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편집 파일: write.hpp

// // write.hpp // ~~~~~~~~~ // // Copyright (c) 2003-2024 Christopher M. Kohlhoff (chris at kohlhoff dot com) // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // #ifndef BOOST_ASIO_WRITE_HPP #define BOOST_ASIO_WRITE_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/config.hpp> #include <cstddef> #include <boost/asio/async_result.hpp> #include <boost/asio/buffer.hpp> #include <boost/asio/completion_condition.hpp> #include <boost/asio/error.hpp> #if !defined(BOOST_ASIO_NO_EXTENSIONS) # include <boost/asio/basic_streambuf_fwd.hpp> #endif // !defined(BOOST_ASIO_NO_EXTENSIONS) #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { namespace detail { template <typename> class initiate_async_write; #if !defined(BOOST_ASIO_NO_DYNAMIC_BUFFER_V1) template <typename> class initiate_async_write_dynbuf_v1; #endif // !defined(BOOST_ASIO_NO_DYNAMIC_BUFFER_V1) template <typename> class initiate_async_write_dynbuf_v2; } // namespace detail /** * @defgroup write boost::asio::write * * @brief The @c write function is a composed operation that writes a certain * amount of data to a stream before returning. */ /*@{*/ /// Write all of the supplied data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied buffers has been written. 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 * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers One or more buffers containing the data to be written. The sum * of the buffer sizes indicates the maximum number of bytes to write to the * stream. * * @returns The number of bytes transferred. * * @throws boost::system::system_error Thrown on failure. * * @par Example * To write a single data buffer use the @ref buffer function as follows: * @code boost::asio::write(s, boost::asio::buffer(data, size)); @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 * std::vector. * * @note This overload is equivalent to calling: * @code boost::asio::write( * s, buffers, * boost::asio::transfer_all()); @endcode */ template <typename SyncWriteStream, typename ConstBufferSequence> std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers, constraint_t< is_const_buffer_sequence<ConstBufferSequence>::value > = 0); /// Write all of the supplied data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied buffers has been written. 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 * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers One or more buffers containing the data to be written. The sum * of the buffer sizes indicates the maximum number of bytes to write to the * stream. * * @param ec Set to indicate what error occurred, if any. * * @returns The number of bytes transferred. * * @par Example * To write a single data buffer use the @ref buffer function as follows: * @code boost::asio::write(s, boost::asio::buffer(data, size), ec); @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 * std::vector. * * @note This overload is equivalent to calling: * @code boost::asio::write( * s, buffers, * boost::asio::transfer_all(), ec); @endcode */ template <typename SyncWriteStream, typename ConstBufferSequence> std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers, boost::system::error_code& ec, constraint_t< is_const_buffer_sequence<ConstBufferSequence>::value > = 0); /// Write a certain amount of data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied buffers has been written. 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 * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers One or more buffers containing the data to be written. The sum * of the buffer sizes indicates the maximum number of bytes to write to the * stream. * * @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 write_some operation. * const boost::system::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 stream's write_some function. * * @returns The number of bytes transferred. * * @throws boost::system::system_error Thrown on failure. * * @par Example * To write a single data buffer use the @ref buffer function as follows: * @code boost::asio::write(s, boost::asio::buffer(data, size), * boost::asio::transfer_at_least(32)); @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 * std::vector. */ template <typename SyncWriteStream, typename ConstBufferSequence, typename CompletionCondition> std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers, CompletionCondition completion_condition, constraint_t< is_const_buffer_sequence<ConstBufferSequence>::value > = 0); /// Write a certain amount of data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied buffers has been written. 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 * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers One or more buffers containing the data to be written. The sum * of the buffer sizes indicates the maximum number of bytes to write to the * stream. * * @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 write_some operation. * const boost::system::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 stream's write_some function. * * @param ec Set to indicate what error occurred, if any. * * @returns The number of bytes written. If an error occurs, returns the total * number of bytes successfully transferred prior to the error. */ template <typename SyncWriteStream, typename ConstBufferSequence, typename CompletionCondition> std::size_t write(SyncWriteStream& s, const ConstBufferSequence& buffers, CompletionCondition completion_condition, boost::system::error_code& ec, constraint_t< is_const_buffer_sequence<ConstBufferSequence>::value > = 0); #if !defined(BOOST_ASIO_NO_DYNAMIC_BUFFER_V1) /// Write all of the supplied data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied dynamic buffer sequence has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * Successfully written data is automatically consumed from the buffers. * * @returns The number of bytes transferred. * * @throws boost::system::system_error Thrown on failure. * * @note This overload is equivalent to calling: * @code boost::asio::write( * s, buffers, * boost::asio::transfer_all()); @endcode */ template <typename SyncWriteStream, typename DynamicBuffer_v1> std::size_t write(SyncWriteStream& s, DynamicBuffer_v1&& buffers, constraint_t< is_dynamic_buffer_v1<decay_t<DynamicBuffer_v1>>::value > = 0, constraint_t< !is_dynamic_buffer_v2<decay_t<DynamicBuffer_v1>>::value > = 0); /// Write all of the supplied data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied dynamic buffer sequence has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * Successfully written data is automatically consumed from the buffers. * * @param ec Set to indicate what error occurred, if any. * * @returns The number of bytes transferred. * * @note This overload is equivalent to calling: * @code boost::asio::write( * s, buffers, * boost::asio::transfer_all(), ec); @endcode */ template <typename SyncWriteStream, typename DynamicBuffer_v1> std::size_t write(SyncWriteStream& s, DynamicBuffer_v1&& buffers, boost::system::error_code& ec, constraint_t< is_dynamic_buffer_v1<decay_t<DynamicBuffer_v1>>::value > = 0, constraint_t< !is_dynamic_buffer_v2<decay_t<DynamicBuffer_v1>>::value > = 0); /// Write a certain amount of data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied dynamic buffer sequence has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * Successfully written data is automatically consumed from the buffers. * * @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 write_some operation. * const boost::system::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 stream's write_some function. * * @returns The number of bytes transferred. * * @throws boost::system::system_error Thrown on failure. */ template <typename SyncWriteStream, typename DynamicBuffer_v1, typename CompletionCondition> std::size_t write(SyncWriteStream& s, DynamicBuffer_v1&& buffers, CompletionCondition completion_condition, constraint_t< is_dynamic_buffer_v1<decay_t<DynamicBuffer_v1>>::value > = 0, constraint_t< !is_dynamic_buffer_v2<decay_t<DynamicBuffer_v1>>::value > = 0); /// Write a certain amount of data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied dynamic buffer sequence has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * Successfully written data is automatically consumed from the buffers. * * @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 write_some operation. * const boost::system::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 stream's write_some function. * * @param ec Set to indicate what error occurred, if any. * * @returns The number of bytes written. If an error occurs, returns the total * number of bytes successfully transferred prior to the error. */ template <typename SyncWriteStream, typename DynamicBuffer_v1, typename CompletionCondition> std::size_t write(SyncWriteStream& s, DynamicBuffer_v1&& buffers, CompletionCondition completion_condition, boost::system::error_code& ec, constraint_t< is_dynamic_buffer_v1<decay_t<DynamicBuffer_v1>>::value > = 0, constraint_t< !is_dynamic_buffer_v2<decay_t<DynamicBuffer_v1>>::value > = 0); #if !defined(BOOST_ASIO_NO_EXTENSIONS) #if !defined(BOOST_ASIO_NO_IOSTREAM) /// Write all of the supplied data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied basic_streambuf has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param b The basic_streambuf object from which data will be written. * * @returns The number of bytes transferred. * * @throws boost::system::system_error Thrown on failure. * * @note This overload is equivalent to calling: * @code boost::asio::write( * s, b, * boost::asio::transfer_all()); @endcode */ template <typename SyncWriteStream, typename Allocator> std::size_t write(SyncWriteStream& s, basic_streambuf<Allocator>& b); /// Write all of the supplied data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied basic_streambuf has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param b The basic_streambuf object from which data will be written. * * @param ec Set to indicate what error occurred, if any. * * @returns The number of bytes transferred. * * @note This overload is equivalent to calling: * @code