BGL を使用してフィルター処理されたグラフの連結成分を計算するにはどうすればよいですか? 「生きている」と呼ばれるカスタム頂点プロパティをチェックし、「生きている」頂点のみを返しますがconnected_components
、filtered_graph
. フィルター処理されたグラフに連続していない頂点 ID があるため、定義されていた が定義されていないという事実と関係があると思いますが、そのoperator[]
理由やその周りにコーディングする方法がわかりません。
typedef boost::adjacency_list<boost::hash_mapS, boost::vecS, boost::undirectedS, VertexProperties> Graph;
typedef boost::property_map<Graph, ::vertex_alive_t>::type AliveMap;
template <typename AliveMap>
struct vertex_is_alive {
vertex_is_alive() { }
vertex_is_alive(AliveMap alive) : m_alive(alive) { }
template <typename Vertex>
bool operator()(const Vertex& v) const {
return boost::get(m_alive,v) == STILL_ALIVE_CODE;
}
AliveMap m_alive;
};
Graph G;
//generate G...
int N = boost::num_vertices(G);
vector<int> component(N);
int num = boost::connected_components(G, &component[0]);
//do something with component and play around with vertex_alive statuses...this part works fine.
vertex_is_alive<AliveMap> filter(boost::get(::vertex_alive_t(), G));
boost::filtered_graph<Graph, vertex_is_alive<AliveMap> > fG (G, filter);
int num = boost::connected_components(fG, &component[0]);
//this makes it choke
私が受け取るエラーメッセージは次のとおりです(系図を削除しています):
/usr/local/include/boost/property_map/property_map.hpp:354:56: error: no match for ‘operator[]’ in ‘((const boost::vec_adj_list_vertex_property_map<boost::adjacency_list<boost::hash_mapS, boost::vecS, boost::undirectedS, boost::property<vertex_alive_t, unsigned int> >, boost::adjacency_list<boost::hash_mapS, boost::vecS, boost::undirectedS, boost::property<vertex_alive_t, unsigned int> >*, unsigned int, unsigned int&, vertex_alive_t>&)pa)[k]’
/usr/local/include/boost/property_map/property_map.hpp:354:56: note: candidate is:
In file included from /usr/local/include/boost/graph/adjacency_list.hpp:245:0,
from main.cpp:1:
/usr/local/include/boost/graph/detail/adjacency_list.hpp:2465:24: note: Reference boost::vec_adj_list_vertex_property_map<Graph, GraphPtr, ValueType, Reference, Tag>::operator[](boost::vec_adj_list_vertex_property_map<Graph, GraphPtr, ValueType, Reference, Tag>::key_type) const [with Graph = boost::adjacency_list<boost::hash_mapS, boost::vecS, boost::undirectedS, boost::property<vertex_alive_t, unsigned int> >; GraphPtr = boost::adjacency_list<boost::hash_mapS, boost::vecS, boost::undirectedS, boost::property<vertex_alive_t, unsigned int> >*; ValueType = unsigned int; Reference = unsigned int&; Tag = vertex_alive_t; boost::vec_adj_list_vertex_property_map<Graph, GraphPtr, ValueType, Reference, Tag>::key_type = unsigned int]
/usr/local/include/boost/graph/detail/adjacency_list.hpp:2465:24: note: no known conversion for argument 1 from ‘const boost::detail::edge_desc_impl<boost::undirected_tag, unsigned int>’ to ‘boost::vec_adj_list_vertex_property_map<boost::adjacency_list<boost::hash_mapS, boost::vecS, boost::undirectedS, boost::property<vertex_alive_t, unsigned int> >, boost::adjacency_list<boost::hash_mapS, boost::vecS, boost::undirectedS, boost::property<vertex_alive_t, unsigned int> >*, unsigned int, unsigned int&, vertex_alive_t>::key_type {aka unsigned int}’