ENH: driver/parser/scanner for patch expressions

src/finiteVolume/expressions/patch/patchExprDriverI.H

@@ -0,0 +1,50 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2019 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+inline Foam::label Foam::expressions::patchExpr::parseDriver::size
+(
+    const FieldAssociation geoType
+) const
+{
+    switch (geoType)
+    {
+        case FieldAssociation::POINT_DATA :
+            return patch_.patch().nPoints();
+            break;
+        case FieldAssociation::SURFACE_DATA :
+            return patch_.patch().size();
+            break;
+        default:
+            break;
+    }
+    return 0;
+}
+
+
+// ************************************************************************* //