borderedconstview.h

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

#ifndef PASTELSYS_BORDEREDCONSTVIEW_H
#define PASTELSYS_BORDEREDCONSTVIEW_H

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

namespace Pastel
{

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

        using Element = typename Contained_ConstView::Element;

        BorderedConstView()
            : view_()
            , border_()
        {
        }

        explicit BorderedConstView(
            const Contained_ConstView& view,
            const Element& border)
            : view_(view)
            , border_(border)
        {
        }

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

        const Element& operator()(
            const Vector<integer, N>& position) const
        {
            if (anyLess(position, 0) ||
                anyGreaterEqual(position, view_.extent()))
            {
                return border_;
            }

            return view_(position);
        }

    private:
        Contained_ConstView view_;
        Element border_;
    };

    template <integer N, typename Input_Element, typename Input_ConstView>
    ExtendedConstView<N, Input_Element,
        BorderedConstView<N, ConstView<N, Input_Element, Input_ConstView> > >
        borderedConstView(
        const ConstView<N, Input_Element, Input_ConstView>& view,
        const NoDeduction<Input_Element>& border)
    {
        return extendedConstView<N>(BorderedConstView<
            N, ConstView<N, Input_Element, Input_ConstView> >(view, border));
    }

}

#endif