// 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 2020.
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// Modifications copyright (c) 2020 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_LINESTRING_CONCEPT_HPP
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#define BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_LINESTRING_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/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 concepts
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{
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/*!
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\brief Linestring concept
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\ingroup concepts
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\par Formal definition:
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The linestring concept is defined as following:
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- there must be a specialization of traits::tag defining linestring_tag as type
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- it must behave like a Boost.Range
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- it must implement a std::back_insert_iterator
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- either by implementing push_back
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- or by specializing std::back_insert_iterator
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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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\par Example:
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A custom linestring, defining the necessary specializations to fulfill to the concept.
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Suppose that the following linestring is defined:
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\dontinclude doxygen_5.cpp
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\skip custom_linestring1
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\until };
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It can then be adapted to the concept as following:
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\dontinclude doxygen_5.cpp
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\skip adapt custom_linestring1
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\until }}
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\note
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- There is also the registration macro BOOST_GEOMETRY_REGISTER_LINESTRING
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- For registration of std::vector<P> (and deque, and list) it is enough to
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include the header-file geometries/adapted/std_as_linestring.hpp. That registers
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a vector as a linestring (so it cannot be registered as a linear ring then,
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in the same source code).
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*/
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template <typename Geometry>
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class Linestring
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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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BOOST_CONCEPT_ASSERT( (boost::RandomAccessRangeConcept<Geometry>) );
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public :
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BOOST_CONCEPT_USAGE(Linestring)
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{
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Geometry* ls = 0;
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traits::clear<Geometry>::apply(*ls);
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traits::resize<Geometry>::apply(*ls, 0);
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point_type* point = 0;
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traits::push_back<Geometry>::apply(*ls, *point);
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}
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#endif
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};
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/*!
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\brief Linestring concept (const version)
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\ingroup const_concepts
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\details The ConstLinestring concept check the same as the Linestring 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 ConstLinestring
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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::ConstPoint<point_type>) );
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//BOOST_CONCEPT_ASSERT( (boost::RandomAccessRangeConcept<Geometry>) );
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// Relaxed the concept.
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BOOST_CONCEPT_ASSERT( (boost::ForwardRangeConcept<Geometry>) );
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public :
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BOOST_CONCEPT_USAGE(ConstLinestring)
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{
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}
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#endif
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};
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}}} // namespace boost::geometry::concepts
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#endif // BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_LINESTRING_CONCEPT_HPP
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