COIN-OR::LEMON - Graph Library

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  • lemon/smart_graph.h

    r220 r238  
    466466
    467467    public:
    468       operator Edge() const { return edgeFromId(_id / 2); }
     468      operator Edge() const {
     469        return _id != -1 ? edgeFromId(_id / 2) : INVALID;
     470      }
    469471
    470472      Arc() {}
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