zero.H

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2020 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::zero
 
Description
    A class representing the concept of 0 used to avoid unnecessary
    manipulations for objects that are known to be zero at compile-time.
 
SourceFiles
    zeroI.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef zero_H
#define zero_H
 
#include "label.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                            Class zero Declaration
\*---------------------------------------------------------------------------*/
 
class zero
{
public:
 
    typedef zero value_type;
 
    // Constructors
 
        //- Construct null
        zero()
        {}
 
 
    // Member Operators
 
        //- Return 0 for bool
        inline operator bool() const
        {
            return 0;
        }
 
        //- Return 0 for label
        inline operator label() const
        {
            return 0;
        }
 
        //- Return 0 for float
        inline operator float() const
        {
            return 0;
        }
 
        //- Return 0 for double
        inline operator double() const
        {
            return 0;
        }
 
        //- Return 0 for double
        inline operator long double() const
        {
            return 0;
        }
};
 
 
// Global zero
static const zero Zero;
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "zeroI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //