dijkstra.h File Reference

Detailed Description

Definitions for Disjkstra's shortest path algorithm.

Author

Thorsten Koch

Marc Pfetsch

Definition in file dijkstra.h.

Go to the source code of this file.

Data Structures
struct	DIJKSTRA_Graph

Macros
#define	DIJKSTRA_Bool   unsigned int
#define	TRUE   1
#define	FALSE   0
#define	DIJKSTRA_FARAWAY   0xffffffffu
#define	DIJKSTRA_UNUSED   0xffffffffu

Typedefs
typedef struct DIJKSTRA_Graph	DIJKSTRA_GRAPH

Functions
DIJKSTRA_Bool	dijkstraGraphIsValid (const DIJKSTRA_GRAPH *G)
unsigned int	dijkstra (const DIJKSTRA_GRAPH *G, unsigned int source, unsigned long long *dist, unsigned int *pred, unsigned int *entry, unsigned int *order)
unsigned int	dijkstraPair (const DIJKSTRA_GRAPH *G, unsigned int source, unsigned int target, unsigned long long *dist, unsigned int *pred, unsigned int *entry, unsigned int *order)
unsigned int	dijkstraPairCutoff (const DIJKSTRA_GRAPH *G, unsigned int source, unsigned int target, unsigned long long cutoff, unsigned long long *dist, unsigned int *pred, unsigned int *entry, unsigned int *order)
unsigned int	dijkstraPairCutoffIgnore (const DIJKSTRA_GRAPH *G, unsigned int source, unsigned int target, unsigned int *ignore, unsigned long long cutoff, unsigned long long *dist, unsigned int *pred, unsigned int *entry, unsigned int *order)

Macro Definition Documentation

DIJKSTRA_Bool

#define DIJKSTRA_Bool   unsigned int

type used for boolean values

Definition at line 40 of file dijkstra.h.

TRUE

#define TRUE   1

boolean value TRUE

Definition at line 43 of file dijkstra.h.

FALSE

#define FALSE   0

boolean value FALSE

Definition at line 44 of file dijkstra.h.

DIJKSTRA_FARAWAY

#define DIJKSTRA_FARAWAY   0xffffffffu

node has distance 'infinity'

Definition at line 47 of file dijkstra.h.

Referenced by dijkstra(), dijkstraPair(), dijkstraPairCutoff(), dijkstraPairCutoffIgnore(), and separateGLS().

DIJKSTRA_UNUSED

#define DIJKSTRA_UNUSED   0xffffffffu

node is unused

Definition at line 48 of file dijkstra.h.

Referenced by checkArraySizesGLS(), dijkstra(), dijkstraGraphIsValid(), dijkstraPair(), dijkstraPairCutoff(), dijkstraPairCutoffIgnore(), separateGLS(), and separateHeur().

Typedef Documentation

DIJKSTRA_GRAPH

typedef struct DIJKSTRA_Graph DIJKSTRA_GRAPH

graph structure - use consecutive storage for arcs

Definition at line 65 of file dijkstra.h.

Function Documentation

dijkstraGraphIsValid()

DIJKSTRA_Bool dijkstraGraphIsValid

(

const DIJKSTRA_GRAPH *

G

)

Check whether the data structures of the graph are valid.

Parameters

G	directed graph to be checked

Definition at line 42 of file dijkstra.c.

References DIJKSTRA_Graph::arcs, DIJKSTRA_UNUSED, DIJKSTRA_Graph::head, DIJKSTRA_Graph::maxweight, DIJKSTRA_Graph::minweight, DIJKSTRA_Graph::nodes, NULL, DIJKSTRA_Graph::outbeg, DIJKSTRA_Graph::outcnt, TRUE, and DIJKSTRA_Graph::weight.

Referenced by dijkstra(), dijkstraPair(), dijkstraPairCutoff(), dijkstraPairCutoffIgnore(), and separateGLS().

dijkstra()

unsigned int dijkstra	(	const DIJKSTRA_GRAPH *	G,
		unsigned int	source,
		unsigned long long *	dist,
		unsigned int *	pred,
		unsigned int *	entry,
		unsigned int *	order
	)

Dijkstra's algorithm using binary heaps

Dijkstra's algorithm for shortest paths from a single source using binary heaps

Parameters

G	directed graph
source	source node
dist	node distances (allocated by user)
pred	node predecessors in final shortest path tree (allocated by user)
entry	temporary storage (for each node - must be allocated by user)
order	temporary storage (for each node - must be allocated by user)

Definition at line 190 of file dijkstra.c.

