Saf/Algo/Selector.h

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/*
    This file is part of Simple Application Framework (Saf) library.
    Copyright (C) 2010 - 2012 Ondrej Danek <ondrej.danek@gmail.com>

    This library 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.

    Saf 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 Simple Application Framework library. If not, 
    see <http://www.gnu.org/licenses/>.
*/

#ifndef SAF_ALGO_SELECTOR_H
#define SAF_ALGO_SELECTOR_H

#include "Function.h"

namespace Saf
{
    namespace Algo
    {
        namespace Selector
        {
            template <class PairClass>
            struct FirstMember
                : public UnaryFunction<PairClass, typename PairClass::FirstMemberType>
            {
                typename PairClass::FirstMemberType& operator()(PairClass& pr) const
                {
                    return pr.m_first;
                }

                const typename PairClass::FirstMemberType& operator()(const PairClass& pr) const
                {
                    return pr.m_first;
                }
            };

            template <class PairClass>
            struct SecondMember
                : public UnaryFunction<PairClass, typename PairClass::SecondMemberType>
            {
                typename PairClass::SecondMemberType& operator()(PairClass& pr) const
                {
                    return pr.m_second;
                }

                const typename PairClass::SecondMemberType& operator()(const PairClass& pr) const
                {
                    return pr.m_second;
                }
            };

            template <class TripletClass>
            struct ThirdMember
                : public UnaryFunction<TripletClass, typename TripletClass::ThirdMemberType>
            {
                typename TripletClass::ThirdMemberType& operator()(TripletClass& pr) const
                {
                    return pr.m_third;
                }

                const typename TripletClass::ThirdMemberType& operator()(const TripletClass& pr) const
                {
                    return pr.m_third;
                }
            };
        }
    }
}

#endif