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99 lines
2.8 KiB
99 lines
2.8 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_RING_CONCEPT_HPP |
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#define BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_RING_CONCEPT_HPP |
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#include <boost/concept_check.hpp> |
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#include <boost/range/concepts.hpp> |
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#include <boost/type_traits/remove_const.hpp> |
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#include <boost/geometry/core/access.hpp> |
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#include <boost/geometry/core/mutable_range.hpp> |
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#include <boost/geometry/core/point_type.hpp> |
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#include <boost/geometry/geometries/concepts/point_concept.hpp> |
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namespace boost { namespace geometry { namespace concept |
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{ |
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/*! |
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\brief ring concept |
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\ingroup concepts |
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\par Formal definition: |
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The ring concept is defined as following: |
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- there must be a specialization of traits::tag defining ring_tag as type |
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- it must behave like a Boost.Range |
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- there can optionally be a specialization of traits::point_order defining the |
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order or orientation of its points, clockwise or counterclockwise. |
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- it must implement a std::back_insert_iterator |
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(This is the same as the for the concept Linestring, and described there) |
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\note to fulfill the concepts, no traits class has to be specialized to |
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define the point type. |
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*/ |
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template <typename Geometry> |
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class Ring |
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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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BOOST_CONCEPT_ASSERT( (boost::RandomAccessRangeConcept<Geometry>) ); |
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public : |
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BOOST_CONCEPT_USAGE(Ring) |
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{ |
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Geometry* ring = 0; |
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traits::clear<Geometry>::apply(*ring); |
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traits::resize<Geometry>::apply(*ring, 0); |
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point_type* point = 0; |
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traits::push_back<Geometry>::apply(*ring, *point); |
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} |
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#endif |
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}; |
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/*! |
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\brief (linear) ring concept (const version) |
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\ingroup const_concepts |
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\details The ConstLinearRing concept check the same as the Geometry concept, |
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but does not check write access. |
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*/ |
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template <typename Geometry> |
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class ConstRing |
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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::ConstPoint<point_type>) ); |
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BOOST_CONCEPT_ASSERT( (boost::RandomAccessRangeConcept<Geometry>) ); |
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public : |
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BOOST_CONCEPT_USAGE(ConstRing) |
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{ |
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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_RING_CONCEPT_HPP
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