Detailed Description

Class to make a snapshot of the digraph and restore it later.

The newly added nodes and arcs can be removed using the restore() function.

Warning:: Arc and node deletions and other modifications (e.g. contracting, splitting, reversing arcs or nodes) cannot be restored. These events invalidate the snapshot.

#include <lemon/list_graph.h>

Public Member Functions
	Snapshot ()
	Default constructor.
	Snapshot (ListDigraph &_digraph)
	Constructor that immediately makes a snapshot.
void	save (ListDigraph &_digraph)
	Make a snapshot.
void	restore ()
	Undo the changes until the last snapshot.
bool	valid () const

Constructor & Destructor Documentation

Snapshot ( ) [inline]

Default constructor. To actually make a snapshot you must call save().

Snapshot ( ListDigraph & _digraph ) [inline]

This constructor immediately makes a snapshot of the digraph.

Parameters:

_digraph The digraph we make a snapshot of.

void save ( ListDigraph & _digraph ) [inline]

Make a snapshot of the digraph.

This function can be called more than once. In case of a repeated call, the previous snapshot gets lost.

Parameters:

_digraph The digraph we make the snapshot of.

void restore ( ) [inline]

Undo the changes until the last snapshot created by save().

bool valid ( ) const [inline]

Gives back true when the snapshot is valid.