118 lines
3.2 KiB
C++
118 lines
3.2 KiB
C++
// 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 2020-2021.
|
|
// Modifications copyright (c) 2020-2021 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_RING_CONCEPT_HPP
|
|
#define BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_RING_CONCEPT_HPP
|
|
|
|
|
|
#include <boost/concept_check.hpp>
|
|
#include <boost/range/concepts.hpp>
|
|
|
|
#include <boost/geometry/core/access.hpp>
|
|
#include <boost/geometry/core/mutable_range.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
|
|
{
|
|
|
|
|
|
/*!
|
|
\brief ring concept
|
|
\ingroup concepts
|
|
\par Formal definition:
|
|
The ring concept is defined as following:
|
|
- there must be a specialization of traits::tag defining ring_tag as type
|
|
- it must behave like a Boost.Range
|
|
- there can optionally be a specialization of traits::point_order defining the
|
|
order or orientation of its points, clockwise or counterclockwise.
|
|
- it must implement a std::back_insert_iterator
|
|
(This is the same as the for the concept Linestring, and described there)
|
|
|
|
\note to fulfill the concepts, no traits class has to be specialized to
|
|
define the point type.
|
|
*/
|
|
template <typename Geometry>
|
|
class Ring
|
|
{
|
|
#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
|
|
typedef typename point_type<Geometry>::type point_type;
|
|
|
|
BOOST_CONCEPT_ASSERT( (concepts::Point<point_type>) );
|
|
BOOST_CONCEPT_ASSERT( (boost::RandomAccessRangeConcept<Geometry>) );
|
|
|
|
public :
|
|
|
|
BOOST_CONCEPT_USAGE(Ring)
|
|
{
|
|
Geometry* ring = 0;
|
|
traits::clear<Geometry>::apply(*ring);
|
|
traits::resize<Geometry>::apply(*ring, 0);
|
|
point_type* point = 0;
|
|
traits::push_back<Geometry>::apply(*ring, *point);
|
|
}
|
|
#endif
|
|
};
|
|
|
|
|
|
/*!
|
|
\brief (linear) ring concept (const version)
|
|
\ingroup const_concepts
|
|
\details The ConstLinearRing concept check the same as the Geometry concept,
|
|
but does not check write access.
|
|
*/
|
|
template <typename Geometry>
|
|
class ConstRing
|
|
{
|
|
#ifndef DOXYGEN_NO_CONCEPT_MEMBERS
|
|
typedef typename point_type<Geometry>::type point_type;
|
|
|
|
BOOST_CONCEPT_ASSERT( (concepts::ConstPoint<point_type>) );
|
|
BOOST_CONCEPT_ASSERT( (boost::RandomAccessRangeConcept<Geometry>) );
|
|
|
|
|
|
public :
|
|
|
|
BOOST_CONCEPT_USAGE(ConstRing)
|
|
{
|
|
}
|
|
#endif
|
|
};
|
|
|
|
|
|
template <typename Geometry>
|
|
struct concept_type<Geometry, ring_tag>
|
|
{
|
|
using type = Ring<Geometry>;
|
|
};
|
|
|
|
template <typename Geometry>
|
|
struct concept_type<Geometry const, ring_tag>
|
|
{
|
|
using type = ConstRing<Geometry>;
|
|
};
|
|
|
|
|
|
}}} // namespace boost::geometry::concepts
|
|
|
|
|
|
#endif // BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_RING_CONCEPT_HPP
|