alpar@202: /*!
alpar@202: 
alpar@202: \page maps How to write maps
alpar@202: 
alpar@202: \section read-maps Readable Maps
alpar@202: 
alpar@202: It is quite easy to write your own readmap for the edges or nodes of a graph.
alpar@202: 
alpar@202: You can find some example below.
alpar@202: 
alpar@204: This simple map assigns \f$\pi\f$ to each edge.
alpar@204: 
alpar@202: \code
alpar@202: class MyMap 
alpar@202: {
alpar@205:   double get(Graph::EdgeIt e) const { return M_PI;}
alpar@202: };
alpar@202: \endcode
alpar@202: 
alpar@204: Or if we accept the new map style, it will look like this:
alpar@204: 
alpar@204: \code
alpar@204: class MyMap 
alpar@204: {
alpar@205:   double operator[](Graph::EdgeIt e) const { return 1;}
alpar@204: };
alpar@204: \endcode
alpar@204: 
alpar@204: 
alpar@202: A more complex example
alpar@202: 
alpar@202: \code
alpar@202: class MyLengthMap 
alpar@202: {
alpar@202:   const Graph::EdgeMap &ol;
alpar@202:   const Graph::NodeMap &pot;
alpar@202:   
alpar@202:   double get(Graph::EdgeIt e) const { return ol.get(e)-pot.get(v)-pot.get(u);}
alpar@202:   
alpar@202:   MyComplexMap(const Graph::EdgeMap &o,const Graph::NodeMap &p) :
alpar@202:     ol(o), pot(p);
alpar@202: };
alpar@202: \endcode
alpar@202: 
alpar@202: */