/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2017-2026 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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/>.

Class
    Foam::Function1s::ZeroConstant

Description
    Templated function that returns the corresponding 0 (zero).

Usage
    \verbatim
        <name> zero;
    \endverbatim

SourceFiles
    ZeroConstant.C

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

#ifndef ZeroConstant_H
#define ZeroConstant_H

#include "Function1.H"

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

namespace Foam
{
namespace Function1s
{

/*---------------------------------------------------------------------------*\
                        Class ZeroConstant Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class ZeroConstant
:
    public FieldFunction1<Type, ZeroConstant<Type>>
{

public:

    // Runtime type information
    TypeName("zero");


    // Constructors

        //- Construct from name
        ZeroConstant(const word& name);

        //- Construct from name and dictionary
        ZeroConstant
        (
            const word& name,
            const unitSets& units,
            const dictionary& dict
        );


    //- Destructor
    virtual ~ZeroConstant();


    // Member Functions

        //- Return zero
        virtual inline Type value(const scalar x) const;

        //- Return zero
        virtual inline Type derivative(const scalar x) const;

        //- Return zero
        virtual inline Type integral(const scalar x1, const scalar x2) const;

        //- Write in dictionary format
        virtual void write(Ostream& os, const unitSets& units) const;


    // Member Operators

        //- Disallow default bitwise assignment
        void operator=(const ZeroConstant<Type>&) = delete;
};


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

} // End namespace Function1s
} // End namespace Foam

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

#include "ZeroConstantI.H"

#ifdef NoRepository
    #include "ZeroConstant.C"
#endif

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

#endif

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