BloombergLP::bdlma::SequentialPool::truncate

Reduce the amount of memory allocated at the specified address of the specified originalSize (in bytes) to the specified newSize. Return newSize after truncating, or originalSize if the memory block at address cannot be truncated. This method can only truncate the memory block returned by the most recent allocate request from this memory pool, and otherwise has no effect. The behavior is undefined unless the memory block at address was originally allocated by this memory pool, the size of the memory block at address is originalSize, newSize <= originalSize, and release was not called after allocating the memory block at address.