Sming provides a set of Stream class which extend :cppStream methods.
:cppIDataSourceStream is used where read-only access is required. It introduces the :cppIDataSourceStream::readMemoryBlock method which performs a regular read without updating the stream position. This allows optimistic reading and re-sending, but cannot be handled by some stream types and should be used with care.
:cppReadWriteStream is used where read/write operation is required.