backed-map:: access as a method

arbitrile.cpp

@@ -1529,6 +1529,8 @@ struct hrmap_arbi : hrmap {
   heptagon *origin;
   heptagon *getOrigin() override { return origin; }
 
+  backed_map* get_backmap() override { return &bm; }
+
   hrmap_arbi() {
     dynamicval<hrmap*> curmap(currentmap, this);
     origin = init_heptagon(current.shapes[0].size());

archimedean.cpp

@@ -577,6 +577,8 @@ struct hrmap_archimedean : hrmap {
   heptagon *origin;
   heptagon *getOrigin() override { return origin; }
 
+  backed_map* get_backmap() override { return &bm; }
+
   hrmap_archimedean() {
     dynamicval<hrmap*> curmap(currentmap, this);
     int id = DUAL ? current.N * 2 : 0;;

cell.cpp

@@ -97,6 +97,8 @@ public:
   /** this takes a large closed manifold M that is a quotient of this, and returns a unique identifier of the cell corresponding to M
    *  returns PATTERN_INVALID if not implemented or impossible */
   virtual int pattern_value(cell *c) { return PATTERN_INVALID; }
+
+  virtual struct backed_map* get_backmap() { return nullptr; }
   };
 
 /** hrmaps which are based on regular non-Euclidean 2D tilings, possibly quotient