/**********************************************************************

*

 * GEOS - Geometry Engine Open Source

 * http://geos.osgeo.org

 *

 * Copyright (C) 2026 ISciences, LLC

 *

 * This is free software; you can redistribute and/or modify it under

 * the terms of the GNU Lesser General Public Licence as published

 * by the Free Software Foundation.

 * See the COPYING file for more information.

 *

 **********************************************************************/

#pragma once

#include <memory>

#include <geos/export.h>

namespace geos::noding {

class ArcString;

}

namespace geos::noding {

/// The DirectionIndependentArcString is a thin wrapper over an ArcString that provides specialized

/// equality-testing and hashing functions. DirectionIndependentArcStrings are considered equal

/// if they cover the same path, regardless of direction. The control points of arcs are not required

/// to be identical, but must describe the same arc.

class GEOS_DLL DirectionIndependentArcString {

public:

    explicit DirectionIndependentArcString(const ArcString& as) : m_as(as) {}

    const ArcString& getArcString() const

    {

        return m_as;

    }

    bool operator==(const DirectionIndependentArcString& other) const;

private:

    const ArcString& m_as;

};

}

template<>

struct GEOS_DLL std::hash<geos::noding::DirectionIndependentArcString> {

    std::size_t operator()(const geos::noding::DirectionIndependentArcString& as) const noexcept;

};