References DIJKSTRA_FARAWAY, DIJKSTRA_UNUSED, dijkstraGraphIsValid(), dijkstraHeapIsValid(), dijkstraSiftDown(), dijkstraSiftUp(), DIJKSTRA_Graph::head, DIJKSTRA_Graph::nodes, NULL, DIJKSTRA_Graph::outbeg, BMS_BufMem::used, and DIJKSTRA_Graph::weight.

dijkstraPair()

unsigned int dijkstraPair	(	const DIJKSTRA_GRAPH *	G,
		unsigned int	source,
		unsigned int	target,
		unsigned long long *	dist,
		unsigned int *	pred,
		unsigned int *	entry,
		unsigned int *	order
	)

Dijkstra's algorithm for shortest paths between a pair of nodes using binary heaps

Parameters

G	directed graph
source	source node
target	target node
dist	node distances (allocated by user)
pred	node predecessors in final shortest path tree (allocated by user)
entry	temporary storage (for each node - must be allocated by user)
order	temporary storage (for each node - must be allocated by user)

Definition at line 290 of file dijkstra.c.

References DIJKSTRA_FARAWAY, DIJKSTRA_UNUSED, dijkstraGraphIsValid(), dijkstraHeapIsValid(), dijkstraSiftDown(), dijkstraSiftUp(), DIJKSTRA_Graph::head, DIJKSTRA_Graph::nodes, NULL, DIJKSTRA_Graph::outbeg, BMS_BufMem::used, and DIJKSTRA_Graph::weight.

dijkstraPairCutoff()

unsigned int dijkstraPairCutoff	(	const DIJKSTRA_GRAPH *	G,
		unsigned int	source,
		unsigned int	target,
		unsigned long long	cutoff,
		unsigned long long *	dist,
		unsigned int *	pred,
		unsigned int *	entry,
		unsigned int *	order
	)

Dijkstra's algorithm for shortest paths between a pair of nodes using binary heaps and truncated at cutoff

Parameters

G	directed graph
source	source node
target	target node
cutoff	if the distance of a node reached this value, we truncate the search
dist	node distances (allocated by user)
pred	node predecessors in final shortest path tree (allocated by user)
entry	temporary storage (for each node - must be allocated by user)
order	temporary storage (for each node - must be allocated by user)

Definition at line 396 of file dijkstra.c.

References DIJKSTRA_FARAWAY, DIJKSTRA_UNUSED, dijkstraGraphIsValid(), dijkstraHeapIsValid(), dijkstraSiftDown(), dijkstraSiftUp(), DIJKSTRA_Graph::head, DIJKSTRA_Graph::nodes, NULL, DIJKSTRA_Graph::outbeg, BMS_BufMem::used, and DIJKSTRA_Graph::weight.

Referenced by separateGLS().

dijkstraPairCutoffIgnore()

unsigned int dijkstraPairCutoffIgnore	(	const DIJKSTRA_GRAPH *	G,
		unsigned int	source,
		unsigned int	target,
		unsigned int *	ignore,
		unsigned long long	cutoff,
		unsigned long long *	dist,
		unsigned int *	pred,
		unsigned int *	entry,
		unsigned int *	order
	)

Dijkstra's algorithm for shortest paths between a pair of nodes ignoring nodes, using binary heaps, and truncated at cutoff

Parameters

G	directed graph
source	source node
target	target node
ignore	marking nodes to be ignored (if value is nonzero)
cutoff	if the distance of a node reached this value, we truncate the search
dist	node distances (allocated by user)
pred	node predecessors in final shortest path tree (allocated by user)
entry	temporary storage (for each node - must be allocated by user)
order	temporary storage (for each node - must be allocated by user)

Definition at line 507 of file dijkstra.c.

References DIJKSTRA_FARAWAY, DIJKSTRA_UNUSED, dijkstraGraphIsValid(), dijkstraHeapIsValid(), dijkstraSiftDown(), dijkstraSiftUp(), DIJKSTRA_Graph::head, DIJKSTRA_Graph::nodes, NULL, DIJKSTRA_Graph::outbeg, BMS_BufMem::used, and DIJKSTRA_Graph::weight.

Referenced by separateGLS().