ENH: Add static identity members to primitive types

src/OpenFOAM/primitives/SymmTensor/SymmTensor.H

@@ -79,6 +79,7 @@ public:
         static const SymmTensor one;
         static const SymmTensor max;
         static const SymmTensor min;
+        static const SymmTensor I;
 
 
     //- Component labeling enumeration

src/OpenFOAM/primitives/SymmTensor/symmTensor/symmTensor.C

@@ -75,6 +75,14 @@ const symmTensor symmTensor::min
                       -VGREAT
 );
 
+template<>
+const symmTensor symmTensor::I
+(
+    1, 0, 0,
+       1, 0,
+          1
+);
+
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 

src/OpenFOAM/primitives/Tensor/Tensor.H

@@ -82,6 +82,7 @@ public:
         static const Tensor one;
         static const Tensor max;
         static const Tensor min;
+        static const Tensor I;
 
 
     //- Component labeling enumeration

src/OpenFOAM/primitives/Tensor/tensor/tensor.C

@@ -76,6 +76,14 @@ const tensor tensor::min
     -VGREAT, -VGREAT, -VGREAT
 );
 
+template<>
+const tensor tensor::I
+(
+    1, 0, 0,
+    0, 1, 0,
+    0, 0, 1
+);
+
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 

src/OpenFOAM/primitives/Tensor2D/Tensor2D.H

@@ -75,6 +75,7 @@ public:
         static const Tensor2D one;
         static const Tensor2D max;
         static const Tensor2D min;
+        static const Tensor2D I;
 
 
     //- Component labeling enumeration

src/OpenFOAM/primitives/Tensor2D/tensor2D/tensor2D.C

@@ -70,6 +70,13 @@ const tensor2D tensor2D::min
     -VGREAT, -VGREAT
 );
 
+template<>
+const tensor2D tensor2D::I
+(
+    1, 0,
+    0, 1
+);
+
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //