async_write (6 of 8 overloads)

Start an asynchronous operation to write a certain amount of data to a stream.

template<
    typename AsyncWriteStream,
    typename Allocator,
    typename CompletionCondition,
    typename WriteToken>
DEDUCED async_write(
    AsyncWriteStream & s,
    basic_streambuf< Allocator > & b,
    CompletionCondition completion_condition,
    WriteToken && token);

This function is used to asynchronously write a certain number of bytes of data to a stream. It is an initiating function for an asynchronous operation, and always returns immediately. The asynchronous operation will continue 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 async_write_some function, and is known as a composed operation. 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.

Parameters

s

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

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.

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 async_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 async_write_some function.

token

The completion token that will be used to produce a completion handler, which will be called when the write completes. Potential completion tokens include use_future, use_awaitable, yield_context, or a function object with the correct completion signature. The function signature of the completion handler must be:

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
);

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 post.

Completion Signature

void(asio::error_code, std::size_t)

Per-Operation Cancellation

This asynchronous operation supports cancellation for the following cancellation_type values:

cancellation_type::terminal
cancellation_type::partial

if they are also supported by the AsyncWriteStream type's async_write_some operation.