ENH: fvMeshSubset: added check

src/finiteVolume/fvMesh/fvMeshSubset/fvMeshSubset.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2012 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -1371,6 +1371,12 @@ void Foam::fvMeshSubset::setLargeCellSubset
 }
 
 
+bool Foam::fvMeshSubset::hasSubMesh() const
+{
+    return fvMeshSubsetPtr_.valid();
+}
+
+
 const fvMesh& Foam::fvMeshSubset::subMesh() const
 {
     checkCellSubset();

src/finiteVolume/fvMesh/fvMeshSubset/fvMeshSubset.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2012 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -268,6 +268,9 @@ public:
                 return baseMesh_;
             }
 
+            //- Have subMesh?
+            bool hasSubMesh() const;
+
             //- Return reference to subset mesh
             const fvMesh& subMesh() const;