boost::asio::write( * s, b, * boost::asio::transfer_all(), ec); @endcode */ template <typename SyncWriteStream, typename Allocator> std::size_t write(SyncWriteStream& s, basic_streambuf<Allocator>& b, boost::system::error_code& ec); /// Write a certain amount of data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied basic_streambuf has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param b The basic_streambuf object from which data will be written. * * @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 write_some operation. * const boost::system::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 stream's write_some function. * * @returns The number of bytes transferred. * * @throws boost::system::system_error Thrown on failure. */ template <typename SyncWriteStream, typename Allocator, typename CompletionCondition> std::size_t write(SyncWriteStream& s, basic_streambuf<Allocator>& b, CompletionCondition completion_condition); /// Write a certain amount of data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied basic_streambuf has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param b The basic_streambuf object from which data will be written. * * @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 write_some operation. * const boost::system::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 stream's write_some function. * * @param ec Set to indicate what error occurred, if any. * * @returns The number of bytes written. If an error occurs, returns the total * number of bytes successfully transferred prior to the error. */ template <typename SyncWriteStream, typename Allocator, typename CompletionCondition> std::size_t write(SyncWriteStream& s, basic_streambuf<Allocator>& b, CompletionCondition completion_condition, boost::system::error_code& ec); #endif // !defined(BOOST_ASIO_NO_IOSTREAM) #endif // !defined(BOOST_ASIO_NO_EXTENSIONS) #endif // !defined(BOOST_ASIO_NO_DYNAMIC_BUFFER_V1) /// Write all of the supplied data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied dynamic buffer sequence has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * Successfully written data is automatically consumed from the buffers. * * @returns The number of bytes transferred. * * @throws boost::system::system_error Thrown on failure. * * @note This overload is equivalent to calling: * @code boost::asio::write( * s, buffers, * boost::asio::transfer_all()); @endcode */ template <typename SyncWriteStream, typename DynamicBuffer_v2> std::size_t write(SyncWriteStream& s, DynamicBuffer_v2 buffers, constraint_t< is_dynamic_buffer_v2<DynamicBuffer_v2>::value > = 0); /// Write all of the supplied data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied dynamic buffer sequence has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * Successfully written data is automatically consumed from the buffers. * * @param ec Set to indicate what error occurred, if any. * * @returns The number of bytes transferred. * * @note This overload is equivalent to calling: * @code boost::asio::write( * s, buffers, * boost::asio::transfer_all(), ec); @endcode */ template <typename SyncWriteStream, typename DynamicBuffer_v2> std::size_t write(SyncWriteStream& s, DynamicBuffer_v2 buffers, boost::system::error_code& ec, constraint_t< is_dynamic_buffer_v2<DynamicBuffer_v2>::value > = 0); /// Write a certain amount of data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied dynamic buffer sequence has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * Successfully written data is automatically consumed from the buffers. * * @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 write_some operation. * const boost::system::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 stream's write_some function. * * @returns The number of bytes transferred. * * @throws boost::system::system_error Thrown on failure. */ template <typename SyncWriteStream, typename DynamicBuffer_v2, typename CompletionCondition> std::size_t write(SyncWriteStream& s, DynamicBuffer_v2 buffers, CompletionCondition completion_condition, constraint_t< is_dynamic_buffer_v2<DynamicBuffer_v2>::value > = 0); /// Write a certain amount of data to a stream before returning. /** * This function is used to write a certain number of bytes of data to a stream. * The call will block until one of the following conditions is true: * * @li All of the data in the supplied dynamic buffer sequence has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * write_some function. * * @param s The stream to which the data is to be written. The type must support * the SyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * Successfully written data is automatically consumed from the buffers. * * @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 write_some operation. * const boost::system::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 stream's write_some function. * * @param ec Set to indicate what error occurred, if any. * * @returns The number of bytes written. If an error occurs, returns the total * number of bytes successfully transferred prior to the error. */ template <typename