SplitNodes< DGR > Class Template Reference

Detailed Description

template<typename DGR>
class lemon::SplitNodes< DGR >

SplitNodes adaptor can be used for splitting each node into an in-node and an out-node in a digraph. Formaly, the adaptor replaces each node \( u \) in the digraph with two nodes, namely node \( u_{in} \) and node \( u_{out} \). If there is a \( (v, u) \) arc in the original digraph, then the new target of the arc will be \( u_{in} \) and similarly the source of each original \( (u, v) \) arc will be \( u_{out} \). The adaptor adds an additional bind arc from \( u_{in} \) to \( u_{out} \) for each node \( u \) of the original digraph.

The aim of this class is running an algorithm with respect to node costs or capacities if the algorithm considers only arc costs or capacities directly. In this case you can use SplitNodes adaptor, and set the node costs/capacities of the original digraph to the bind arcs in the adaptor.

This class provides item counting in the same time as the adapted digraph structure.

Template Parameters

DGR	The type of the adapted digraph. It must conform to the Digraph concept. It is implicitly const.

Note

The Node type of this adaptor is converible to the Node type of the adapted digraph.

#include <lemon/adaptors.h>

Classes
class	CombinedArcMap
	Arc map combined from an arc map and a node map of the original digraph. More...
class	CombinedNodeMap
	Node map combined from two original node maps. More...

Public Member Functions
	SplitNodes (const DGR &g)
	Constructor.

Static Public Member Functions
static bool	inNode (const Node &n)
static bool	outNode (const Node &n)
static bool	origArc (const Arc &a)
	Returns true if the given arc is an original arc.
static bool	bindArc (const Arc &a)
	Returns true if the given arc is a bind arc.
static Node	inNode (const DigraphNode &n)
static Node	outNode (const DigraphNode &n)
static Arc	arc (const DigraphNode &n)
	Returns the bind arc that corresponds to the given original node.
static Arc	arc (const DigraphArc &a)
	Returns the arc that corresponds to the given original arc.
template<typename IN , typename OUT >
static CombinedNodeMap< IN, OUT >	combinedNodeMap (IN &in_map, OUT &out_map)
	Returns a combined node map.
template<typename ArcMap , typename NodeMap >
static CombinedArcMap< ArcMap, NodeMap >	combinedArcMap (ArcMap &arc_map, NodeMap &node_map)
	Returns a combined arc map.

Related Functions
(Note that these are not member functions.)
template<typename DGR >
SplitNodes< DGR >	splitNodes (const DGR &digraph)
	Returns a (read-only) SplitNodes adaptor.

Constructor & Destructor Documentation

SplitNodes ( const DGR &  g )

inline

Constructor of the adaptor.

Member Function Documentation

static bool inNode ( const Node &  n )

inlinestatic

Returns true if the given node is an in-node.

static bool outNode ( const Node &  n )

inlinestatic

Returns true if the given node is an out-node.

static bool origArc ( const Arc &  a )

inlinestatic

Returns true if the given arc is one of the arcs in the original digraph.

static bool bindArc ( const Arc &  a )

inlinestatic

Returns true if the given arc is a bind arc, i.e. it connects an in-node and an out-node.

static Node inNode ( const DigraphNode &  n )

inlinestatic

Returns the in-node created from the given original node.

static Node outNode ( const DigraphNode &  n )

inlinestatic

Returns the out-node created from the given original node.

static Arc arc ( const DigraphNode &  n )

inlinestatic

Returns the bind arc in the adaptor that corresponds to the given original node, i.e. the arc connecting the in-node and out-node of n.

static Arc arc ( const DigraphArc &  a )

inlinestatic

Returns the arc in the adaptor that corresponds to the given original arc.

static CombinedNodeMap<IN, OUT> combinedNodeMap ( IN &  in_map, OUT &  out_map  )

inlinestatic

This function just returns a combined node map.

static CombinedArcMap<ArcMap, NodeMap> combinedArcMap ( ArcMap &  arc_map, NodeMap &  node_map  )

inlinestatic

This function just returns a combined arc map.