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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2022 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::nil
Description
A zero-sized class without any storage. Used, for example, in HashSet.
Note:
A zero-sized class actually does still require at least 1 byte storage.
\*---------------------------------------------------------------------------*/
#ifndef nil_H
#define nil_H
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
// Forward declaration of classes
class Istream;
class Ostream;
// Forward declaration of friend functions and operators
class nil;
Istream& operator>>(Istream&, nil&);
Ostream& operator<<(Ostream&, const nil&);
/*---------------------------------------------------------------------------*\
Class nil Declaration
\*---------------------------------------------------------------------------*/
class nil
{
public:
// Constructors
//- Construct null
nil()
{}
//- Construct from Istream
nil(Istream&)
{}
// IOstream Operators
friend Istream& operator>>(Istream& is, nil&)
{
return is;
}
friend Ostream& operator<<(Ostream& os, const nil&)
{
return os;
}
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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