clampedconstview.h

// Description: An extended view using a clamped border
// Documentation: extendedconstviews.txt

#ifndef PASTELSYS_CLAMPEDCONSTVIEW_H
#define PASTELSYS_CLAMPEDCONSTVIEW_H

#include "pastel/sys/view/extendedconstview.h"
#include "pastel/sys/view/view.h"
#include "pastel/sys/vector/vector_tools.h"

namespace Pastel
{

    template <integer N, typename Contained_ConstView>
    class ClampedConstView
    {
    public:
        static constexpr int Dimension = N;

        using Element = typename Contained_ConstView::Element;

        ClampedConstView()
            : view_()
        {
        }

        explicit ClampedConstView(
            const Contained_ConstView& view)
            : view_(view)
        {
        }

        const Vector<integer, N>& extent() const
        {
            return view_.extent();
        }

        const Element& operator()(
            const Vector<integer, N>& position) const
        {
            return view_(Vector<integer, N>(clamp(position,
                Vector<integer, N>(0), evaluate(view_.extent() - 1))));
        }

    private:
        Contained_ConstView view_;
    };

    template <integer N, typename Input_Element, typename Input_ConstView>
    ExtendedConstView<N, Input_Element, ClampedConstView<N, ConstView<N, Input_Element, Input_ConstView> > >

        clampedConstView(const ConstView<N, Input_Element, Input_ConstView>& view)
    {
        return extendedConstView<N>(ClampedConstView<N,
            ConstView<N, Input_Element, Input_ConstView> >(view));
    }

}

#endif