Wrap model in order to create homogeneous model easily.

smp/src/bimap.h

@@ -69,6 +69,24 @@ public:
         return leftAssociation;
     }
     
+    void removeFromRight(const A& a)
+    {
+        for(auto& it : leftAssociation)
+            if(it->second == a)
+                leftAssociation.erase(it);
+        
+        rightAssociation.erase(a);
+    }
+    
+    void removeFromLeft(const B& b) 
+    {
+        for(auto& it : rightAssociation)
+            if(it->second == b)
+                rightAssociation.erase(it);
+        
+        leftAssociation.erase(b);
+    }
+    
     unsigned size() const
     {
         return leftAssociation.size();