asio::write

The write function is a composed operation that writes a certain amount of data to a stream before returning. More...

Functions
template<typename SyncWriteStream , typename ConstBufferSequence >
std::size_t	asio::write (SyncWriteStream &s, const ConstBufferSequence &buffers, typename enable_if< is_const_buffer_sequence< ConstBufferSequence >::value >::type *=0)
	Write all of the supplied data to a stream before returning. More...
template<typename SyncWriteStream , typename ConstBufferSequence >
std::size_t	asio::write (SyncWriteStream &s, const ConstBufferSequence &buffers, asio::error_code &ec, typename enable_if< is_const_buffer_sequence< ConstBufferSequence >::value >::type *=0)
	Write all of the supplied data to a stream before returning. More...
template<typename SyncWriteStream , typename ConstBufferSequence , typename CompletionCondition >
std::size_t	asio::write (SyncWriteStream &s, const ConstBufferSequence &buffers, CompletionCondition completion_condition, typename enable_if< is_const_buffer_sequence< ConstBufferSequence >::value >::type *=0)
	Write a certain amount of data to a stream before returning. More...
template<typename SyncWriteStream , typename ConstBufferSequence , typename CompletionCondition >
std::size_t	asio::write (SyncWriteStream &s, const ConstBufferSequence &buffers, CompletionCondition completion_condition, asio::error_code &ec, typename enable_if< is_const_buffer_sequence< ConstBufferSequence >::value >::type *=0)
	Write a certain amount of data to a stream before returning. More...
template<typename SyncWriteStream , typename DynamicBuffer_v1 >
std::size_t	asio::write (SyncWriteStream &s, ASIO_MOVE_ARG(DynamicBuffer_v1) buffers, typename enable_if< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value &&!is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type *=0)
	Write all of the supplied data to a stream before returning. More...
template<typename SyncWriteStream , typename DynamicBuffer_v1 >
std::size_t	asio::write (SyncWriteStream &s, ASIO_MOVE_ARG(DynamicBuffer_v1) buffers, asio::error_code &ec, typename enable_if< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value &&!is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type *=0)
	Write all of the supplied data to a stream before returning. More...
template<typename SyncWriteStream , typename DynamicBuffer_v1 , typename CompletionCondition >
std::size_t	asio::write (SyncWriteStream &s, ASIO_MOVE_ARG(DynamicBuffer_v1) buffers, CompletionCondition completion_condition, typename enable_if< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value &&!is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type *=0)
	Write a certain amount of data to a stream before returning. More...
template<typename SyncWriteStream , typename DynamicBuffer_v1 , typename CompletionCondition >
std::size_t	asio::write (SyncWriteStream &s, ASIO_MOVE_ARG(DynamicBuffer_v1) buffers, CompletionCondition completion_condition, asio::error_code &ec, typename enable_if< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value &&!is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type *=0)
	Write a certain amount of data to a stream before returning. More...
template<typename SyncWriteStream , typename Allocator >
std::size_t	asio::write (SyncWriteStream &s, basic_streambuf< Allocator > &b)
	Write all of the supplied data to a stream before returning. More...
template<typename SyncWriteStream , typename Allocator >
std::size_t	asio::write (SyncWriteStream &s, basic_streambuf< Allocator > &b, asio::error_code &ec)
	Write all of the supplied data to a stream before returning. More...
template<typename SyncWriteStream , typename Allocator , typename CompletionCondition >
std::size_t	asio::write (SyncWriteStream &s, basic_streambuf< Allocator > &b, CompletionCondition completion_condition)
	Write a certain amount of data to a stream before returning. More...
template<typename SyncWriteStream , typename Allocator , typename CompletionCondition >
std::size_t	asio::write (SyncWriteStream &s, basic_streambuf< Allocator > &b, CompletionCondition completion_condition, asio::error_code &ec)
	Write a certain amount of data to a stream before returning. More...
template<typename SyncWriteStream , typename DynamicBuffer_v2 >
std::size_t	asio::write (SyncWriteStream &s, DynamicBuffer_v2 buffers, typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type *=0)
	Write all of the supplied data to a stream before returning. More...
template<typename SyncWriteStream , typename DynamicBuffer_v2 >
std::size_t	asio::write (SyncWriteStream &s, DynamicBuffer_v2 buffers, asio::error_code &ec, typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type *=0)
	Write all of the supplied data to a stream before returning. More...
template<typename SyncWriteStream , typename DynamicBuffer_v2 , typename CompletionCondition >
std::size_t	asio::write (SyncWriteStream &s, DynamicBuffer_v2 buffers, CompletionCondition completion_condition, typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type *=0)
	Write a certain amount of data to a stream before returning. More...
template<typename SyncWriteStream , typename DynamicBuffer_v2 , typename CompletionCondition >
std::size_t	asio::write (SyncWriteStream &s, DynamicBuffer_v2 buffers, CompletionCondition completion_condition, asio::error_code &ec, typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type *=0)
	Write a certain amount of data to a stream before returning. More...

