exprDriverOps.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  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/>.
 
Namespace
    Foam::expressions::exprDriverOps
 
Description
    Miscellaneous operations used in combination with the
    expressions::exprDriver
 
SourceFiles
    exprDriverOps.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef expressions_exprDriverOps_H
#define expressions_exprDriverOps_H
 
#include "scalarOps.H"
#include "FieldOps.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace expressions
{
namespace exprDriverOps
{
 
/*---------------------------------------------------------------------------*\
                     Namespace exprDriverOps Declarations
\*---------------------------------------------------------------------------*/
 
//- A modulo operation similar to that used in swak4foam
//  This operation produces values in the -1/2 to +1/2 range.
struct swakModuloOp
{
    scalar operator()(const scalar& a, const scalar& b) const
    {
        if (Foam::mag(b) < ROOTVSMALL)
        {
            return 0;
        }
 
        const scalar val = std::fmod(a, b);
 
        if (Foam::mag(val) > (0.5*b))
        {
            if (val > 0)
            {
                return (val - b);
            }
            else
            {
                return (val + b);
            }
        }
 
        return val;
    }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace exprDriverOps
} // End namespace expressions
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //