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// 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_LINESTRING_CONCEPT_HPP
#define BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_LINESTRING_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 Linestring concept
\ingroup concepts
\par Formal definition:
The linestring concept is defined as following:
- there must be a specialization of traits::tag defining linestring_tag as type
- it must behave like a Boost.Range
- it must implement a std::back_insert_iterator
- either by implementing push_back
- or by specializing std::back_insert_iterator
\note to fulfill the concepts, no traits class has to be specialized to
define the point type.
\par Example:
A custom linestring, defining the necessary specializations to fulfill to the concept.
Suppose that the following linestring is defined:
\dontinclude doxygen_5.cpp
\skip custom_linestring1
\until };
It can then be adapted to the concept as following:
\dontinclude doxygen_5.cpp
\skip adapt custom_linestring1
\until }}
\note
- There is also the registration macro BOOST_GEOMETRY_REGISTER_LINESTRING
- For registration of std::vector<P> (and deque, and list) it is enough to
include the header-file geometries/adapted/std_as_linestring.hpp. That registers
a vector as a linestring (so it cannot be registered as a linear ring then,
in the same source code).
*/
template <typename Geometry>
class Linestring
{
#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(Linestring)
{
Geometry* ls = 0;
traits::clear<Geometry>::apply(*ls);
traits::resize<Geometry>::apply(*ls, 0);
point_type* point = 0;
traits::push_back<Geometry>::apply(*ls, *point);
}
#endif
};
/*!
\brief Linestring concept (const version)
\ingroup const_concepts
\details The ConstLinestring concept check the same as the Linestring concept,
but does not check write access.
*/
template <typename Geometry>
class ConstLinestring
{
#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>) );
// Relaxed the concept.
BOOST_CONCEPT_ASSERT( (boost::ForwardRangeConcept<Geometry>) );
public :
BOOST_CONCEPT_USAGE(ConstLinestring)
{
}
#endif
};
template <typename Geometry>
struct concept_type<Geometry, linestring_tag>
{
using type = Linestring<Geometry>;
};
template <typename Geometry>
struct concept_type<Geometry const, linestring_tag>
{
using type = ConstLinestring<Geometry>;
};
}}} // namespace boost::geometry::concepts
#endif // BOOST_GEOMETRY_GEOMETRIES_CONCEPTS_LINESTRING_CONCEPT_HPP
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