edge.h

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/* This software is distributed under the GNU Lesser General Public License */
//==========================================================================
//
//   edge.h
//
//==========================================================================
// $Id: edge.h,v 1.15 2001/04/17 14:35:25 raitner Exp $

#ifndef GTL_EDGE_H
#define GTL_EDGE_H

#include <GTL/GTL.h>

#include <list>
#include <ostream>

__GTL_BEGIN_NAMESPACE
 
//--------------------------------------------------------------------------
//   For MSVC 5.0 edge.h has to be included before node.h and
//   {node,edge}_data.h. So we only declare needed classnames here
//--------------------------------------------------------------------------

class node;
class edge_data;

//--------------------------------------------------------------------------
//   edge
//--------------------------------------------------------------------------

class GTL_EXTERN edge
{
public:
    edge();

    node source() const;

    node target() const;

    void reverse ();

    void change_source (node n);

    void change_target (node n);

    const node& opposite(node n) const;

    list<node> sources() const;

    list<node> targets() const;

    int id() const;

    
    bool is_hidden () const;


    //================================================== Implementation
    
private:
    edge_data *data;
    
    void remove_from(int where) const; // 0 = sources, 1 == targets

    friend class graph;
    friend class node;
    
    GTL_EXTERN friend bool operator==(edge, edge);
    GTL_EXTERN friend bool operator!=(edge, edge);
    GTL_EXTERN friend bool operator<(edge, edge);
    GTL_EXTERN friend ostream& operator<< (ostream& os, const edge& e);
};

__GTL_END_NAMESPACE

#endif // GTL_EDGE_H

//--------------------------------------------------------------------------
//   end of file
//--------------------------------------------------------------------------