Detailed Description

The write function is a composed operation that writes a certain amount of data to a stream before returning.

Function Documentation

write() [1/16]

template<typename SyncWriteStream , typename ConstBufferSequence , typename CompletionCondition >

std::size_t asio::write ( SyncWriteStream &  s, const ConstBufferSequence &  buffers, CompletionCondition  completion_condition, asio::error_code &  ec, typename enable_if< is_const_buffer_sequence< ConstBufferSequence >::value >::type *  = 0  )

inline

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:

• 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.

• 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.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
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.
completion_condition	The function object to be called to determine whether the write operation is complete. The signature of the function object must be: std::size_t completion_condition( // Result of latest write_some operation. const asio::error_code& error, // Number of bytes transferred so far. std::size_t bytes_transferred ); 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.
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.

write() [2/16]

template<typename SyncWriteStream , typename ConstBufferSequence >

std::size_t asio::write ( SyncWriteStream &  s, const ConstBufferSequence &  buffers, typename enable_if< is_const_buffer_sequence< ConstBufferSequence >::value >::type *  = 0  )

inline

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:

• 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.

• An error occurred.

This operation is implemented in terms of zero or more calls to the stream's write_some function.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
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.

Exceptions

asio::system_error

Thrown on failure.

Example

To write a single data buffer use the asio::buffer function as follows:

asio::write(s, asio::buffer(data, size)); 

See the asio::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:

asio::write(
   s, buffers,
   asio::transfer_all()); 

write() [3/16]

template<typename SyncWriteStream , typename ConstBufferSequence >

std::size_t asio::write ( SyncWriteStream &  s, const ConstBufferSequence &  buffers, asio::error_code &  ec, typename enable_if< is_const_buffer_sequence< ConstBufferSequence >::value >::type *  = 0  )

inline

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:

• 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.

• An error occurred.

This operation is implemented in terms of zero or more calls to the stream's write_some function.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
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.
ec	Set to indicate what error occurred, if any.

Returns

The number of bytes transferred.

Example

To write a single data buffer use the asio::buffer function as follows:

asio::write(s, asio::buffer(data, size), ec); 

See the asio::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:

asio::write(
   s, buffers,
   asio::transfer_all(), ec); 

write() [4/16]

template<typename SyncWriteStream , typename ConstBufferSequence , typename CompletionCondition >

std::size_t asio::write ( SyncWriteStream &  s, const ConstBufferSequence &  buffers, CompletionCondition  completion_condition, typename enable_if< is_const_buffer_sequence< ConstBufferSequence >::value >::type *  = 0  )

inline

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:

• 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.

• 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.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
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.
completion_condition	The function object to be called to determine whether the write operation is complete. The signature of the function object must be: std::size_t completion_condition( // Result of latest write_some operation. const asio::error_code& error, // Number of bytes transferred so far. std::size_t bytes_transferred ); 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.

Exceptions

asio::system_error

Thrown on failure.

Example

To write a single data buffer use the asio::buffer function as follows:

asio::write(s, asio::buffer(data, size),
   asio::transfer_at_least(32)); 

See the asio::buffer documentation for information on writing multiple buffers in one go, and how to use it with arrays, boost::array or std::vector.

write() [5/16]

template<typename SyncWriteStream , typename DynamicBuffer_v1 , typename CompletionCondition >

std::size_t asio::write	(	SyncWriteStream &	s,
		ASIO_MOVE_ARG(DynamicBuffer_v1)	buffers,
		CompletionCondition	completion_condition,
		asio::error_code &	ec,
		typename enable_if< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value &&!is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type *	= 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:

• All of the data in the supplied dynamic buffer sequence has been written.

