1481 lines
58 KiB
C++
1481 lines
58 KiB
C++
|
//
|
||
|
|
// read.hpp
|
||
|
|
// ~~~~~~~~
|
||
|
|
//
|
||
|
|
// Copyright (c) 2003-2023 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_READ_HPP
|
||
|
|
#define ASIO_READ_HPP
|
||
|
|
|
||
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
|
||
|
|
# pragma once
|
||
|
|
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
|
||
|
|
|
||
|
|
#include "asio/detail/config.hpp"
|
||
|
|
#include <cstddef>
|
||
|
|
#include "asio/async_result.hpp"
|
||
|
|
#include "asio/buffer.hpp"
|
||
|
|
#include "asio/completion_condition.hpp"
|
||
|
|
#include "asio/error.hpp"
|
||
|
|
|
||
|
|
#if !defined(ASIO_NO_EXTENSIONS)
|
||
|
|
# include "asio/basic_streambuf_fwd.hpp"
|
||
|
|
#endif // !defined(ASIO_NO_EXTENSIONS)
|
||
|
|
|
||
|
|
#include "asio/detail/push_options.hpp"
|
||
|
|
|
||
|
|
namespace asio {
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
template <typename> class initiate_async_read;
|
||
|
|
#if !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
|
||
|
|
template <typename> class initiate_async_read_dynbuf_v1;
|
||
|
|
#endif // !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
|
||
|
|
template <typename> class initiate_async_read_dynbuf_v2;
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @defgroup read asio::read
|
||
|
|
*
|
||
|
|
* @brief The @c read function is a composed operation that reads a certain
|
||
|
|
* amount of data from a stream before returning.
|
||
|
|
*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffers are full. That is, the bytes transferred is equal to
|
||
|
|
* the sum of the buffer sizes.
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers One or more buffers into which the data will be read. The sum
|
||
|
|
* of the buffer sizes indicates the maximum number of bytes to read from the
|
||
|
|
* stream.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @throws asio::system_error Thrown on failure.
|
||
|
|
*
|
||
|
|
* @par Example
|
||
|
|
* To read into a single data buffer use the @ref buffer function as follows:
|
||
|
|
* @code asio::read(s, asio::buffer(data, size)); @endcode
|
||
|
|
* See the @ref buffer documentation for information on reading into multiple
|
||
|
|
* buffers in one go, and how to use it with arrays, boost::array or
|
||
|
|
* std::vector.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all()); @endcode
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename MutableBufferSequence>
|
||
|
|
std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
|
||
|
|
typename constraint<
|
||
|
|
is_mutable_buffer_sequence<MutableBufferSequence>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffers are full. That is, the bytes transferred is equal to
|
||
|
|
* the sum of the buffer sizes.
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers One or more buffers into which the data will be read. The sum
|
||
|
|
* of the buffer sizes indicates the maximum number of bytes to read from the
|
||
|
|
* stream.
|
||
|
|
*
|
||
|
|
* @param ec Set to indicate what error occurred, if any.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @par Example
|
||
|
|
* To read into a single data buffer use the @ref buffer function as follows:
|
||
|
|
* @code asio::read(s, asio::buffer(data, size), ec); @endcode
|
||
|
|
* See the @ref buffer documentation for information on reading into multiple
|
||
|
|
* buffers in one go, and how to use it with arrays, boost::array or
|
||
|
|
* std::vector.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all(), ec); @endcode
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename MutableBufferSequence>
|
||
|
|
std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
|
||
|
|
asio::error_code& ec,
|
||
|
|
typename constraint<
|
||
|
|
is_mutable_buffer_sequence<MutableBufferSequence>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffers are full. That is, the bytes transferred is equal to
|
||
|
|
* the sum of the buffer sizes.
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers One or more buffers into which the data will be read. The sum
|
||
|
|
* of the buffer sizes indicates the maximum number of bytes to read from the
|
||
|
|
* stream.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's read_some function.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @throws asio::system_error Thrown on failure.
|
||
|
|
*
|
||
|
|
* @par Example
|
||
|
|
* To read into a single data buffer use the @ref buffer function as follows:
|
||
|
|
* @code asio::read(s, asio::buffer(data, size),
|
||
|
|
* asio::transfer_at_least(32)); @endcode
|
||
|
|
* See the @ref buffer documentation for information on reading into multiple
|
||
|
|
* buffers in one go, and how to use it with arrays, boost::array or
|
||
|
|
* std::vector.
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename MutableBufferSequence,
|
||
|
|
typename CompletionCondition>
|
||
|
|
std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
|
||
|
|
CompletionCondition completion_condition,
|
||
|
|
typename constraint<
|
||
|
|
is_mutable_buffer_sequence<MutableBufferSequence>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffers are full. That is, the bytes transferred is equal to
|
||
|
|
* the sum of the buffer sizes.
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers One or more buffers into which the data will be read. The sum
|
||
|
|
* of the buffer sizes indicates the maximum number of bytes to read from the
|
||
|
|
* stream.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's read_some function.
|
||
|
|
*
|
||
|
|
* @param ec Set to indicate what error occurred, if any.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes read. If an error occurs, returns the total
|
||
|
|
* number of bytes successfully transferred prior to the error.
