Saf/Algo/Selection/Median.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_SELECTION_MEDIAN_H
#define SAF_ALGO_SELECTION_MEDIAN_H

#include "../Predicate.h"
#include "../Swap.h"

namespace Saf
{
    namespace Algo
    {
        namespace Selection
        {
            template <class T, class Pred>
            inline T Median(const T& x, const T& y, const T& z, Pred pred)
            {
                if (pred(x, y))
                {
                    if (pred(z, x))
                    {
                        return x;
                    }

                    return pred(z, y) ? z : y;
                }

                if (pred(z, y))
                {
                    return y;
                }

                return pred(z, x) ? z : x;
            }

            template <class T>
            inline T Median(const T& x, const T& y, const T& z)
            {
                typename Predicate::Less<T> pred;
                return Median(x, y, z, pred);
            }
        }
    }
}

#endif