Method ContourLine

source/matplot/util/contourc.cpp:176–177

    }

    ContourLine::ContourLine(bool is_hole)
        : std::vector<XY>(), _is_hole(is_hole), _parent(0) {}

    void ContourLine::add_child(ContourLine *child) {
        assert(!_is_hole && "Cannot add_child to a hole");