...one of the most highly
regarded and expertly designed C++ library projects in the
world.

— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards

Boost.Range strided range adaptor is adapted to Boost.Geometry

Boost.Range strided range adaptor makes a strided range (usually begin a linestring or ring) such that traversal is performed in steps of n.

The Boost.Range strided range adaptor takes over the model of the original geometry, which might be:

- a linestring
- a ring
- a multi_point
- a multi_linestring
- a multi_polygon

`#include <boost/geometry/geometries/adapted/boost_range/strided.hpp>`

The standard header `boost/geometry.hpp`

does not include this header.

Shows how to use a Boost.Geometry ring, strided by Boost.Range adaptor

#include <iostream> #include <boost/assign.hpp> #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/ring.hpp> #include <boost/geometry/geometries/adapted/boost_range/strided.hpp> int main() { using namespace boost::assign; using boost::adaptors::strided; typedef boost::geometry::model::d2::point_xy<int> xy; boost::geometry::model::ring<xy> ring; ring += xy(0, 0); ring += xy(0, 1); ring += xy(0, 2); ring += xy(1, 2); ring += xy(2, 2); ring += xy(2, 0); boost::geometry::correct(ring); std::cout << "Normal : " << boost::geometry::dsv(ring) << std::endl << "Strided: " << boost::geometry::dsv(ring | strided(2)) << std::endl; return 0; }

Output:

Normal : ((0, 0), (0, 1), (0, 2), (1, 2), (2, 2), (2, 0), (0, 0)) Strided: ((0, 0), (0, 2), (2, 2), (0, 0))