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename MutableBufferSequence,
|
||
|
|
typename CompletionCondition>
|
||
|
|
std::size_t read(SyncReadStream& s, const MutableBufferSequence& buffers,
|
||
|
|
CompletionCondition completion_condition, asio::error_code& ec,
|
||
|
|
typename constraint<
|
||
|
|
is_mutable_buffer_sequence<MutableBufferSequence>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
#if !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @throws asio::system_error Thrown on failure.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all()); @endcode
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename DynamicBuffer_v1>
|
||
|
|
std::size_t read(SyncReadStream& s,
|
||
|
|
ASIO_MOVE_ARG(DynamicBuffer_v1) buffers,
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v1<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0,
|
||
|
|
typename constraint<
|
||
|
|
!is_dynamic_buffer_v2<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffer is full (that is, it has reached maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param ec Set to indicate what error occurred, if any.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all(), ec); @endcode
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename DynamicBuffer_v1>
|
||
|
|
std::size_t read(SyncReadStream& s,
|
||
|
|
ASIO_MOVE_ARG(DynamicBuffer_v1) buffers,
|
||
|
|
asio::error_code& ec,
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v1<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0,
|
||
|
|
typename constraint<
|
||
|
|
!is_dynamic_buffer_v2<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's read_some function.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @throws asio::system_error Thrown on failure.
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename DynamicBuffer_v1,
|
||
|
|
typename CompletionCondition>
|
||
|
|
std::size_t read(SyncReadStream& s,
|
||
|
|
ASIO_MOVE_ARG(DynamicBuffer_v1) buffers,
|
||
|
|
CompletionCondition completion_condition,
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v1<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0,
|
||
|
|
typename constraint<
|
||
|
|
!is_dynamic_buffer_v2<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's read_some function.
|
||
|
|
*
|
||
|
|
* @param ec Set to indicate what error occurred, if any.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes read. If an error occurs, returns the total
|
||
|
|
* number of bytes successfully transferred prior to the error.
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename DynamicBuffer_v1,
|
||
|
|
typename CompletionCondition>
|
||
|
|
std::size_t read(SyncReadStream& s,
|
||
|
|
ASIO_MOVE_ARG(DynamicBuffer_v1) buffers,
|
||
|
|
CompletionCondition completion_condition, asio::error_code& ec,
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v1<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0,
|
||
|
|
typename constraint<
|
||
|
|
!is_dynamic_buffer_v2<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
#if !defined(ASIO_NO_EXTENSIONS)
|
||
|
|
#if !defined(ASIO_NO_IOSTREAM)
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffer is full (that is, it has reached maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param b The basic_streambuf object into which the data will be read.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @throws asio::system_error Thrown on failure.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::read(
|
||
|
|
* s, b,
|
||
|
|
* asio::transfer_all()); @endcode
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename Allocator>
|
||
|
|
std::size_t read(SyncReadStream& s, basic_streambuf<Allocator>& b);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffer is full (that is, it has reached maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param b The basic_streambuf object into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param ec Set to indicate what error occurred, if any.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::read(
|
||
|
|
* s, b,
|
||
|
|
* asio::transfer_all(), ec); @endcode
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename Allocator>
|
||
|
|
std::size_t read(SyncReadStream& s, basic_streambuf<Allocator>& b,
|
||
|
|
asio::error_code& ec);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffer is full (that is, it has reached maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param b The basic_streambuf object into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's read_some function.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @throws asio::system_error Thrown on failure.
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename Allocator,
|
||
|
|
typename CompletionCondition>
|
||
|
|
std::size_t read(SyncReadStream& s, basic_streambuf<Allocator>& b,
|
||
|
|
CompletionCondition completion_condition);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffer is full (that is, it has reached maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param b The basic_streambuf object into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's read_some function.
|
||
|
|
*
|
||
|
|
* @param ec Set to indicate what error occurred, if any.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes read. If an error occurs, returns the total
|
||
|
|
* number of bytes successfully transferred prior to the error.
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename Allocator,
|
||
|
|
typename CompletionCondition>
|
||
|
|
std::size_t read(SyncReadStream& s, basic_streambuf<Allocator>& b,
|
||
|
|
CompletionCondition completion_condition, asio::error_code& ec);
|
||
|
|
|
||
|
|
#endif // !defined(ASIO_NO_IOSTREAM)
|
||
|
|
#endif // !defined(ASIO_NO_EXTENSIONS)
|
||
|
|
#endif // !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @throws asio::system_error Thrown on failure.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all()); @endcode
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename DynamicBuffer_v2>
|
||
|
|
std::size_t read(SyncReadStream& s, DynamicBuffer_v2 buffers,
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v2<DynamicBuffer_v2>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffer is full (that is, it has reached maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param ec Set to indicate what error occurred, if any.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all(), ec); @endcode
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename DynamicBuffer_v2>
|
||
|
|
std::size_t read(SyncReadStream& s, DynamicBuffer_v2 buffers,
|
||
|
|
asio::error_code& ec,
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v2<DynamicBuffer_v2>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's read_some function.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes transferred.
|
||
|
|
*
|
||
|
|
* @throws asio::system_error Thrown on failure.
