Path< GR > Class Template Reference

Detailed Description

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

A structure for representing directed path in a digraph.

Template Parameters

GR	The digraph type in which the path is.

In a sense, the path can be treated as a list of arcs. The lemon path type stores just this list. As a consequence, it cannot enumerate the nodes of the path and the source node of a zero length path is undefined.

This implementation is a back and front insertable and erasable path type. It can be indexed in O(1) time. The front and back insertion and erase is done in O(1) (amortized) time. The implementation uses two vectors for storing the front and back insertions.

#include <lemon/path.h>

Classes
class	ArcIt
	LEMON style iterator for path arcs. More...

Public Member Functions
	Path ()
	Default constructor.
	Path (const Path &cpath)
	Copy constructor.
template<typename CPath >
	Path (const CPath &cpath)
	Template copy constructor.
Path &	operator= (const Path &cpath)
	Copy assignment.
template<typename CPath >
Path &	operator= (const CPath &cpath)
	Template copy assignment.
int	length () const
	Length of the path.
bool	empty () const
	Return whether the path is empty.
void	clear ()
	Reset the path to an empty one.
const Arc &	nth (int n) const
	The nth arc.
ArcIt	nthIt (int n) const
	Initialize arc iterator to point to the nth arc.
const Arc &	front () const
	The first arc of the path.
void	addFront (const Arc &arc)
	Add a new arc before the current path.
void	eraseFront ()
	Erase the first arc of the path.
const Arc &	back () const
	The last arc of the path.
void	addBack (const Arc &arc)
	Add a new arc behind the current path.
void	eraseBack ()
	Erase the last arc of the path.

Constructor & Destructor Documentation

Path ( )

inline

Default constructor

Path ( const CPath< GR > &  cpath )

inline

This constuctor initializes the path from any other path type. It simply makes a copy of the given path.

Member Function Documentation

Path& operator= ( const CPath< GR > &  cpath )

inline

This operator makes a copy of a path of any other type.

const Arc& nth ( int  n ) const

inline

Precondition

n is in the [0..length() - 1] range.

ArcIt nthIt ( int  n ) const

inline

Precondition

n is in the [0..length() - 1] range.