/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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//  copy or use the software.
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//
//                           License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
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// are permitted provided that the following conditions are met:
//
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//     derived from this software without specific prior written permission.
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//M*/

#ifndef __RING_BUFFER_HPP__
#define __RING_BUFFER_HPP__

#include "precomp.hpp"

namespace cv
{
    namespace superres
    {
        namespace detail
        {
            template <typename T, class A>
            inline const T& at(int index, const std::vector<T, A>& items)
            {
                const int len = static_cast<int>(items.size());
                if (index < 0)
                    index -= ((index - len + 1) / len) * len;
                if (index >= len)
                    index %= len;
                return items[index];
            }

            template <typename T, class A>
            inline T& at(int index, std::vector<T, A>& items)
            {
                const int len = static_cast<int>(items.size());
                if (index < 0)
                    index -= ((index - len + 1) / len) * len;
                if (index >= len)
                    index %= len;
                return items[index];
            }
        }
    }
}

#endif // __RING_BUFFER_HPP__