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename DynamicBuffer_v2,
|
||
|
|
typename CompletionCondition>
|
||
|
|
std::size_t read(SyncReadStream& s, DynamicBuffer_v2 buffers,
|
||
|
|
CompletionCondition completion_condition,
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v2<DynamicBuffer_v2>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/// Attempt to read a certain amount of data from a stream before returning.
|
||
|
|
/**
|
||
|
|
* This function is used to read a certain number of bytes of data from a
|
||
|
|
* stream. The call will block until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* read_some function.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the SyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's read_some function.
|
||
|
|
*
|
||
|
|
* @param ec Set to indicate what error occurred, if any.
|
||
|
|
*
|
||
|
|
* @returns The number of bytes read. If an error occurs, returns the total
|
||
|
|
* number of bytes successfully transferred prior to the error.
|
||
|
|
*/
|
||
|
|
template <typename SyncReadStream, typename DynamicBuffer_v2,
|
||
|
|
typename CompletionCondition>
|
||
|
|
std::size_t read(SyncReadStream& s, DynamicBuffer_v2 buffers,
|
||
|
|
CompletionCondition completion_condition, asio::error_code& ec,
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v2<DynamicBuffer_v2>::value
|
||
|
|
>::type = 0);
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
/**
|
||
|
|
* @defgroup async_read asio::async_read
|
||
|
|
*
|
||
|
|
* @brief The @c async_read function is a composed asynchronous operation that
|
||
|
|
* reads a certain amount of data from a stream before completion.
|
||
|
|
*/
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/// Start an asynchronous operation to read a certain amount of data from a
|
||
|
|
/// stream.
|
||
|
|
/**
|
||
|
|
* This function is used to asynchronously read a certain number of bytes of
|
||
|
|
* data from a stream. It is an initiating function for an @ref
|
||
|
|
* asynchronous_operation, and always returns immediately. The asynchronous
|
||
|
|
* operation will continue until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffers are full. That is, the bytes transferred is equal to
|
||
|
|
* the sum of the buffer sizes.
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* async_read_some function, and is known as a <em>composed operation</em>. The
|
||
|
|
* program must ensure that the stream performs no other read operations (such
|
||
|
|
* as async_read, the stream's async_read_some function, or any other composed
|
||
|
|
* operations that perform reads) until this operation completes.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the AsyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers One or more buffers into which the data will be read. The sum
|
||
|
|
* of the buffer sizes indicates the maximum number of bytes to read from the
|
||
|
|
* stream. Although the buffers object may be copied as necessary, ownership of
|
||
|
|
* the underlying memory blocks is retained by the caller, which must guarantee
|
||
|
|
* that they remain valid until the completion handler is called.
|
||
|
|
*
|
||
|
|
* @param token The @ref completion_token that will be used to produce a
|
||
|
|
* completion handler, which will be called when the read completes.
|
||
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
||
|
|
* @ref yield_context, or a function object with the correct completion
|
||
|
|
* signature. The function signature of the completion handler must be:
|
||
|
|
* @code void handler(
|
||
|
|
* // Result of operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes copied into the buffers. If an error
|
||
|
|
* // occurred, this will be the number of bytes successfully
|
||
|
|
* // transferred prior to the error.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
||
|
|
* not, the completion handler will not be invoked from within this function.
|
||
|
|
* On immediate completion, invocation of the handler will be performed in a
|
||
|
|
* manner equivalent to using asio::post().
|
||
|
|
*
|
||
|
|
* @par Completion Signature
|
||
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
||
|
|
*
|
||
|
|
* @par Example
|
||
|
|
* To read into a single data buffer use the @ref buffer function as follows:
|
||
|
|
* @code
|
||
|
|
* asio::async_read(s, asio::buffer(data, size), handler);
|
||
|
|
* @endcode
|
||
|
|
* See the @ref buffer documentation for information on reading into multiple
|
||
|
|
* buffers in one go, and how to use it with arrays, boost::array or
|
||
|
|
* std::vector.
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::async_read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all(),
|
||
|
|
* handler); @endcode
|
||
|
|
*
|
||
|
|
* @par Per-Operation Cancellation
|
||
|
|
* This asynchronous operation supports cancellation for the following
|
||
|
|
* asio::cancellation_type values:
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::terminal
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::partial
|
||
|
|
*
|
||
|
|
* if they are also supported by the @c AsyncReadStream type's
|
||
|
|
* @c async_read_some operation.
|
||
|
|
*/
|
||
|
|
template <typename AsyncReadStream, typename MutableBufferSequence,
|
||
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
||
|
|
std::size_t)) ReadToken
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
|
||
|
|
typename AsyncReadStream::executor_type)>
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
||
|
|
void (asio::error_code, std::size_t))
|
||
|
|
async_read(AsyncReadStream& s, const MutableBufferSequence& buffers,
|
||
|
|
ASIO_MOVE_ARG(ReadToken) token
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(
|
||
|
|
typename AsyncReadStream::executor_type),
|
||
|
|
typename constraint<
|
||
|
|
is_mutable_buffer_sequence<MutableBufferSequence>::value
|
||
|
|
>::type = 0)
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
||
|
|
async_initiate<ReadToken,
|
||
|
|
void (asio::error_code, std::size_t)>(
|
||
|
|
declval<detail::initiate_async_read<AsyncReadStream> >(),
|
||
|
|
token, buffers, transfer_all())));
|
||
|
|
|
||
|
|
/// Start an asynchronous operation to read a certain amount of data from a
|
||
|
|
/// stream.
|
||
|
|
/**
|
||
|
|
* This function is used to asynchronously read a certain number of bytes of
|
||
|
|
* data from a stream. It is an initiating function for an @ref
|
||
|
|
* asynchronous_operation, and always returns immediately. The asynchronous
|
||
|
|
* operation will continue until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffers are full. That is, the bytes transferred is equal to
|
||
|
|
* the sum of the buffer sizes.
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the AsyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers One or more buffers into which the data will be read. The sum
|
||
|
|
* of the buffer sizes indicates the maximum number of bytes to read from the
|
||
|
|
* stream. Although the buffers object may be copied as necessary, ownership of
|
||
|
|
* the underlying memory blocks is retained by the caller, which must guarantee
|
||
|
|
* that they remain valid until the completion handler is called.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest async_read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's async_read_some function.
|
||
|
|
*
|
||
|
|
* @param token The @ref completion_token that will be used to produce a
|
||
|
|
* completion handler, which will be called when the read completes.
|
||
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
||
|
|
* @ref yield_context, or a function object with the correct completion
|
||
|
|
* signature. The function signature of the completion handler must be:
|
||
|
|
* @code void handler(
|
||
|
|
* // Result of operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes copied into the buffers. If an error
|
||
|
|
* // occurred, this will be the number of bytes successfully
|
||
|
|
* // transferred prior to the error.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
||
|
|
* not, the completion handler will not be invoked from within this function.
|
||
|
|
* On immediate completion, invocation of the handler will be performed in a
|
||
|
|
* manner equivalent to using asio::post().
|
||
|
|
*
|
||
|
|
* @par Completion Signature
|
||
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
||
|
|
*
|
||
|
|
* @par Example
|
||
|
|
* To read into a single data buffer use the @ref buffer function as follows:
|
||
|
|
* @code asio::async_read(s,
|
||
|
|
* asio::buffer(data, size),
|
||
|
|
* asio::transfer_at_least(32),
|
||
|
|
* handler); @endcode
|
||
|
|
* See the @ref buffer documentation for information on reading into multiple
|
||
|
|
* buffers in one go, and how to use it with arrays, boost::array or
|
||
|
|
* std::vector.
|
||
|
|
*
|
||
|
|
* @par Per-Operation Cancellation
|
||
|
|
* This asynchronous operation supports cancellation for the following
|
||
|
|
* asio::cancellation_type values:
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::terminal
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::partial
|
||
|
|
*
|
||
|
|
* if they are also supported by the @c AsyncReadStream type's
|
||
|
|
* @c async_read_some operation.
|
||
|
|
*/
|
||
|
|
template <typename AsyncReadStream,
|
||
|
|
typename MutableBufferSequence, typename CompletionCondition,
|
||
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
||
|
|
std::size_t)) ReadToken
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
|
||
|
|
typename AsyncReadStream::executor_type)>
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
||
|
|
void (asio::error_code, std::size_t))
|
||
|
|
async_read(AsyncReadStream& s, const MutableBufferSequence& buffers,
|
||
|
|
CompletionCondition completion_condition,
|
||
|
|
ASIO_MOVE_ARG(ReadToken) token
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(
|
||
|
|
typename AsyncReadStream::executor_type),
|
||
|
|
typename constraint<
|
||
|
|
is_mutable_buffer_sequence<MutableBufferSequence>::value
|
||
|
|
>::type = 0)
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
||
|
|
async_initiate<ReadToken,
|
||
|
|
void (asio::error_code, std::size_t)>(
|
||
|
|
declval<detail::initiate_async_read<AsyncReadStream> >(),
|
||
|
|
token, buffers,
|
||
|
|
ASIO_MOVE_CAST(CompletionCondition)(completion_condition))));
|
||
|
|
|
||
|
|
#if !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
|
||
|
|
|
||
|
|
/// Start an asynchronous operation to read a certain amount of data from a
|
||
|
|
/// stream.
|
||
|
|
/**
|
||
|
|
* This function is used to asynchronously read a certain number of bytes of
|
||
|
|
* data from a stream. It is an initiating function for an @ref
|
||
|
|
* asynchronous_operation, and always returns immediately. The asynchronous
|
||
|
|
* operation will continue until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* async_read_some function, and is known as a <em>composed operation</em>. The
|
||
|
|
* program must ensure that the stream performs no other read operations (such
|
||
|
|
* as async_read, the stream's async_read_some function, or any other composed
|
||
|
|
* operations that perform reads) until this operation completes.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the AsyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
* Although the buffers object may be copied as necessary, ownership of the
|
||
|
|
* underlying memory blocks is retained by the caller, which must guarantee
|
||
|
|
* that they remain valid until the completion handler is called.
|
||
|
|
*
|
||
|
|
* @param token The @ref completion_token that will be used to produce a
|
||
|
|
* completion handler, which will be called when the read completes.
