clampextender.h

// Description: Clamping index extended
// Documentation: indexextenders.txt

#ifndef PASTELSYS_CLAMPEXTENDER_H
#define PASTELSYS_CLAMPEXTENDER_H

#include "pastel/sys/extender/indexextender.h"

#include <cmath>

namespace Pastel
{

    class ClampExtender
        : public IndexExtender
    {
    public:
        virtual ~ClampExtender()
        {
        }

        virtual integer operator()(
            integer index, integer extent) const
        {
            if (index < 0)
            {
                return 0;
            }

            if (index >= extent)
            {
                return extent - 1;
            }

            return index;
        }
    };

    using ClampExtenderPtr = CountedPtr<ClampExtender>;
    using ConstClampExtenderPtr = CountedPtr<const ClampExtender>;

    //inline ClampExtenderPtr clampExtender()
    inline ConstIndexExtenderPtr clampExtender()
    {
        return ClampExtenderPtr(new ClampExtender);
    }

}

#endif