DiEulerIt< GR > Class Template Reference

Detailed Description

template<typename GR>
class lemon::DiEulerIt< GR >

This iterator provides an Euler tour (Eulerian circuit) of a directed graph (if there exists) and it converts to the Arc type of the digraph.

For example, if the given digraph has an Euler tour (i.e it has only one non-trivial component and the in-degree is equal to the out-degree for all nodes), then the following code will put the arcs of g to the vector et according to an Euler tour of g.

std::vector<ListDigraph::Arc> et;
for(DiEulerIt<ListDigraph> e(g); e!=INVALID; ++e)
  et.push_back(e);

If g has no Euler tour, then the resulted walk will not be closed or not contain all arcs.

See Also

EulerIt

#include <lemon/euler.h>

Public Member Functions
	DiEulerIt (const GR &gr, typename GR::Node start=INVALID)
	Constructor.
	operator Arc ()
	Arc conversion.
bool	operator== (Invalid)
	Compare with INVALID.
bool	operator!= (Invalid)
	Compare with INVALID.
DiEulerIt &	operator++ ()
	Next arc of the tour.
Arc	operator++ (int)
	Postfix incrementation.

Constructor & Destructor Documentation

DiEulerIt ( const GR &  gr, typename GR::Node  start = INVALID  )

inline

Constructor.

Parameters

gr	A digraph.
start	The starting point of the tour. If it is not given, the tour will start from the first node that has an outgoing arc.

Member Function Documentation

DiEulerIt& operator++ ( )

inline

Next arc of the tour

Arc operator++ ( int  )

inline

Postfix incrementation.

Warning

This incrementation returns an Arc, not a DiEulerIt, as one may expect.