ENH: boundaryMesh - allow not found state in findPatchID

src/OpenFOAM/meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C

@@ -656,7 +656,11 @@ Foam::label Foam::polyBoundaryMesh::findIndex(const keyType& key) const
 }
 
 
-Foam::label Foam::polyBoundaryMesh::findPatchID(const word& patchName) const
+Foam::label Foam::polyBoundaryMesh::findPatchID
+(
+    const word& patchName,
+    bool allowNotFound
+) const
 {
     const polyPatchList& patches = *this;
 
@@ -668,6 +672,20 @@ Foam::label Foam::polyBoundaryMesh::findPatchID(const word& patchName) const
         }
     }
 
+    if (!allowNotFound)
+    {
+        string regionStr("");
+        if (mesh_.name() != polyMesh::defaultRegion)
+        {
+            regionStr = "in region '" + mesh_.name() + "' ";
+        }
+
+        FatalErrorInFunction
+            << "Patch '" << patchName << "' not found. "
+            << "Available patch names " << regionStr << "include: " << names()
+            << exit(FatalError);
+    }
+
     // Patch not found
     if (debug)
     {

src/OpenFOAM/meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.H

@@ -171,7 +171,11 @@ public:
         label findIndex(const keyType&) const;
 
         //- Find patch index given a name
-        label findPatchID(const word& patchName) const;
+        label findPatchID
+        (
+            const word& patchName,
+            const bool allowNotFound = true
+        ) const;
 
         //- Find patch indices for a given polyPatch type
         template<class Type>