|
||
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
||
|
|
* @ref yield_context, or a function object with the correct completion
|
||
|
|
* signature. The function signature of the completion handler must be:
|
||
|
|
* @code void handler(
|
||
|
|
* // Result of operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes copied into the buffers. If an error
|
||
|
|
* // occurred, this will be the number of bytes successfully
|
||
|
|
* // transferred prior to the error.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
||
|
|
* not, the completion handler will not be invoked from within this function.
|
||
|
|
* On immediate completion, invocation of the handler will be performed in a
|
||
|
|
* manner equivalent to using asio::post().
|
||
|
|
*
|
||
|
|
* @par Completion Signature
|
||
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::async_read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all(),
|
||
|
|
* handler); @endcode
|
||
|
|
*
|
||
|
|
* @par Per-Operation Cancellation
|
||
|
|
* This asynchronous operation supports cancellation for the following
|
||
|
|
* asio::cancellation_type values:
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::terminal
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::partial
|
||
|
|
*
|
||
|
|
* if they are also supported by the @c AsyncReadStream type's
|
||
|
|
* @c async_read_some operation.
|
||
|
|
*/
|
||
|
|
template <typename AsyncReadStream, typename DynamicBuffer_v1,
|
||
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
||
|
|
std::size_t)) ReadToken
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
|
||
|
|
typename AsyncReadStream::executor_type)>
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
||
|
|
void (asio::error_code, std::size_t))
|
||
|
|
async_read(AsyncReadStream& s,
|
||
|
|
ASIO_MOVE_ARG(DynamicBuffer_v1) buffers,
|
||
|
|
ASIO_MOVE_ARG(ReadToken) token
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(
|
||
|
|
typename AsyncReadStream::executor_type),
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v1<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0,
|
||
|
|
typename constraint<
|
||
|
|
!is_dynamic_buffer_v2<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0)
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
||
|
|
async_initiate<ReadToken,
|
||
|
|
void (asio::error_code, std::size_t)>(
|
||
|
|
declval<detail::initiate_async_read_dynbuf_v1<AsyncReadStream> >(),
|
||
|
|
token, ASIO_MOVE_CAST(DynamicBuffer_v1)(buffers),
|
||
|
|
transfer_all())));
|
||
|
|
|
||
|
|
/// Start an asynchronous operation to read a certain amount of data from a
|
||
|
|
/// stream.
|
||
|
|
/**
|
||
|
|
* This function is used to asynchronously read a certain number of bytes of
|
||
|
|
* data from a stream. It is an initiating function for an @ref
|
||
|
|
* asynchronous_operation, and always returns immediately. The asynchronous
|
||
|
|
* operation will continue until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* async_read_some function, and is known as a <em>composed operation</em>. The
|
||
|
|
* program must ensure that the stream performs no other read operations (such
|
||
|
|
* as async_read, the stream's async_read_some function, or any other composed
|
||
|
|
* operations that perform reads) until this operation completes.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the AsyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
* Although the buffers object may be copied as necessary, ownership of the
|
||
|
|
* underlying memory blocks is retained by the caller, which must guarantee
|
||
|
|
* that they remain valid until the completion handler is called.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest async_read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's async_read_some function.
|
||
|
|
*
|
||
|
|
* @param token The @ref completion_token that will be used to produce a
|
||
|
|
* completion handler, which will be called when the read completes.
|
||
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
||
|
|
* @ref yield_context, or a function object with the correct completion
|
||
|
|
* signature. The function signature of the completion handler must be:
|
||
|
|
* @code void handler(
|
||
|
|
* // Result of operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes copied into the buffers. If an error
|
||
|
|
* // occurred, this will be the number of bytes successfully
|
||
|
|
* // transferred prior to the error.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
||
|
|
* not, the completion handler will not be invoked from within this function.
|
||
|
|
* On immediate completion, invocation of the handler will be performed in a
|
||
|
|
* manner equivalent to using asio::post().
|
||
|
|
*
|
||
|
|
* @par Completion Signature
|
||
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
||
|
|
*
|
||
|
|
* @par Per-Operation Cancellation
|
||
|
|
* This asynchronous operation supports cancellation for the following
|
||
|
|
* asio::cancellation_type values:
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::terminal
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::partial
|
||
|
|
*
|
||
|
|
* if they are also supported by the @c AsyncReadStream type's
|
||
|
|
* @c async_read_some operation.
