Added ifEqEqAssignFirstOp into ops.H

Basically compares the two values and if they are not equal, assigns default
value to the first argument. Needed for syncing processor data in
polyhedralRefinement.

src/foam/primitives/ops/ops.H

@@ -377,6 +377,20 @@ template<class T>
 class greaterEqOp
 { public: T operator()(const T& x, const T& y) const { return x >= y; } };
 
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+template<class T, int defaultValue>
+class ifEqEqAssignFirstOp
+{
+public:
+
+    void operator()(T& x, const T& y) const
+    {
+            x = (x == y) ? x : defaultValue;
+    }
+};
+
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 } // End namespace Foam