unweightededge.h

《数据结构、算法与应用》从C++语言应用角度列举了要点

// edge in an unweighted graph

#ifndef unweightedEdge_
#define unweightedEdge_

#include "edge.h"
#include "myExceptions.h"

using namespace std;

class unweightedEdge : public edge<bool>
{
   public:
      unweightedEdge(int theV1, int theV2)
         {v1 = theV1; v2 = theV2;}
      ~unweightedEdge() {};
      int vertex1() const {return v1;}
      int vertex2() const {return v2;}
      bool weight() const {throw undefinedMethod("weight");}
   private:
      int v1,
          v2;
};
#endif