SyncWriteStream, typename DynamicBuffer_v2, typename CompletionCondition> std::size_t write(SyncWriteStream& s, DynamicBuffer_v2 buffers, CompletionCondition completion_condition, boost::system::error_code& ec, constraint_t< is_dynamic_buffer_v2<DynamicBuffer_v2>::value > = 0); /*@}*/ /** * @defgroup async_write boost::asio::async_write * * @brief The @c async_write function is a composed asynchronous operation that * writes a certain amount of data to a stream before completion. */ /*@{*/ /// Start an asynchronous operation to write all of the supplied data to a /// stream. /** * This function is used to asynchronously write a certain number of bytes of * data to 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 All of the data in the supplied buffers has been written. 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_write_some function, and is known as a <em>composed operation</em>. The * program must ensure that the stream performs no other write operations (such * as async_write, the stream's async_write_some function, or any other composed * operations that perform writes) until this operation completes. * * @param s The stream to which the data is to be written. The type must support * the AsyncWriteStream concept. * * @param buffers One or more buffers containing the data to be written. * 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 write 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 boost::system::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 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 boost::asio::post(). * * @par Completion Signature * @code void(boost::system::error_code, std::size_t) @endcode * * @par Example * To write a single data buffer use the @ref buffer function as follows: * @code * boost::asio::async_write(s, boost::asio::buffer(data, size), 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 * std::vector. * * @par Per-Operation Cancellation * This asynchronous operation supports cancellation for the following * boost::asio::cancellation_type values: * * @li @c cancellation_type::terminal * * @li @c cancellation_type::partial * * if they are also supported by the @c AsyncWriteStream type's * @c async_write_some operation. */ template <typename AsyncWriteStream, typename ConstBufferSequence, BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, std::size_t)) WriteToken = default_completion_token_t<typename AsyncWriteStream::executor_type>> auto async_write(AsyncWriteStream& s, const ConstBufferSequence& buffers, WriteToken&& token = default_completion_token_t<typename AsyncWriteStream::executor_type>(), constraint_t< is_const_buffer_sequence<ConstBufferSequence>::value > = 0) -> decltype( async_initiate<WriteToken, void (boost::system::error_code, std::size_t)>( declval<detail::initiate_async_write<AsyncWriteStream>>(), token, buffers, transfer_all())); /// Start an asynchronous operation to write a certain amount of data to a /// stream. /** * This function is used to asynchronously write a certain number of bytes of * data to 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 All of the data in the supplied buffers has been written. 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 * async_write_some function, and is known as a <em>composed operation</em>. The * program must ensure that the stream performs no other write operations (such * as async_write, the stream's async_write_some function, or any other composed * operations that perform writes) until this operation completes. * * @param s The stream to which the data is to be written. The type must support * the AsyncWriteStream concept. * * @param buffers One or more buffers containing the data to be written. * 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 write operation is complete. The signature of the function object * must be: * @code std::size_t completion_condition( * // Result of latest async_write_some operation. * const boost::system::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 stream's async_write_some function. * * @param token The @ref completion_token that will be used to produce a * completion handler, which will be called when the write 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 boost::system::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 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 boost::asio::post(). * * @par Completion Signature * @code void(boost::system::error_code, std::size_t) @endcode * * @par Example * To write a single data buffer use the @ref buffer function as follows: * @code boost::asio::async_write(s, * boost::asio::buffer(data, size), * boost::asio::transfer_at_least(32), * 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 * std::vector. * * @par Per-Operation Cancellation * This asynchronous operation supports cancellation for the following * boost::asio::cancellation_type values: * * @li @c cancellation_type::terminal * * @li @c cancellation_type::partial * * if they are also supported by the @c AsyncWriteStream type's * @c async_write_some operation. */ template <typename AsyncWriteStream, typename ConstBufferSequence, typename