556 lines
22 KiB
C++
556 lines
22 KiB
C++
//
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// write_at.hpp
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// ~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_WRITE_AT_HPP
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#define ASIO_WRITE_AT_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/push_options.hpp"
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#include "asio/detail/push_options.hpp"
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#include <cstddef>
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#include <boost/config.hpp>
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#include <boost/cstdint.hpp>
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#include "asio/detail/pop_options.hpp"
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#include "asio/basic_streambuf.hpp"
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#include "asio/error.hpp"
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namespace asio {
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/**
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* @defgroup write_at asio::write_at
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*
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* @brief Write a certain amount of data at a specified offset before returning.
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*/
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/*@{*/
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/// Write all of the supplied data at the specified offset before returning.
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/**
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* This function is used to write a certain number of bytes of data to a random
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* access device at a specified offset. The call will block until one of the
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* following conditions is true:
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*
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* @li All of the data in the supplied buffers has been written. That is, the
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* bytes transferred is equal to the sum of the buffer sizes.
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*
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* @li An error occurred.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* write_some_at function.
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*
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* @param d The device to which the data is to be written. The type must support
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* the SyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param buffers One or more buffers containing the data to be written. The sum
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* of the buffer sizes indicates the maximum number of bytes to write to the
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* device.
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*
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* @returns The number of bytes transferred.
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*
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* @throws asio::system_error Thrown on failure.
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*
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* @par Example
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* To write a single data buffer use the @ref buffer function as follows:
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* @code asio::write_at(d, 42, asio::buffer(data, size)); @endcode
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* See the @ref buffer documentation for information on writing multiple
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* buffers in one go, and how to use it with arrays, boost::array or
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* std::vector.
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*
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* @note This overload is equivalent to calling:
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* @code asio::write_at(
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* d, offset, buffers,
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* asio::transfer_all()); @endcode
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*/
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template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence>
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std::size_t write_at(SyncRandomAccessWriteDevice& d,
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boost::uint64_t offset, const ConstBufferSequence& buffers);
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/// Write a certain amount of data at a specified offset before returning.
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/**
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* This function is used to write a certain number of bytes of data to a random
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* access device at a specified offset. The call will block until one of the
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* following conditions is true:
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*
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* @li All of the data in the supplied buffers has been written. That is, the
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* bytes transferred is equal to the sum of the buffer sizes.
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*
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* @li The completion_condition function object returns true.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* write_some_at function.
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*
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* @param d The device to which the data is to be written. The type must support
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* the SyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param buffers One or more buffers containing the data to be written. The sum
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* of the buffer sizes indicates the maximum number of bytes to write to the
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* device.
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*
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* @param completion_condition The function object to be called to determine
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* whether the write operation is complete. The signature of the function object
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* must be:
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* @code std::size_t completion_condition(
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* // Result of latest write_some_at operation.
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* const asio::error_code& error,
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*
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* // Number of bytes transferred so far.
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* std::size_t bytes_transferred
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* ); @endcode
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* A return value of 0 indicates that the write operation is complete. A
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* non-zero return value indicates the maximum number of bytes to be written on
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* the next call to the device's write_some_at function.
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*
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* @returns The number of bytes transferred.
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*
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* @throws asio::system_error Thrown on failure.
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*
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* @par Example
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* To write a single data buffer use the @ref buffer function as follows:
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* @code asio::write_at(d, 42, asio::buffer(data, size),
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* asio::transfer_at_least(32)); @endcode
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* See the @ref buffer documentation for information on writing multiple
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* buffers in one go, and how to use it with arrays, boost::array or
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* std::vector.
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*/
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template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence,
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typename CompletionCondition>
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std::size_t write_at(SyncRandomAccessWriteDevice& d,
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boost::uint64_t offset, const ConstBufferSequence& buffers,
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CompletionCondition completion_condition);
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/// Write a certain amount of data at a specified offset before returning.
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/**
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* This function is used to write a certain number of bytes of data to a random
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* access device at a specified offset. The call will block until one of the
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* following conditions is true:
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*
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* @li All of the data in the supplied buffers has been written. That is, the
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* bytes transferred is equal to the sum of the buffer sizes.
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*
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* @li The completion_condition function object returns true.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* write_some_at function.
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*
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* @param d The device to which the data is to be written. The type must support
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* the SyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param buffers One or more buffers containing the data to be written. The sum
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* of the buffer sizes indicates the maximum number of bytes to write to the
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* device.
