Macro to register a linestring.

Description

The macro BOOST_GEOMETRY_REGISTER_LINESTRING registers a linestring such that it is recognized by Boost.Geometry and that Boost.Geometry functionality can be used with the specified type. The linestring may contain template parameters, which must be specified then.

Synopsis

#define BOOST_GEOMETRY_REGISTER_LINESTRING(Linestring)

Parameters

Header

#include <boost/geometry/geometries/register/linestring.hpp>

Example

Show the use of BOOST_GEOMETRY_REGISTER_LINESTRING

#include <iostream>

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/register/linestring.hpp>

using point_2d = boost::geometry::model::d2::point_xy<double>;

BOOST_GEOMETRY_REGISTER_LINESTRING(std::vector<point_2d>)

int main()
{
    // Normal usage of std::
    std::vector<point_2d> line;
    line.push_back(point_2d(1, 1));
    line.push_back(point_2d(2, 2));
    line.push_back(point_2d(3, 1));

    // Usage of Boost.Geometry's length and wkt functions
    std::cout << "Length: "
        << boost::geometry::length(line)
        << std::endl;

    std::cout << "WKT: "
        << boost::geometry::wkt(line)
        << std::endl;

    return 0;
}

Output:

Length: 2.82843
WKT: LINESTRING(1 1,2 2,3 1)