CompletionCondition, BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, std::size_t)) WriteToken> auto async_write(AsyncWriteStream& s, const ConstBufferSequence& buffers, CompletionCondition completion_condition, WriteToken&& token, constraint_t< is_const_buffer_sequence<ConstBufferSequence>::value > = 0) -> decltype( async_initiate<WriteToken, void (boost::system::error_code, std::size_t)>( declval<detail::initiate_async_write<AsyncWriteStream>>(), token, buffers, static_cast<CompletionCondition&&>(completion_condition))); #if !defined(BOOST_ASIO_NO_DYNAMIC_BUFFER_V1) /// Start an asynchronous operation to write all of the supplied data to a /// stream. /** * This function is used to asynchronously write a certain number of bytes of * data to 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 All of the data in the supplied dynamic buffer sequence has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * async_write_some function, and is known as a <em>composed operation</em>. The * program must ensure that the stream performs no other write operations (such * as async_write, the stream's async_write_some function, or any other composed * operations that perform writes) until this operation completes. * * @param s The stream to which the data is to be written. The type must support * the AsyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * 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. Successfully * written data is automatically consumed from the buffers. * * @param token The @ref completion_token that will be used to produce a * completion handler, which will be called when the write 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 boost::system::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 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 boost::asio::post(). * * @par Completion Signature * @code void(boost::system::error_code, std::size_t) @endcode * * @par Per-Operation Cancellation * This asynchronous operation supports cancellation for the following * boost::asio::cancellation_type values: * * @li @c cancellation_type::terminal * * @li @c cancellation_type::partial * * if they are also supported by the @c AsyncWriteStream type's * @c async_write_some operation. */ template <typename AsyncWriteStream, typename DynamicBuffer_v1, BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, std::size_t)) WriteToken = default_completion_token_t<typename AsyncWriteStream::executor_type>> auto async_write(AsyncWriteStream& s, DynamicBuffer_v1&& buffers, WriteToken&& token = default_completion_token_t<typename AsyncWriteStream::executor_type>(), constraint_t< is_dynamic_buffer_v1<decay_t<DynamicBuffer_v1>>::value > = 0, constraint_t< !is_dynamic_buffer_v2<decay_t<DynamicBuffer_v1>>::value > = 0) -> decltype( async_initiate<WriteToken, void (boost::system::error_code, std::size_t)>( declval<detail::initiate_async_write_dynbuf_v1<AsyncWriteStream>>(), token, static_cast<DynamicBuffer_v1&&>(buffers), transfer_all())); /// Start an asynchronous operation to write a certain amount of data to a /// stream. /** * This function is used to asynchronously write a certain number of bytes of * data to 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 All of the data in the supplied dynamic buffer sequence has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * async_write_some function, and is known as a <em>composed operation</em>. The * program must ensure that the stream performs no other write operations (such * as async_write, the stream's async_write_some function, or any other composed * operations that perform writes) until this operation completes. * * @param s The stream to which the data is to be written. The type must support * the AsyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * 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. Successfully * written data is automatically consumed from the buffers. * * @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 operation. * const boost::system::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 stream's async_write_some function. * * @param token The @ref completion_token that will be used to produce a * completion handler, which will be called when the write 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 boost::system::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 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 boost::asio::post(). * * @par Completion Signature * @code void(boost::system::error_code, std::size_t) @endcode * * @par Per-Operation Cancellation * This asynchronous operation supports cancellation for the following * boost::asio::cancellation_type values: * * @li @c cancellation_type::terminal * * @li @c cancellation_type::partial * * if they are also supported by the @c AsyncWriteStream type's * @c async_write_some operation. */ template <typename AsyncWriteStream, typename DynamicBuffer_v1, typename CompletionCondition, BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, std::size_t)) WriteToken> auto async_write(AsyncWriteStream& s, DynamicBuffer_v1&& buffers, CompletionCondition