Predicate Tile Adapter Concept

Implementations of Predicate Tile Adapter Concept provide a mapping between a the elements of a tile_traits_concept and a Predicate Vector Concept.

Predicate Tile Adapter
  A Predicate Tile Adapter Concept satisfies the following expressions
  - at(int d, int h, int w, int c) - returns the value of a predicate corresponding to the access (d, h, w, c) within the tile.