|
||
|
|
*/
|
||
|
|
template <typename AsyncReadStream,
|
||
|
|
typename DynamicBuffer_v1, typename CompletionCondition,
|
||
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
||
|
|
std::size_t)) ReadToken
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
|
||
|
|
typename AsyncReadStream::executor_type)>
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
||
|
|
void (asio::error_code, std::size_t))
|
||
|
|
async_read(AsyncReadStream& s,
|
||
|
|
ASIO_MOVE_ARG(DynamicBuffer_v1) buffers,
|
||
|
|
CompletionCondition completion_condition,
|
||
|
|
ASIO_MOVE_ARG(ReadToken) token
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(
|
||
|
|
typename AsyncReadStream::executor_type),
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v1<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0,
|
||
|
|
typename constraint<
|
||
|
|
!is_dynamic_buffer_v2<typename decay<DynamicBuffer_v1>::type>::value
|
||
|
|
>::type = 0)
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
||
|
|
async_initiate<ReadToken,
|
||
|
|
void (asio::error_code, std::size_t)>(
|
||
|
|
declval<detail::initiate_async_read_dynbuf_v1<AsyncReadStream> >(),
|
||
|
|
token, ASIO_MOVE_CAST(DynamicBuffer_v1)(buffers),
|
||
|
|
ASIO_MOVE_CAST(CompletionCondition)(completion_condition))));
|
||
|
|
|
||
|
|
#if !defined(ASIO_NO_EXTENSIONS)
|
||
|
|
#if !defined(ASIO_NO_IOSTREAM)
|
||
|
|
|
||
|
|
/// Start an asynchronous operation to read a certain amount of data from a
|
||
|
|
/// stream.
|
||
|
|
/**
|
||
|
|
* This function is used to asynchronously read a certain number of bytes of
|
||
|
|
* data from a stream. It is an initiating function for an @ref
|
||
|
|
* asynchronous_operation, and always returns immediately. The asynchronous
|
||
|
|
* operation will continue until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffer is full (that is, it has reached maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* async_read_some function, and is known as a <em>composed operation</em>. The
|
||
|
|
* program must ensure that the stream performs no other read operations (such
|
||
|
|
* as async_read, the stream's async_read_some function, or any other composed
|
||
|
|
* operations that perform reads) until this operation completes.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the AsyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param b A basic_streambuf object into which the data will be read. Ownership
|
||
|
|
* of the streambuf is retained by the caller, which must guarantee that it
|
||
|
|
* remains valid until the completion handler is called.
|
||
|
|
*
|
||
|
|
* @param token The @ref completion_token that will be used to produce a
|
||
|
|
* completion handler, which will be called when the read completes.
|
||
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
||
|
|
* @ref yield_context, or a function object with the correct completion
|
||
|
|
* signature. The function signature of the completion handler must be:
|
||
|
|
* @code void handler(
|
||
|
|
* // Result of operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes copied into the buffers. If an error
|
||
|
|
* // occurred, this will be the number of bytes successfully
|
||
|
|
* // transferred prior to the error.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
||
|
|
* not, the completion handler will not be invoked from within this function.
|
||
|
|
* On immediate completion, invocation of the handler will be performed in a
|
||
|
|
* manner equivalent to using asio::post().
|
||
|
|
*
|
||
|
|
* @par Completion Signature
|
||
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::async_read(
|
||
|
|
* s, b,
|
||
|
|
* asio::transfer_all(),
|
||
|
|
* handler); @endcode
|
||
|
|
*
|
||
|
|
* @par Per-Operation Cancellation
|
||
|
|
* This asynchronous operation supports cancellation for the following
|
||
|
|
* asio::cancellation_type values:
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::terminal
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::partial
|
||
|
|
*
|
||
|
|
* if they are also supported by the @c AsyncReadStream type's
|
||
|
|
* @c async_read_some operation.
|
||
|
|
*/
|
||
|
|
template <typename AsyncReadStream, typename Allocator,
|
||
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
||
|
|
std::size_t)) ReadToken
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
|
||
|
|
typename AsyncReadStream::executor_type)>
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
||
|
|
void (asio::error_code, std::size_t))
|
||
|
|
async_read(AsyncReadStream& s, basic_streambuf<Allocator>& b,
|
||
|
|
ASIO_MOVE_ARG(ReadToken) token
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(
|
||
|
|
typename AsyncReadStream::executor_type))
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
||
|
|
async_read(s, basic_streambuf_ref<Allocator>(b),
|
||
|
|
ASIO_MOVE_CAST(ReadToken)(token))));
|
||
|
|
|
||
|
|
/// Start an asynchronous operation to read a certain amount of data from a
|
||
|
|
/// stream.
|
||
|
|
/**
|
||
|
|
* This function is used to asynchronously read a certain number of bytes of
|
||
|
|
* data from a stream. It is an initiating function for an @ref
|
||
|
|
* asynchronous_operation, and always returns immediately. The asynchronous
|
||
|
|
* operation will continue until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The supplied buffer is full (that is, it has reached maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* async_read_some function, and is known as a <em>composed operation</em>. The
|
||
|
|
* program must ensure that the stream performs no other read operations (such
|
||
|
|
* as async_read, the stream's async_read_some function, or any other composed
|
||
|
|
* operations that perform reads) until this operation completes.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the AsyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param b A basic_streambuf object into which the data will be read. Ownership
|
||
|
|
* of the streambuf is retained by the caller, which must guarantee that it
|
||
|
|
* remains valid until the completion handler is called.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest async_read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's async_read_some function.
|
||
|
|
*
|
||
|
|
* @param token The @ref completion_token that will be used to produce a
|
||
|
|
* completion handler, which will be called when the read completes.
|
||
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
||
|
|
* @ref yield_context, or a function object with the correct completion
|
||
|
|
* signature. The function signature of the completion handler must be:
|
||
|
|
* @code void handler(
|
||
|
|
* // Result of operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes copied into the buffers. If an error
|
||
|
|
* // occurred, this will be the number of bytes successfully
|
||
|
|
* // transferred prior to the error.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
||
|
|
* not, the completion handler will not be invoked from within this function.