• 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.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
buffers	The dynamic buffer sequence from which data will be written. Successfully written data is automatically consumed from the buffers.
completion_condition	The function object to be called to determine whether the write operation is complete. The signature of the function object must be: std::size_t completion_condition( // Result of latest write_some operation. const asio::error_code& error, // Number of bytes transferred so far. std::size_t bytes_transferred ); 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.
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.

write() [6/16]

template<typename SyncWriteStream , typename DynamicBuffer_v1 >

std::size_t asio::write ( SyncWriteStream &  s, ASIO_MOVE_ARG(DynamicBuffer_v1)  buffers, typename enable_if< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value &&!is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type *  = 0  )

inline

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:

• All of the data in the supplied dynamic buffer sequence has been written.

• An error occurred.

This operation is implemented in terms of zero or more calls to the stream's write_some function.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
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.

Exceptions

asio::system_error

Thrown on failure.

Note

This overload is equivalent to calling:

asio::write(
   s, buffers,
   asio::transfer_all()); 

write() [7/16]

template<typename SyncWriteStream , typename DynamicBuffer_v1 >

std::size_t asio::write ( SyncWriteStream &  s, ASIO_MOVE_ARG(DynamicBuffer_v1)  buffers, asio::error_code &  ec, typename enable_if< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value &&!is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type *  = 0  )

inline

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:

• All of the data in the supplied dynamic buffer sequence has been written.

• An error occurred.

This operation is implemented in terms of zero or more calls to the stream's write_some function.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
buffers	The dynamic buffer sequence from which data will be written. Successfully written data is automatically consumed from the buffers.
ec	Set to indicate what error occurred, if any.

Returns

The number of bytes transferred.

Note

This overload is equivalent to calling:

asio::write(
   s, buffers,
   asio::transfer_all(), ec); 

write() [8/16]

template<typename SyncWriteStream , typename DynamicBuffer_v1 , typename CompletionCondition >

std::size_t asio::write ( SyncWriteStream &  s, ASIO_MOVE_ARG(DynamicBuffer_v1)  buffers, CompletionCondition  completion_condition, typename enable_if< is_dynamic_buffer_v1< typename decay< DynamicBuffer_v1 >::type >::value &&!is_dynamic_buffer_v2< typename decay< DynamicBuffer_v1 >::type >::value >::type *  = 0  )

inline

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:

• All of the data in the supplied dynamic buffer sequence has been written.

• 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.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
buffers	The dynamic buffer sequence from which data will be written. Successfully written data is automatically consumed from the buffers.
completion_condition	The function object to be called to determine whether the write operation is complete. The signature of the function object must be: std::size_t completion_condition( // Result of latest write_some operation. const asio::error_code& error, // Number of bytes transferred so far. std::size_t bytes_transferred ); 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.

Exceptions

asio::system_error

Thrown on failure.

write() [9/16]

template<typename SyncWriteStream , typename Allocator , typename CompletionCondition >

std::size_t asio::write ( SyncWriteStream &  s, basic_streambuf< Allocator > &  b, CompletionCondition  completion_condition, asio::error_code &  ec  )

inline

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:

• All of the data in the supplied basic_streambuf has been written.

• 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.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
b	The basic_streambuf object from which data will be written.
completion_condition	The function object to be called to determine whether the write operation is complete. The signature of the function object must be: std::size_t completion_condition( // Result of latest write_some operation. const asio::error_code& error, // Number of bytes transferred so far. std::size_t bytes_transferred ); 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.
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.

write() [10/16]

template<typename SyncWriteStream , typename Allocator >

std::size_t asio::write ( SyncWriteStream &  s, basic_streambuf< Allocator > &  b  )

inline

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:

• All of the data in the supplied basic_streambuf has been written.

• An error occurred.

This operation is implemented in terms of zero or more calls to the stream's write_some function.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
b	The basic_streambuf object from which data will be written.

Returns

The number of bytes transferred.

Exceptions

asio::system_error

Thrown on failure.

