zeroFieldField.H

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/*---------------------------------------------------------------------------*\
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    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
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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

// ************************************************************************* //