LIFOStack.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2017-2022 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
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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    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::LIFOStack
 
Description
    A LIFO stack based on a singly-linked list.
 
    Stack operations are push(), pop(), top(), bottom().
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_LIFOStack_H
#define Foam_LIFOStack_H
 
#include "SLList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class LIFOStack Declaration
\*---------------------------------------------------------------------------*/
 
template<class T>
class LIFOStack
:
    public SLList<T>
{
public:
 
    // Constructors
 
        //- Inherit constructors from SLList
        using SLList<T>::SLList;
 
 
    // Member Functions
 
        //- Const reference to the top element
        const T& top() const
        {
            return this->first();
        }
 
        //- Const reference to the bottom element
        const T& bottom() const
        {
            return this->last();
        }
 
        //- Push an element onto the front of the stack
        void push(const T& elem)
        {
            this->prepend(elem);
        }
 
        //- Move an element onto the front of the stack
        void push(T&& elem)
        {
            this->prepend(std::move(elem));
        }
 
        //- Pop the top element off the stack
        T pop()
        {
            return this->removeHead();
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //