pointer_locator.h

// Description: Pointer locator
// Documentation: locators.txt

#ifndef PASTELSYS_POINTER_LOCATOR_H
#define PASTELSYS_POINTER_LOCATOR_H

#include "pastel/sys/locator/locator_concept.h"
#include "pastel/sys/point/point_concept.h"
#include "pastel/sys/ensure.h"

namespace Pastel
{

    template <typename Real_, integer N_ = Dynamic>
    class Pointer_Locator
    {
    public:
        static constexpr integer N = N_;
        using Real = Real_;
        using Point = const Real*;

        explicit Pointer_Locator(integer n = ((N > 0) ? N : 0))
            : n_(n)
        {
            ENSURE(N == Dynamic || n == N);
            ENSURE_OP(n, >=, 0);
        }

        integer n() const
        {
            return n_;
        }

        integer n(const Point& point) const
        {
            return n();
        }

        const Real& operator()(Point point, integer i) const
        {
            PENSURE_OP(i, >=, 0);
            PENSURE_OP(i, <, n_);
            return point[i];
        }

    private:
        integer n_;
    };

    template <typename Real_, integer N_ = Dynamic>
    decltype(auto) pointerLocator(integer n = N_)
    {
        return Pointer_Locator<Real_, N_>(n);
    }

    template <typename Real>
    decltype(auto) pointerPoint(Real* point, integer n)
    {
        return location(
            point,
            Pointer_Locator<Real>(n));
    }

}

#endif