|
||
|
|
* On immediate completion, invocation of the handler will be performed in a
|
||
|
|
* manner equivalent to using asio::post().
|
||
|
|
*
|
||
|
|
* @par Completion Signature
|
||
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
||
|
|
*
|
||
|
|
* @par Per-Operation Cancellation
|
||
|
|
* This asynchronous operation supports cancellation for the following
|
||
|
|
* asio::cancellation_type values:
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::terminal
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::partial
|
||
|
|
*
|
||
|
|
* if they are also supported by the @c AsyncReadStream type's
|
||
|
|
* @c async_read_some operation.
|
||
|
|
*/
|
||
|
|
template <typename AsyncReadStream,
|
||
|
|
typename Allocator, typename CompletionCondition,
|
||
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
||
|
|
std::size_t)) ReadToken
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
|
||
|
|
typename AsyncReadStream::executor_type)>
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
||
|
|
void (asio::error_code, std::size_t))
|
||
|
|
async_read(AsyncReadStream& s, basic_streambuf<Allocator>& b,
|
||
|
|
CompletionCondition completion_condition,
|
||
|
|
ASIO_MOVE_ARG(ReadToken) token
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(
|
||
|
|
typename AsyncReadStream::executor_type))
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
||
|
|
async_read(s, basic_streambuf_ref<Allocator>(b),
|
||
|
|
ASIO_MOVE_CAST(CompletionCondition)(completion_condition),
|
||
|
|
ASIO_MOVE_CAST(ReadToken)(token))));
|
||
|
|
|
||
|
|
#endif // !defined(ASIO_NO_IOSTREAM)
|
||
|
|
#endif // !defined(ASIO_NO_EXTENSIONS)
|
||
|
|
#endif // !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
|
||
|
|
|
||
|
|
/// Start an asynchronous operation to read a certain amount of data from a
|
||
|
|
/// stream.
|
||
|
|
/**
|
||
|
|
* This function is used to asynchronously read a certain number of bytes of
|
||
|
|
* data from a stream. It is an initiating function for an @ref
|
||
|
|
* asynchronous_operation, and always returns immediately. The asynchronous
|
||
|
|
* operation will continue until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li An error occurred.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* async_read_some function, and is known as a <em>composed operation</em>. The
|
||
|
|
* program must ensure that the stream performs no other read operations (such
|
||
|
|
* as async_read, the stream's async_read_some function, or any other composed
|
||
|
|
* operations that perform reads) until this operation completes.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the AsyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
* Although the buffers object may be copied as necessary, ownership of the
|
||
|
|
* underlying memory blocks is retained by the caller, which must guarantee
|
||
|
|
* that they remain valid until the completion handler is called.
|
||
|
|
*
|
||
|
|
* @param token The @ref completion_token that will be used to produce a
|
||
|
|
* completion handler, which will be called when the read completes.
|
||
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
||
|
|
* @ref yield_context, or a function object with the correct completion
|
||
|
|
* signature. The function signature of the completion handler must be:
|
||
|
|
* @code void handler(
|
||
|
|
* // Result of operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes copied into the buffers. If an error
|
||
|
|
* // occurred, this will be the number of bytes successfully
|
||
|
|
* // transferred prior to the error.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
||
|
|
* not, the completion handler will not be invoked from within this function.
|
||
|
|
* On immediate completion, invocation of the handler will be performed in a
|
||
|
|
* manner equivalent to using asio::post().
|
||
|
|
*
|
||
|
|
* @par Completion Signature
|
||
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
||
|
|
*
|
||
|
|
* @note This overload is equivalent to calling:
|
||
|
|
* @code asio::async_read(
|
||
|
|
* s, buffers,
|
||
|
|
* asio::transfer_all(),
|
||
|
|
* handler); @endcode
|
||
|
|
*
|
||
|
|
* @par Per-Operation Cancellation
|
||
|
|
* This asynchronous operation supports cancellation for the following
|
||
|
|
* asio::cancellation_type values:
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::terminal
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::partial
|
||
|
|
*
|
||
|
|
* if they are also supported by the @c AsyncReadStream type's
|
||
|
|
* @c async_read_some operation.
|
||
|
|
*/
|
||
|
|
template <typename AsyncReadStream, typename DynamicBuffer_v2,
|
||
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
||
|
|
std::size_t)) ReadToken
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
|
||
|
|
typename AsyncReadStream::executor_type)>
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
||
|
|
void (asio::error_code, std::size_t))
|
||
|
|
async_read(AsyncReadStream& s, DynamicBuffer_v2 buffers,
|
||
|
|
ASIO_MOVE_ARG(ReadToken) token
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(
|
||
|
|
typename AsyncReadStream::executor_type),
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v2<DynamicBuffer_v2>::value
|
||
|
|
>::type = 0)
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
||
|
|
async_initiate<ReadToken,
|
||
|
|
void (asio::error_code, std::size_t)>(
|
||
|
|
declval<detail::initiate_async_read_dynbuf_v2<AsyncReadStream> >(),
|
||
|
|
token, ASIO_MOVE_CAST(DynamicBuffer_v2)(buffers),
|
||
|
|
transfer_all())));
|
||
|
|
|
||
|
|
/// Start an asynchronous operation to read a certain amount of data from a
|
||
|
|
/// stream.
