Attempt to read a certain amount of data from a stream before returning.
template< typename SyncReadStream, typename Allocator> std::size_t read( SyncReadStream & s, basic_streambuf< Allocator > & b);
This function is used to read a certain number of bytes of data from a stream. The call will block until one of the following conditions is true:
This operation is implemented in terms of zero or more calls to the stream's read_some function.
The stream from which the data is to be read. The type must support the SyncReadStream concept.
object into which the data will be read.
The number of bytes transferred.
Thrown on failure.
This overload is equivalent to calling:
boost::asio::read( s, b, boost::asio::transfer_all());