我有一个双向图，其中一些顶点未连接。我使用 boost::depth_first_search 遍历这些顶点，并提供起始源节点。我发现在处理完已连接的节点后，也会处理未连接的节点。如何避免访问这些节点？事实上，如何告诉 DFS 只访问从源节点可达的节点，而不访问其他任何节点？
以下是我的代码:
以下是我的代码:
/// Define vertex properties.
struct NodeProperty
{
unsigned id; /// Id.
unsigned kind; /// Kind.
unsigned depth; /// Depth.
unsigned layer_color; /// Layer color.
unsigned signal_color; /// Signal color.
unsigned sch_color; /// Sch color.
CBoundingBox bounds; /// Bounds of polygon.
NodeProperty()
: id(0), kind(0), depth(0), layer_color(0), signal_color(0), sch_color(0), bounds(0,0,0,0)
{
;
}
};
/// Define net topology graph.
typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, NodeProperty> Graph;
class receiver_visitor : public boost::default_dfs_visitor
{
public:
receiver_visitor(std::vector<Vertex>& r)
: res(r)
{
;
}
void discover_vertex(Vertex v, Graph const& g) const
{
std::cout << "Visit: " << v << std::endl;
if (g[v].sch_color) {
res.push_back(g[v].sch_color);
}
}
std::vector<Vertex>& res;
};
std::vector<std::size_t>
NetTopology::getReceivers(std::size_t src) const
{
std::vector<Vertex> r;
receiver_visitor vis(r);
boost::depth_first_search(data_->g, boost::visitor(vis).root_vertex(src));
return r;
}