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Write all of the supplied data to a stream before returning.
template<
    typename SyncWriteStream,
    typename Allocator>
std::size_t write(
    SyncWriteStream & s,
    basic_streambuf< Allocator > & b);
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:
basic_streambuf
              has been written.
            This operation is implemented in terms of zero or more calls to the stream's write_some function.
The stream to which the data is to be written. The type must support the SyncWriteStream concept.
                The basic_streambuf
                object from which data will be written.
              
The number of bytes transferred.
Thrown on failure.
This overload is equivalent to calling:
boost::asio::write(
    s, b,
    boost::asio::transfer_all());