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135 lines
4.0 KiB
135 lines
4.0 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2008-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2009-2011 Mateusz Loskot, London, UK. |
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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/geometry/geometries/concepts/point_concept.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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namespace boost { namespace geometry { namespace concept |
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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( (concept::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( (concept::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_variable_warning(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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}}} // namespace boost::geometry::concept |
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#endif // BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_SEGMENT_CONCEPT_HPP
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