c++ - 将图 (adjacency_list) 复制到另一个图

Question

如何将 adjacency_list 类型的图复制到另一个 adjacency_list 类型的图？

typedef adjacency_list<setS, setS, undirectedS, NodeDataStruct, EdgeDataStruct> MyGraph;
MyGraph g1, g2;

// processing g1: adding vertices and edges ...
// processing g2: adding some vertices and edges ...

g1.clear();
g1 = g2 // this gives an execution error (exception)
g1 = MyGraph(g2); // this also gives an execution error
g2.clear();

Answer 1

你试过了吗copy_graph ？

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在没有看到错误的情况下很难知道问题出在哪里，但如果我不得不猜测，我会首先确保您提供了一个 vertex_index 映射到 copy_graph因为当您使用 setS 进行顶点存储时，默认情况下它不可用。根据您的earlier question ，看来您已经弄清楚了，所以我们只需要将它们整合在一起即可。

  typedef adjacency_list<setS, setS, undirectedS, NodeDataStruct, EdgeDataStruct> MyGraph;
  typedef MyGraph::vertex_descriptor NodeID;

  typedef map<NodeID, size_t> IndexMap;
  IndexMap mapIndex;
  associative_property_map<IndexMap> propmapIndex(mapIndex);

  MyGraph g1, g2;

  // processing g1: adding vertices and edges ...
  // processing g2: adding some vertices and edges ...

  int i=0;
  BGL_FORALL_VERTICES(v, g2, MyGraph)
  {
     put(propmapIndex, v, i++);
  }

  g1.clear();
  copy_graph( g2, g1, vertex_index_map( propmapIndex ) );
  g2.clear();