BloombergLP::bdlma::BufferManager::expand

Increase the amount of memory allocated at the specified address from the original size (in bytes) to also include the maximum amount remaining in the buffer. Return the amount of memory available at address after expanding, or size if the memory at address cannot be expanded. This method can only expand the memory block returned by the most recent allocate or allocateRaw request from this buffer manager, and otherwise has no effect. The behavior is undefined unless the memory at address was originally allocated by this buffer manager, the size of the memory at address is size, and release was not called after allocating the memory at address.