completion_condition, WriteToken&& token, constraint_t< is_dynamic_buffer_v1<decay_t<DynamicBuffer_v1>>::value > = 0, constraint_t< !is_dynamic_buffer_v2<decay_t<DynamicBuffer_v1>>::value > = 0) -> decltype( async_initiate<WriteToken, void (boost::system::error_code, std::size_t)>( declval<detail::initiate_async_write_dynbuf_v1<AsyncWriteStream>>(), token, static_cast<DynamicBuffer_v1&&>(buffers), static_cast<CompletionCondition&&>(completion_condition))); #if !defined(BOOST_ASIO_NO_EXTENSIONS) #if !defined(BOOST_ASIO_NO_IOSTREAM) /// Start an asynchronous operation to write all of the supplied data to a /// stream. /** * This function is used to asynchronously write a certain number of bytes of * data to 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 All of the data in the supplied basic_streambuf has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * async_write_some function, and is known as a <em>composed operation</em>. The * program must ensure that the stream performs no other write operations (such * as async_write, the stream's async_write_some function, or any other composed * operations that perform writes) until this operation completes. * * @param s The stream to which the data is to be written. The type must support * the AsyncWriteStream concept. * * @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 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 write 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 boost::system::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 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 boost::asio::post(). * * @par Completion Signature * @code void(boost::system::error_code, std::size_t) @endcode * * @par Per-Operation Cancellation * This asynchronous operation supports cancellation for the following * boost::asio::cancellation_type values: * * @li @c cancellation_type::terminal * * @li @c cancellation_type::partial * * if they are also supported by the @c AsyncWriteStream type's * @c async_write_some operation. */ template <typename AsyncWriteStream, typename Allocator, BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, std::size_t)) WriteToken = default_completion_token_t<typename AsyncWriteStream::executor_type>> auto async_write(AsyncWriteStream& s, basic_streambuf<Allocator>& b, WriteToken&& token = default_completion_token_t<typename AsyncWriteStream::executor_type>()) -> decltype( async_initiate<WriteToken, void (boost::system::error_code, std::size_t)>( declval<detail::initiate_async_write_dynbuf_v1<AsyncWriteStream>>(), token, basic_streambuf_ref<Allocator>(b), transfer_all())); /// Start an asynchronous operation to write a certain amount of data to a /// stream. /** * This function is used to asynchronously write a certain number of bytes of * data to 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 All of the data in the supplied basic_streambuf has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * async_write_some function, and is known as a <em>composed operation</em>. The * program must ensure that the stream performs no other write operations (such * as async_write, the stream's async_write_some function, or any other composed * operations that perform writes) until this operation completes. * * @param s The stream to which the data is to be written. The type must support * the AsyncWriteStream concept. * * @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 completion 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 operation. * const boost::system::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 stream's async_write_some function. * * @param token The @ref completion_token that will be used to produce a * completion handler, which will be called when the write 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 boost::system::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 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 boost::asio::post(). * * @par Completion Signature * @code void(boost::system::error_code, std::size_t) @endcode * * @par Per-Operation Cancellation * This asynchronous operation supports cancellation for the following * boost::asio::cancellation_type values: * * @li @c cancellation_type::terminal * * @li @c cancellation_type::partial * * if they are also supported by the @c AsyncWriteStream type's * @c async_write_some operation. */ template <typename AsyncWriteStream, typename Allocator, typename CompletionCondition, BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, std::size_t)) WriteToken> auto async_write(AsyncWriteStream& s, basic_streambuf<Allocator>& b, CompletionCondition completion_condition, WriteToken&& token) -> decltype( async_initiate<WriteToken, void (boost::system::error_code, std::size_t)>( declval<detail::initiate_async_write_dynbuf_v1<AsyncWriteStream>>(), token, basic_streambuf_ref<Allocator>(b), static_cast<CompletionCondition&&>(completion_condition))); #endif // !defined(BOOST_ASIO_NO_IOSTREAM) #endif // !defined(BOOST_ASIO_NO_EXTENSIONS) #endif // !defined(BOOST_ASIO_NO_DYNAMIC_BUFFER_V1) /// Start an asynchronous operation to write all of