edge.h

/// File: edge.h
/// This  class  encapsulates  pointers  to  the  source  and  destination  Vertex  objects  and  the
/// weight  of the  Edge. An alternative  would be to encapsulate  Vertex  identifiers  (ints)
/// rather than pointers to Vertex.

#ifndef EDGE_H
#define EDGE_H
#include <iostream>
#include "vertex.h"

using namespace std;

class Edge {
public:

    /// No argument constructor.
    Edge();

    /// Constructor  which  sets  the  source  vertex, the  destination  vertex  and  the  weight for this Edge.
    Edge(Vertex*, Vertex*, double);

    /// Returns a pointer to the source vertex.
    Vertex* getSource();

    /// Returns  a  pointer  to  the  destination vertex
    Vertex* getDestination();

    /// Returns the weight of this Edge.
    double getWeight();

    /// Function  operator  provides  an  ordering  for edges. Returns true if the weight of the first
    /// parameter  is  greater  than  that  of  the  second paramter.
    bool operator()(Edge*, Edge*);

    /// Returns a string representation of this  Edge. Useful for debugging purposes.
    friend ostream& operator<<(ostream&, Edge&);


private:
    Vertex* source;
    Vertex* destination;
    double weight;
};

#endif // EDGE_H