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*
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* @param completion_condition The function object to be called to determine
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* whether the write operation is complete. The signature of the function object
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* must be:
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* @code std::size_t completion_condition(
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* // Result of latest write_some_at operation.
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* const asio::error_code& error,
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*
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* // Number of bytes transferred so far.
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* std::size_t bytes_transferred
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* ); @endcode
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* A return value of 0 indicates that the write operation is complete. A
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* non-zero return value indicates the maximum number of bytes to be written on
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* the next call to the device's write_some_at function.
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*
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* @param ec Set to indicate what error occurred, if any.
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*
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* @returns The number of bytes written. If an error occurs, returns the total
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* number of bytes successfully transferred prior to the error.
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*/
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template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence,
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typename CompletionCondition>
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std::size_t write_at(SyncRandomAccessWriteDevice& d,
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boost::uint64_t offset, const ConstBufferSequence& buffers,
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CompletionCondition completion_condition, asio::error_code& ec);
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/// Write all of the supplied data at the specified offset before returning.
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/**
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* This function is used to write a certain number of bytes of data to a random
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* access device at a specified offset. The call will block until one of the
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* following conditions is true:
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*
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* @li All of the data in the supplied basic_streambuf has been written.
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*
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* @li An error occurred.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* write_some_at function.
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*
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* @param d The device to which the data is to be written. The type must support
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* the SyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param b The basic_streambuf object from which data will be written.
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*
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* @returns The number of bytes transferred.
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*
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* @throws asio::system_error Thrown on failure.
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*
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* @note This overload is equivalent to calling:
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* @code asio::write_at(
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* d, 42, b,
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* asio::transfer_all()); @endcode
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*/
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template <typename SyncRandomAccessWriteDevice, typename Allocator>
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std::size_t write_at(SyncRandomAccessWriteDevice& d,
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boost::uint64_t offset, basic_streambuf<Allocator>& b);
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/// Write a certain amount of data at a specified offset before returning.
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/**
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* This function is used to write a certain number of bytes of data to a random
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* access device at a specified offset. The call will block until one of the
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* following conditions is true:
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*
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* @li All of the data in the supplied basic_streambuf has been written.
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*
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* @li The completion_condition function object returns true.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* write_some_at function.
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*
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* @param d The device to which the data is to be written. The type must support
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* the SyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param b The basic_streambuf object from which data will be written.
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*
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* @param completion_condition The function object to be called to determine
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* whether the write operation is complete. The signature of the function object
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* must be:
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* @code std::size_t completion_condition(
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* // Result of latest write_some_at operation.
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* const asio::error_code& error,
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*
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* // Number of bytes transferred so far.
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* std::size_t bytes_transferred
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* ); @endcode
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* A return value of 0 indicates that the write operation is complete. A
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* non-zero return value indicates the maximum number of bytes to be written on
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* the next call to the device's write_some_at function.
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*
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* @returns The number of bytes transferred.
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*
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* @throws asio::system_error Thrown on failure.
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*/
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template <typename SyncRandomAccessWriteDevice, typename Allocator,
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typename CompletionCondition>
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std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset,
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basic_streambuf<Allocator>& b, CompletionCondition completion_condition);
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/// Write a certain amount of data at a specified offset before returning.
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/**
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* This function is used to write a certain number of bytes of data to a random
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* access device at a specified offset. The call will block until one of the
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* following conditions is true:
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*
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* @li All of the data in the supplied basic_streambuf has been written.
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*
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* @li The completion_condition function object returns true.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* write_some_at function.
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*
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* @param d The device to which the data is to be written. The type must support
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* the SyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param b The basic_streambuf object from which data will be written.
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*
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* @param completion_condition The function object to be called to determine
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* whether the write operation is complete. The signature of the function object
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* must be:
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* @code std::size_t completion_condition(
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* // Result of latest write_some_at operation.
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* const asio::error_code& error,
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*
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* // Number of bytes transferred so far.
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* std::size_t bytes_transferred
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* ); @endcode
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* A return value of 0 indicates that the write operation is complete. A
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* non-zero return value indicates the maximum number of bytes to be written on
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* the next call to the device's write_some_at function.
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*
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* @param ec Set to indicate what error occurred, if any.
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*
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* @returns The number of bytes written. If an error occurs, returns the total
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* number of bytes successfully transferred prior to the error.
