Boost C++ Libraries

boost/geometry/geometries/concepts/segment_concept.hpp

// Boost.Geometry (aka GGL, Generic Geometry Library)

// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
// Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.

// This file was modified by Oracle on 2021.
// Modifications copyright (c) 2021 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle

// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.

// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP
#define BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP


#include <boost/concept_check.hpp>
#include <boost/core/ignore_unused.hpp>

#include <boost/geometry/core/access.hpp>
#include <boost/geometry/core/point_type.hpp>

#include <boost/geometry/geometries/concepts/concept_type.hpp>
#include <boost/geometry/geometries/concepts/point_concept.hpp>


namespace boost { namespace geometry { namespace concepts
{

template <typename Geometry>
class Segment
{
#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
    using point_type = point_type_t<Geometry>;

    BOOST_CONCEPT_ASSERT( (concepts::Point<point_type>) );


    template <size_t Index, size_t Dimension, size_t DimensionCount>
    struct dimension_checker
    {
        static void apply()
        {
            Geometry* s = 0;
            geometry::set<Index, Dimension>(*s, geometry::get<Index, Dimension>(*s));
            dimension_checker<Index, Dimension + 1, DimensionCount>::apply();
        }
    };

    template <size_t Index, size_t DimensionCount>
    struct dimension_checker<Index, DimensionCount, DimensionCount>
    {
        static void apply() {}
    };

public :

    BOOST_CONCEPT_USAGE(Segment)
    {
        static const size_t n = dimension<point_type>::type::value;
        dimension_checker<0, 0, n>::apply();
        dimension_checker<1, 0, n>::apply();
    }
#endif
};


/*!
\brief Segment concept (const version).
\ingroup const_concepts
\details The ConstSegment concept verifies the same as the Segment concept,
but does not verify write access.
*/
template <typename Geometry>
class ConstSegment
{
#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
    using point_type = point_type_t<Geometry>;
    using coordinate_type = coordinate_type_t<Geometry>;

    BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<point_type>) );


    template <size_t Index, size_t Dimension, size_t DimensionCount>
    struct dimension_checker
    {
        static void apply()
        {
            const Geometry* s = 0;
            coordinate_type coord(geometry::get<Index, Dimension>(*s));
            boost::ignore_unused(coord);
            dimension_checker<Index, Dimension + 1, DimensionCount>::apply();
        }
    };

    template <size_t Index, size_t DimensionCount>
    struct dimension_checker<Index, DimensionCount, DimensionCount>
    {
        static void apply() {}
    };

public :

    BOOST_CONCEPT_USAGE(ConstSegment)
    {
        static const size_t n = dimension<point_type>::type::value;
        dimension_checker<0, 0, n>::apply();
        dimension_checker<1, 0, n>::apply();
    }
#endif
};


template <typename Geometry>
struct concept_type<Geometry, segment_tag>
{
    using type = Segment<Geometry>;
};

template <typename Geometry>
struct concept_type<Geometry const, segment_tag>
{
    using type = ConstSegment<Geometry>;
};


}}} // namespace boost::geometry::concepts


#endif // BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP