155 lines
4.5 KiB
C++
155 lines
4.5 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2021.
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// Modifications copyright (c) 2021 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP
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#define BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP
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#include <boost/concept_check.hpp>
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#include <boost/core/ignore_unused.hpp>
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#include <boost/geometry/core/access.hpp>
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#include <boost/geometry/core/point_type.hpp>
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#include <boost/geometry/geometries/concepts/concept_type.hpp>
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#include <boost/geometry/geometries/concepts/point_concept.hpp>
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namespace boost { namespace geometry { namespace concepts
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{
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/*!
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\brief Segment concept.
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\ingroup concepts
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\details Formal definition:
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The segment concept is defined as following:
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- there must be a specialization of traits::tag defining segment_tag as type
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- there must be a specialization of traits::point_type to define the
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underlying point type (even if it does not consist of points, it should define
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this type, to indicate the points it can work with)
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- there must be a specialization of traits::indexed_access, per index
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and per dimension, with two functions:
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- get to get a coordinate value
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- set to set a coordinate value (this one is not checked for ConstSegment)
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\note The segment concept is similar to the box concept, defining another tag.
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However, the box concept assumes the index as min_corner, max_corner, while
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for the segment concept there is no assumption.
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*/
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template <typename Geometry>
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class Segment
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{
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#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
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typedef typename point_type<Geometry>::type point_type;
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BOOST_CONCEPT_ASSERT( (concepts::Point<point_type>) );
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template <size_t Index, size_t Dimension, size_t DimensionCount>
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struct dimension_checker
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{
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static void apply()
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{
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Geometry* s = 0;
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geometry::set<Index, Dimension>(*s, geometry::get<Index, Dimension>(*s));
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dimension_checker<Index, Dimension + 1, DimensionCount>::apply();
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}
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};
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template <size_t Index, size_t DimensionCount>
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struct dimension_checker<Index, DimensionCount, DimensionCount>
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{
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static void apply() {}
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};
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public :
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BOOST_CONCEPT_USAGE(Segment)
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{
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static const size_t n = dimension<point_type>::type::value;
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dimension_checker<0, 0, n>::apply();
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dimension_checker<1, 0, n>::apply();
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}
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#endif
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};
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/*!
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\brief Segment concept (const version).
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\ingroup const_concepts
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\details The ConstSegment concept verifies the same as the Segment concept,
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but does not verify write access.
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*/
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template <typename Geometry>
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class ConstSegment
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{
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#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
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typedef typename point_type<Geometry>::type point_type;
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typedef typename coordinate_type<Geometry>::type coordinate_type;
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BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<point_type>) );
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template <size_t Index, size_t Dimension, size_t DimensionCount>
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struct dimension_checker
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{
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static void apply()
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{
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const Geometry* s = 0;
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coordinate_type coord(geometry::get<Index, Dimension>(*s));
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boost::ignore_unused(coord);
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dimension_checker<Index, Dimension + 1, DimensionCount>::apply();
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}
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};
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template <size_t Index, size_t DimensionCount>
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struct dimension_checker<Index, DimensionCount, DimensionCount>
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{
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static void apply() {}
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};
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public :
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BOOST_CONCEPT_USAGE(ConstSegment)
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{
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static const size_t n = dimension<point_type>::type::value;
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dimension_checker<0, 0, n>::apply();
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dimension_checker<1, 0, n>::apply();
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}
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#endif
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};
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template <typename Geometry>
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struct concept_type<Geometry, segment_tag>
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{
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using type = Segment<Geometry>;
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};
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template <typename Geometry>
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struct concept_type<Geometry const, segment_tag>
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{
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using type = ConstSegment<Geometry>;
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};
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}}} // namespace boost::geometry::concepts
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#endif // BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP
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