Motivation:
We'd like to separate the API and the implementation, so we can make other implementations in the future.
This will allow us to deliver the API changes without the new MemorySegment implementation.
Modification:
The MemoryManager interface abstracts away the implementation details of the concrete buffer type, and how to allocate and deallocate them.
Result:
Knowledge of MemorySegments are now confined to just the MemSegBuf and MemoryManager implementation classes.