|
||
|
|
/**
|
||
|
|
* This function is used to asynchronously read a certain number of bytes of
|
||
|
|
* data from a stream. It is an initiating function for an @ref
|
||
|
|
* asynchronous_operation, and always returns immediately. The asynchronous
|
||
|
|
* operation will continue until one of the following conditions is true:
|
||
|
|
*
|
||
|
|
* @li The specified dynamic buffer sequence is full (that is, it has reached
|
||
|
|
* maximum size).
|
||
|
|
*
|
||
|
|
* @li The completion_condition function object returns 0.
|
||
|
|
*
|
||
|
|
* This operation is implemented in terms of zero or more calls to the stream's
|
||
|
|
* async_read_some function, and is known as a <em>composed operation</em>. The
|
||
|
|
* program must ensure that the stream performs no other read operations (such
|
||
|
|
* as async_read, the stream's async_read_some function, or any other composed
|
||
|
|
* operations that perform reads) until this operation completes.
|
||
|
|
*
|
||
|
|
* @param s The stream from which the data is to be read. The type must support
|
||
|
|
* the AsyncReadStream concept.
|
||
|
|
*
|
||
|
|
* @param buffers The dynamic buffer sequence into which the data will be read.
|
||
|
|
* Although the buffers object may be copied as necessary, ownership of the
|
||
|
|
* underlying memory blocks is retained by the caller, which must guarantee
|
||
|
|
* that they remain valid until the completion handler is called.
|
||
|
|
*
|
||
|
|
* @param completion_condition The function object to be called to determine
|
||
|
|
* whether the read operation is complete. The signature of the function object
|
||
|
|
* must be:
|
||
|
|
* @code std::size_t completion_condition(
|
||
|
|
* // Result of latest async_read_some operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes transferred so far.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* A return value of 0 indicates that the read operation is complete. A non-zero
|
||
|
|
* return value indicates the maximum number of bytes to be read on the next
|
||
|
|
* call to the stream's async_read_some function.
|
||
|
|
*
|
||
|
|
* @param token The @ref completion_token that will be used to produce a
|
||
|
|
* completion handler, which will be called when the read completes.
|
||
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
||
|
|
* @ref yield_context, or a function object with the correct completion
|
||
|
|
* signature. The function signature of the completion handler must be:
|
||
|
|
* @code void handler(
|
||
|
|
* // Result of operation.
|
||
|
|
* const asio::error_code& error,
|
||
|
|
*
|
||
|
|
* // Number of bytes copied into the buffers. If an error
|
||
|
|
* // occurred, this will be the number of bytes successfully
|
||
|
|
* // transferred prior to the error.
|
||
|
|
* std::size_t bytes_transferred
|
||
|
|
* ); @endcode
|
||
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
||
|
|
* not, the completion handler will not be invoked from within this function.
|
||
|
|
* On immediate completion, invocation of the handler will be performed in a
|
||
|
|
* manner equivalent to using asio::post().
|
||
|
|
*
|
||
|
|
* @par Completion Signature
|
||
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
||
|
|
*
|
||
|
|
* @par Per-Operation Cancellation
|
||
|
|
* This asynchronous operation supports cancellation for the following
|
||
|
|
* asio::cancellation_type values:
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::terminal
|
||
|
|
*
|
||
|
|
* @li @c cancellation_type::partial
|
||
|
|
*
|
||
|
|
* if they are also supported by the @c AsyncReadStream type's
|
||
|
|
* @c async_read_some operation.
|
||
|
|
*/
|
||
|
|
template <typename AsyncReadStream,
|
||
|
|
typename DynamicBuffer_v2, typename CompletionCondition,
|
||
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
||
|
|
std::size_t)) ReadToken
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(
|
||
|
|
typename AsyncReadStream::executor_type)>
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
||
|
|
void (asio::error_code, std::size_t))
|
||
|
|
async_read(AsyncReadStream& s, DynamicBuffer_v2 buffers,
|
||
|
|
CompletionCondition completion_condition,
|
||
|
|
ASIO_MOVE_ARG(ReadToken) token
|
||
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(
|
||
|
|
typename AsyncReadStream::executor_type),
|
||
|
|
typename constraint<
|
||
|
|
is_dynamic_buffer_v2<DynamicBuffer_v2>::value
|
||
|
|
>::type = 0)
|
||
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
||
|
|
async_initiate<ReadToken,
|
||
|
|
void (asio::error_code, std::size_t)>(
|
||
|
|
declval<detail::initiate_async_read_dynbuf_v2<AsyncReadStream> >(),
|
||
|
|
token, ASIO_MOVE_CAST(DynamicBuffer_v2)(buffers),
|
||
|
|
ASIO_MOVE_CAST(CompletionCondition)(completion_condition))));
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
} // namespace asio
|
||
|
|
|
||
|
|
#include "asio/detail/pop_options.hpp"
|
||
|
|
|
||
|
|
#include "asio/impl/read.hpp"
|
||
|
|
|
||
|
|
#endif // ASIO_READ_HPP
|