step_indicator_director.h

// Description: Step-indicator director
// Documentation: director.txt

#ifndef PASTELSYS_STEP_INDICATOR_DIRECTOR_H
#define PASTELSYS_STEP_INDICATOR_DIRECTOR_H

#include "pastel/sys/indicator/step_indicator_concept.h"
#include "pastel/sys/director/director_concept.h"

namespace Pastel
{

    template <typename Step_Indicator>
    class Step_Indicator_Director
    {
    public:
        Step_Indicator_Director(const Step_Indicator& indicator)
            : indicator_(indicator)
        {
        }

        template <typename Integer>
        Integer operator()(const Integer& level) const
        {
            // Note that this is branchless.
            return level + !indicator_(level);
        };

    private:
        const Step_Indicator& indicator_;
    };

    template <typename Step_Indicator>
    Step_Indicator_Director<Step_Indicator> stepIndicatorDirector(
        const Step_Indicator& indicator)
    {
        return Step_Indicator_Director<Step_Indicator>(indicator);
    }

}

#endif