice, + Executor, CompletionCondition, ReadHandler>, + DefaultCandidate> + : Associator<ReadHandler, DefaultCandidate> +{ + static typename Associator<ReadHandler, DefaultCandidate>::type get( + const detail::read_at_streambuf_op<AsyncRandomAccessReadDevice, + Executor, CompletionCondition, ReadHandler>& h, + const DefaultCandidate& c = DefaultCandidate()) ASIO_NOEXCEPT + { + return Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c); + } +}; + +#endif // !defined(GENERATING_DOCUMENTATION) + +template <typename AsyncRandomAccessReadDevice, + typename Allocator, typename CompletionCondition, + ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code, + std::size_t)) ReadHandler> +inline ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler, + void (asio::error_code, std::size_t)) +async_read_at(AsyncRandomAccessReadDevice& d, + uint64_t offset, asio::basic_streambuf<Allocator>& b, + CompletionCondition completion_condition, + ASIO_MOVE_ARG(ReadHandler) handler) +{ + return async_initiate<ReadHandler, + void (asio::error_code, std::size_t)>( + detail::initiate_async_read_at_streambuf<AsyncRandomAccessReadDevice>(d), + handler, offset, &b, + ASIO_MOVE_CAST(CompletionCondition)(completion_condition)); +} + +template <typename AsyncRandomAccessReadDevice, typename Allocator, + ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code, + std::size_t)) ReadHandler> +inline ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler, + void (asio::error_code, std::size_t)) +async_read_at(AsyncRandomAccessReadDevice& d, + uint64_t offset, asio::basic_streambuf<Allocator>& b, + ASIO_MOVE_ARG(ReadHandler) handler) +{ + return async_initiate<ReadHandler, + void (asio::error_code, std::size_t)>( + detail::initiate_async_read_at_streambuf<AsyncRandomAccessReadDevice>(d), + handler, offset, &b, transfer_all()); +} + +#endif // !defined(ASIO_NO_IOSTREAM) +#endif // !defined(ASIO_NO_EXTENSIONS) + +} // namespace asio + +#include "asio/detail/pop_options.hpp" + +#endif // ASIO_IMPL_READ_AT_HPP |