the supplied data to a /// stream. /** * This function is used to asynchronously write a certain number of bytes of * data to 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 All of the data in the supplied dynamic buffer sequence has been written. * * @li An error occurred. * * This operation is implemented in terms of zero or more calls to the stream's * async_write_some function, and is known as a <em>composed operation</em>. The * program must ensure that the stream performs no other write operations (such * as async_write, the stream's async_write_some function, or any other composed * operations that perform writes) until this operation completes. * * @param s The stream to which the data is to be written. The type must support * the AsyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * 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. Successfully * written data is automatically consumed from the buffers. * * @param token The @ref completion_token that will be used to produce a * completion handler, which will be called when the write 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 boost::system::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 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 boost::asio::post(). * * @par Completion Signature * @code void(boost::system::error_code, std::size_t) @endcode * * @par Per-Operation Cancellation * This asynchronous operation supports cancellation for the following * boost::asio::cancellation_type values: * * @li @c cancellation_type::terminal * * @li @c cancellation_type::partial * * if they are also supported by the @c AsyncWriteStream type's * @c async_write_some operation. */ template <typename AsyncWriteStream, typename DynamicBuffer_v2, BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, std::size_t)) WriteToken = default_completion_token_t<typename AsyncWriteStream::executor_type>> auto async_write(AsyncWriteStream& s, DynamicBuffer_v2 buffers, WriteToken&& token = default_completion_token_t<typename AsyncWriteStream::executor_type>(), constraint_t< is_dynamic_buffer_v2<DynamicBuffer_v2>::value > = 0) -> decltype( async_initiate<WriteToken, void (boost::system::error_code, std::size_t)>( declval<detail::initiate_async_write_dynbuf_v2<AsyncWriteStream>>(), token, static_cast<DynamicBuffer_v2&&>(buffers), transfer_all())); /// Start an asynchronous operation to write a certain amount of data to a /// stream. /** * This function is used to asynchronously write a certain number of bytes of * data to 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 All of the data in the supplied dynamic buffer sequence has been written. * * @li The completion_condition function object returns 0. * * This operation is implemented in terms of zero or more calls to the stream's * async_write_some function, and is known as a <em>composed operation</em>. The * program must ensure that the stream performs no other write operations (such * as async_write, the stream's async_write_some function, or any other composed * operations that perform writes) until this operation completes. * * @param s The stream to which the data is to be written. The type must support * the AsyncWriteStream concept. * * @param buffers The dynamic buffer sequence from which data will be written. * 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. Successfully * written data is automatically consumed from the buffers. * * @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 operation. * const boost::system::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 stream's async_write_some function. * * @param token The @ref completion_token that will be used to produce a * completion handler, which will be called when the write 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 boost::system::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 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 boost::asio::post(). * * @par Completion Signature * @code void(boost::system::error_code, std::size_t) @endcode * * @par Per-Operation Cancellation * This asynchronous operation supports cancellation for the following * boost::asio::cancellation_type values: * * @li @c cancellation_type::terminal * * @li @c cancellation_type::partial * * if they are also supported by the @c AsyncWriteStream type's * @c async_write_some operation. */ template <typename AsyncWriteStream, typename DynamicBuffer_v2, typename CompletionCondition, BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code, std::size_t)) WriteToken> auto async_write(AsyncWriteStream& s, DynamicBuffer_v2 buffers, CompletionCondition completion_condition, WriteToken&& token, constraint_t< is_dynamic_buffer_v2<DynamicBuffer_v2>::value > = 0) -> decltype( async_initiate<WriteToken, void (boost::system::error_code, std::size_t)>( declval<detail::initiate_async_write_dynbuf_v2<AsyncWriteStream>>(), token, static_cast<DynamicBuffer_v2&&>(buffers), static_cast<CompletionCondition&&>(completion_condition))); /*@}*/ } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #include <boost/asio/impl/write.hpp> #endif // BOOST_ASIO_WRITE_HPP