Boost Graph Library:防止DFS访问未连接的节点
Boost Graph Library: Prevent DFS from visiting unconnected nodes
我有一个双向图。一些顶点未连接。我使用 boost::depth_first_search 遍历顶点。我还提供起始源节点。我看到未连接的顶点也在连接节点完成后处理。如何防止访问此类节点?事实上,如何让 DFS 只访问源节点可达的那些节点,而不访问其他任何节点?
我有以下代码:
/// 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;
}
您想使用 depth_first_visit
,而不是 depth_first_search
。
我有一个双向图。一些顶点未连接。我使用 boost::depth_first_search 遍历顶点。我还提供起始源节点。我看到未连接的顶点也在连接节点完成后处理。如何防止访问此类节点?事实上,如何让 DFS 只访问源节点可达的那些节点,而不访问其他任何节点?
我有以下代码:
/// 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;
}
您想使用 depth_first_visit
,而不是 depth_first_search
。