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*/
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template <typename SyncRandomAccessWriteDevice, typename Allocator,
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typename CompletionCondition>
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std::size_t write_at(SyncRandomAccessWriteDevice& d, boost::uint64_t offset,
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basic_streambuf<Allocator>& b, CompletionCondition completion_condition,
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asio::error_code& ec);
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/*@}*/
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/**
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* @defgroup async_write_at asio::async_write_at
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*
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* @brief Start an asynchronous operation to write a certain amount of data at
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* the specified offset.
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*/
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/*@{*/
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/// Start an asynchronous operation to write all of the supplied data at the
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/// specified offset.
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/**
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* This function is used to asynchronously write a certain number of bytes of
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* data to a random access device at a specified offset. The function call
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* always returns immediately. The asynchronous operation will continue until
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* one of the following conditions is true:
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*
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* @li All of the data in the supplied buffers has been written. That is, the
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* bytes transferred is equal to the sum of the buffer sizes.
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*
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* @li An error occurred.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* async_write_some_at function.
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*
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* @param d The device to which the data is to be written. The type must support
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* the AsyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param buffers One or more buffers containing the data to be written.
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* Although the buffers object may be copied as necessary, ownership of the
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* underlying memory blocks is retained by the caller, which must guarantee
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* that they remain valid until the handler is called.
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*
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* @param handler The handler to be called when the write operation completes.
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* Copies will be made of the handler as required. The function signature of
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* the handler must be:
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* @code void handler(
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* // Result of operation.
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* const asio::error_code& error,
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*
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* // Number of bytes written from the buffers. If an error
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* // occurred, this will be less than the sum of the buffer sizes.
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* std::size_t bytes_transferred
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* ); @endcode
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* Regardless of whether the asynchronous operation completes immediately or
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* not, the handler will not be invoked from within this function. Invocation of
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* the handler will be performed in a manner equivalent to using
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* asio::io_service::post().
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*
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* @par Example
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* To write a single data buffer use the @ref buffer function as follows:
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* @code
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* asio::async_write_at(d, 42, asio::buffer(data, size), handler);
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* @endcode
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* See the @ref buffer documentation for information on writing multiple
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* buffers in one go, and how to use it with arrays, boost::array or
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* std::vector.
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*/
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template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
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typename WriteHandler>
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void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset,
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const ConstBufferSequence& buffers, WriteHandler handler);
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/// Start an asynchronous operation to write a certain amount of data at the
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/// specified offset.
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/**
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* This function is used to asynchronously write a certain number of bytes of
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* data to a random access device at a specified offset. The function call
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* always returns immediately. The asynchronous operation will continue until
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* one of the following conditions is true:
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*
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* @li All of the data in the supplied buffers has been written. That is, the
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* bytes transferred is equal to the sum of the buffer sizes.
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*
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* @li The completion_condition function object returns true.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* async_write_some_at function.
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*
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* @param d The device to which the data is to be written. The type must support
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* the AsyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param buffers One or more buffers containing the data to be written.
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* Although the buffers object may be copied as necessary, ownership of the
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* underlying memory blocks is retained by the caller, which must guarantee
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* that they remain valid until the handler is called.
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*
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* @param completion_condition The function object to be called to determine
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* whether the write operation is complete. The signature of the function object
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* must be:
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* @code std::size_t completion_condition(
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* // Result of latest async_write_some_at operation.
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* const asio::error_code& error,
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*
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* // Number of bytes transferred so far.
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* std::size_t bytes_transferred
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* ); @endcode
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* A return value of 0 indicates that the write operation is complete. A
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* non-zero return value indicates the maximum number of bytes to be written on
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* the next call to the device's async_write_some_at function.
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*
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* @param handler The handler to be called when the write operation completes.
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* Copies will be made of the handler as required. The function signature of the
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* handler must be:
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* @code void handler(
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* // Result of operation.
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* const asio::error_code& error,
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*
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* // Number of bytes written from the buffers. If an error
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* // occurred, this will be less than the sum of the buffer sizes.
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* std::size_t bytes_transferred
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* ); @endcode
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* Regardless of whether the asynchronous operation completes immediately or
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|
* not, the handler will not be invoked from within this function. Invocation of
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|
* the handler will be performed in a manner equivalent to using
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* asio::io_service::post().
|
|
*
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|
* @par Example
|
|
* To write a single data buffer use the @ref buffer function as follows:
|
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* @code asio::async_write_at(d, 42,
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* asio::buffer(data, size),
|
|
* asio::transfer_at_least(32),
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|
* handler); @endcode
|
|
* See the @ref buffer documentation for information on writing multiple
|
|
* buffers in one go, and how to use it with arrays, boost::array or
|
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* std::vector.
