zeroFieldField.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2019-2022 OpenCFD Ltd.
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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.
 
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    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
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Class
    Foam::zeroFieldField
 
Description
    A class representing the concept of a field of zeroFields used to
    avoid unnecessary manipulations for objects which are known to be zero at
    compile-time.
 
    Used for example as the density argument to a function written for
    compressible to be used for incompressible flow.
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_zeroFieldField_H
#define Foam_zeroFieldField_H
 
#include "zeroField.H"
#include "Pair.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                       Class zeroFieldField Declaration
\*---------------------------------------------------------------------------*/
 
class zeroFieldField
:
    public zero
{
public:
 
    // Constructors
 
        //- Default construct
        zeroFieldField() noexcept = default;
 
 
    // Member Operators
 
        //- Return the field
        zeroField operator[](const label) const noexcept
        {
            return zeroField{};
        }
 
        //- Return the field element
        zero operator[](const labelPair&) const noexcept
        {
            return zero{};
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //