Identity: Added cast to scalar

src/OpenFOAM/primitives/SphericalTensor/Identity.H

@@ -25,8 +25,8 @@ Class
     Foam::Identity
 
 Description
-    Templated identity and dual space identity tensors
-    derived from SphericalTensor.
+    Templated identity and dual space identity tensors derived from
+    SphericalTensor.
 
 \*---------------------------------------------------------------------------*/
 
@@ -75,9 +75,19 @@ public:
     {
         return dual();
     }
+
+    //- Return 1 for scalar
+    inline operator scalar() const
+    {
+        return 1;
+    }
 };
 
 
+// Global Identity tensor
+static const Identity<scalar> I;
+
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 } // End namespace Foam

src/OpenFOAM/primitives/SphericalTensor/sphericalTensor/sphericalTensor.H

@@ -48,13 +48,9 @@ namespace Foam
 
 typedef SphericalTensor<scalar> sphericalTensor;
 
-// Identity tensor
-static const Identity<scalar> I;
-
 static const sphericalTensor oneThirdI(1.0/3.0);
 static const sphericalTensor twoThirdsI(2.0/3.0);
 
-
 //- Specify data associated with sphericalTensor type are contiguous
 template<>
 inline bool contiguous<sphericalTensor>() {return true;}