Create a KRRegion. If ParentAllocator is not NullAllocator, KRRegion's destructor will call parent.deallocate.
Capacity desired. This constructor is defined only if ParentAllocator is not NullAllocator.
See Implementation
Create a KRRegion. If ParentAllocator is not NullAllocator, KRRegion's destructor will call parent.deallocate.