A dimension map is part of a distributed array descriptor. It is a map from a Location to an offset in a local data segment. Dimension maps are associated with particular parent ranges. They also incorporate a memory stride.
The public interface of the Map class is
struct Map {
Map() ;
Map(Range _range, const int _stride) ;
Map ker() const ;
Map shell() const ;
Range rng() const ;
int str() const ;
int offset(const Location& i) const ;
int disp(const int sub) const ;
int step(const int sub_stp) const ;
Range range ;
int stride ;
} ;