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*/
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template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
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typename CompletionCondition, typename WriteHandler>
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void async_write_at(AsyncRandomAccessWriteDevice& d,
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boost::uint64_t offset, const ConstBufferSequence& buffers,
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CompletionCondition completion_condition, WriteHandler handler);
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/// Start an asynchronous operation to write all of the supplied data at the
|
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/// specified offset.
|
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/**
|
|
* This function is used to asynchronously write a certain number of bytes of
|
|
* data to a random access device at a specified offset. The function call
|
|
* always returns immediately. The asynchronous operation will continue until
|
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* one of the following conditions is true:
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|
*
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* @li All of the data in the supplied basic_streambuf has been written.
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*
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* @li An error occurred.
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*
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* This operation is implemented in terms of zero or more calls to the device's
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* async_write_some_at function.
|
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*
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* @param d The device to which the data is to be written. The type must support
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|
* the AsyncRandomAccessWriteDevice concept.
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*
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* @param offset The offset at which the data will be written.
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*
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* @param b A basic_streambuf object from which data will be written. Ownership
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* of the streambuf is retained by the caller, which must guarantee that it
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* remains valid until the handler is called.
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*
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* @param handler The handler to be called when the write operation completes.
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* Copies will be made of the handler as required. The function signature of the
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* handler must be:
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* @code void handler(
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* // Result of operation.
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* const asio::error_code& error,
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*
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* // Number of bytes written from the buffers. If an error
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* // occurred, this will be less than the sum of the buffer sizes.
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* std::size_t bytes_transferred
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* ); @endcode
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* Regardless of whether the asynchronous operation completes immediately or
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* not, the handler will not be invoked from within this function. Invocation of
|
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* the handler will be performed in a manner equivalent to using
|
|
* asio::io_service::post().
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|
*/
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|
template <typename AsyncRandomAccessWriteDevice, typename Allocator,
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|
typename WriteHandler>
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void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset,
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basic_streambuf<Allocator>& b, WriteHandler handler);
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|
|
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/// Start an asynchronous operation to write a certain amount of data at the
|
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/// specified offset.
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|
/**
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|
* This function is used to asynchronously write a certain number of bytes of
|
|
* data to a random access device at a specified offset. The function call
|
|
* always returns immediately. The asynchronous operation will continue until
|
|
* one of the following conditions is true:
|
|
*
|
|
* @li All of the data in the supplied basic_streambuf has been written.
|
|
*
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|
* @li The completion_condition function object returns true.
|
|
*
|
|
* This operation is implemented in terms of zero or more calls to the device's
|
|
* async_write_some_at function.
|
|
*
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* @param d The device to which the data is to be written. The type must support
|
|
* the AsyncRandomAccessWriteDevice concept.
|
|
*
|
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* @param offset The offset at which the data will be written.
|
|
*
|
|
* @param b A basic_streambuf object from which data will be written. Ownership
|
|
* of the streambuf is retained by the caller, which must guarantee that it
|
|
* remains valid until the handler is called.
|
|
*
|
|
* @param completion_condition The function object to be called to determine
|
|
* whether the write operation is complete. The signature of the function object
|
|
* must be:
|
|
* @code std::size_t completion_condition(
|
|
* // Result of latest async_write_some_at 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 write operation is complete. A
|
|
* non-zero return value indicates the maximum number of bytes to be written on
|
|
* the next call to the device's async_write_some_at function.
|
|
*
|
|
* @param handler The handler to be called when the write operation completes.
|
|
* Copies will be made of the handler as required. The function signature of the
|
|
* handler must be:
|
|
* @code void handler(
|
|
* // Result of operation.
|
|
* const asio::error_code& error,
|
|
*
|
|
* // Number of bytes written from the buffers. If an error
|
|
* // occurred, this will be less than the sum of the buffer sizes.
|
|
* std::size_t bytes_transferred
|
|
* ); @endcode
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
|
* not, the handler will not be invoked from within this function. Invocation of
|
|
* the handler will be performed in a manner equivalent to using
|
|
* asio::io_service::post().
|
|
*/
|
|
template <typename AsyncRandomAccessWriteDevice, typename Allocator,
|
|
typename CompletionCondition, typename WriteHandler>
|
|
void async_write_at(AsyncRandomAccessWriteDevice& d, boost::uint64_t offset,
|
|
basic_streambuf<Allocator>& b, CompletionCondition completion_condition,
|
|
WriteHandler handler);
|
|
|
|
/*@}*/
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/impl/write_at.ipp"
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // ASIO_WRITE_AT_HPP
|