Note

This overload is equivalent to calling:

asio::write(
   s, b,
   asio::transfer_all()); 

write() [11/16]

template<typename SyncWriteStream , typename Allocator >

std::size_t asio::write ( SyncWriteStream &  s, basic_streambuf< Allocator > &  b, asio::error_code &  ec  )

inline

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:

• All of the data in the supplied basic_streambuf has been written.

• An error occurred.

This operation is implemented in terms of zero or more calls to the stream's write_some function.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
b	The basic_streambuf object from which data will be written.
ec	Set to indicate what error occurred, if any.

Returns

The number of bytes transferred.

Note

This overload is equivalent to calling:

asio::write(
   s, b,
   asio::transfer_all(), ec); 

write() [12/16]

template<typename SyncWriteStream , typename Allocator , typename CompletionCondition >

std::size_t asio::write ( SyncWriteStream &  s, basic_streambuf< Allocator > &  b, CompletionCondition  completion_condition  )

inline

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:

• All of the data in the supplied basic_streambuf has been written.

• 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.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
b	The basic_streambuf object from which data will be written.
completion_condition	The function object to be called to determine whether the write operation is complete. The signature of the function object must be: std::size_t completion_condition( // Result of latest write_some operation. const asio::error_code& error, // Number of bytes transferred so far. std::size_t bytes_transferred ); 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.

Exceptions

asio::system_error

Thrown on failure.

write() [13/16]

template<typename SyncWriteStream , typename DynamicBuffer_v2 , typename CompletionCondition >

std::size_t asio::write	(	SyncWriteStream &	s,
		DynamicBuffer_v2	buffers,
		CompletionCondition	completion_condition,
		asio::error_code &	ec,
		typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type *	= 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:

• All of the data in the supplied dynamic buffer sequence has been written.

• 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.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
buffers	The dynamic buffer sequence from which data will be written. Successfully written data is automatically consumed from the buffers.
completion_condition	The function object to be called to determine whether the write operation is complete. The signature of the function object must be: std::size_t completion_condition( // Result of latest write_some operation. const asio::error_code& error, // Number of bytes transferred so far. std::size_t bytes_transferred ); 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.
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.

write() [14/16]

template<typename SyncWriteStream , typename DynamicBuffer_v2 >

std::size_t asio::write ( SyncWriteStream &  s, DynamicBuffer_v2  buffers, typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type *  = 0  )

inline

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:

• All of the data in the supplied dynamic buffer sequence has been written.

• An error occurred.

This operation is implemented in terms of zero or more calls to the stream's write_some function.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
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.

Exceptions

asio::system_error

Thrown on failure.

Note

This overload is equivalent to calling:

asio::write(
   s, buffers,
   asio::transfer_all()); 

write() [15/16]

template<typename SyncWriteStream , typename DynamicBuffer_v2 >

std::size_t asio::write ( SyncWriteStream &  s, DynamicBuffer_v2  buffers, asio::error_code &  ec, typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type *  = 0  )

inline

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:

• All of the data in the supplied dynamic buffer sequence has been written.

• An error occurred.

This operation is implemented in terms of zero or more calls to the stream's write_some function.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
buffers	The dynamic buffer sequence from which data will be written. Successfully written data is automatically consumed from the buffers.
ec	Set to indicate what error occurred, if any.

Returns

The number of bytes transferred.

Note

This overload is equivalent to calling:

asio::write(
   s, buffers,
   asio::transfer_all(), ec); 

write() [16/16]

template<typename SyncWriteStream , typename DynamicBuffer_v2 , typename CompletionCondition >

std::size_t asio::write ( SyncWriteStream &  s, DynamicBuffer_v2  buffers, CompletionCondition  completion_condition, typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type *  = 0  )

inline

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:

• All of the data in the supplied dynamic buffer sequence has been written.

• 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.

Parameters

s	The stream to which the data is to be written. The type must support the SyncWriteStream concept.
buffers	The dynamic buffer sequence from which data will be written. Successfully written data is automatically consumed from the buffers.
completion_condition	The function object to be called to determine whether the write operation is complete. The signature of the function object must be: std::size_t completion_condition( // Result of latest write_some operation. const asio::error_code& error, // Number of bytes transferred so far. std::size_t bytes_transferred ); 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.

Exceptions

asio::system_error

Thrown on failure.