refCount.H

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/*---------------------------------------------------------------------------*\
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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.
 
    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::refCount
 
Description
    Reference counter for various OpenFOAM components.
 
See also
    Foam::tmp
    Foam::token::compound
 
\*---------------------------------------------------------------------------*/
 
#ifndef refCount_H
#define refCount_H
 
#include "bool.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                          Class refCount Declaration
\*---------------------------------------------------------------------------*/
 
class refCount
{
    // Private Data
 
        int count_;
 
 
protected:
 
    // Constructors
 
        //- Construct null initialising count to 0
        refCount()
        :
            count_(0)
        {}
 
        //- Disallow copy
        refCount(const refCount&) = delete;
 
 
public:
 
    // Member Functions
 
        //- Return the current reference count
        int count() const
        {
            return count_;
        }
 
        //- Return true if the reference count is zero
        bool unique() const
        {
            return count_ == 0;
        }
 
 
    // Member Operators
 
        //- Increment the reference count
        void operator++()
        {
            count_++;
        }
 
        //- Increment the reference count
        void operator++(int)
        {
            count_++;
        }
 
        //- Decrement the reference count
        void operator--()
        {
            count_--;
        }
 
        //- Decrement the reference count
        void operator--(int)
        {
            count_--;
        }
 
        //- Disallow bitwise assignment
        void operator=(const refCount&) = delete;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //