Boost.Geometry unique

unique()は、重複した点を削除する関数です。

#include <iostream>
#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/linestring.hpp>
#include <boost/assign/list_of.hpp>

namespace bg = boost::geometry;

typedef bg::model::d2::point_xy<double> point;
typedef bg::model::linestring<point> linestring;

int main()
{
    linestring line = boost::assign::list_of<point>
        (0, 0)
        (1, 1)
        (1, 1)
        (3, 3)
        (1, 1)
        ;

    bg::unique(line);

    std::cout << bg::dsv(line) << std::endl;
}

((0, 0), (1, 1), (3, 3), (1, 1))

参照：
unique algorithm