將圖表（adjacency_list）復制到另一個

Question

如何將adjacency_list類型的圖復制到adjacency_list類型的另一圖？

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

您嘗試過copy_graph嗎？

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很難知道問題出在哪里，而又看不到錯誤，但是如果我不得不猜測，我首先要確保您提供的是一個copy_graph的vertex_index映射，因為在將setS用於頂點存儲時默認情況下不可用。 根據您先前的問題 ，您似乎已經知道了這一點，因此我們只需要將它們整合在一起即可。

  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();