Gecode::Search::Seq::Path< Tracer > Class Template Reference

Depth-first path (stack of edges) supporting recomputation. More...

#include <path.hh>

List of all members.

Classes
class	Edge
	Search tree edge for recomputation More...
Public Types
typedef Tracer::ID	ID
	Node identity type.
Public Member Functions
	Path (unsigned int l)
	Initialize with no-good depth limit l.
unsigned int	ngdl (void) const
	Return no-good depth limit.
void	ngdl (unsigned int l)
	Set no-good depth limit to l.
const Choice *	push (Worker &stat, Space *s, Space *c, unsigned int nid)
	Push space c (a clone of s or NULL).
void	next (void)
	Generate path for next node.
Edge &	top (void) const
	Provide access to topmost edge.
bool	empty (void) const
	Test whether path is empty.
int	lc (void) const
	Return position on stack of last copy.
void	unwind (int l, Tracer &t)
	Unwind the stack up to position l (after failure).
void	commit (Space *s, int i) const
	Commit space s as described by stack entry at position i.
Space *	recompute (unsigned int &d, unsigned int a_d, Worker &s, Tracer &t)
	Recompute space according to path.
Space *	recompute (unsigned int &d, unsigned int a_d, Worker &s, const Space &best, int &mark, Tracer &t)
	Recompute space according to path.
int	entries (void) const
	Return number of entries on stack.
void	reset (void)
	Reset stack.
virtual void	post (Space &home) const
	Post no-goods.
Protected Attributes
Support::DynamicStack< Edge, Heap >	ds
	Stack to store edge information.
unsigned int	_ngdl
	Depth limit for no-good generation.

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Detailed Description

template<class Tracer>
class Gecode::Search::Seq::Path< Tracer >

Depth-first path (stack of edges) supporting recomputation.

Maintains the invariant that it contains the path of the space being currently explored. This is required to support recomputation, of course.

The path supports adaptive recomputation controlled by the value of a_d: only if the recomputation distance is at least this large, an additional clone is created.

Definition at line 60 of file path.hh.

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Member Typedef Documentation

template<class Tracer >

typedef Tracer::ID Gecode::Search::Seq::Path< Tracer >::ID

Node identity type.

Definition at line 64 of file path.hh.

---

Constructor & Destructor Documentation

template<class Tracer >

Gecode::Search::Seq::Path< Tracer >::Path

(

unsigned int

l

)

[inline]

Initialize with no-good depth limit l.

Definition at line 119 of file path.hpp.

---

Member Function Documentation

template<class Tracer >

unsigned int Gecode::Search::Seq::Path< Tracer >::ngdl

(

void

)

const [inline]

Return no-good depth limit.

Definition at line 124 of file path.hpp.

template<class Tracer >

void Gecode::Search::Seq::Path< Tracer >::ngdl

(

unsigned int

l

)

[inline]

Set no-good depth limit to l.

Definition at line 130 of file path.hpp.

template<class Tracer >

const Choice * Gecode::Search::Seq::Path< Tracer >::push	(	Worker &	stat,
		Space *	s,
		Space *	c,
		unsigned int	nid
	)			[inline]

Push space c (a clone of s or NULL).

Definition at line 136 of file path.hpp.

template<class Tracer >

void Gecode::Search::Seq::Path< Tracer >::next

(

void

)

[inline]

Generate path for next node.

Definition at line 149 of file path.hpp.

template<class Tracer >

Path< Tracer >::Edge & Gecode::Search::Seq::Path< Tracer >::top

(

void

)

const [inline]

Provide access to topmost edge.

Definition at line 161 of file path.hpp.

template<class Tracer >

bool Gecode::Search::Seq::Path< Tracer >::empty

(

void

)

const [inline]

Test whether path is empty.

Definition at line 168 of file path.hpp.

template<class Tracer >

int Gecode::Search::Seq::Path< Tracer >::lc

(

void

)

const [inline]

Return position on stack of last copy.

Definition at line 181 of file path.hpp.

template<class Tracer >

void Gecode::Search::Seq::Path< Tracer >::unwind	(	int	l,
		Tracer &	t
	)			[inline]

Unwind the stack up to position l (after failure).

Definition at line 196 of file path.hpp.

template<class Tracer >

void Gecode::Search::Seq::Path< Tracer >::commit	(	Space *	s,
		int	i
	)			const [inline]

Commit space s as described by stack entry at position i.

Definition at line 174 of file path.hpp.

template<class Tracer >

Space * Gecode::Search::Seq::Path< Tracer >::recompute	(	unsigned int &	d,
		unsigned int	a_d,
		Worker &	s,
		Tracer &	t
	)			[inline]

Recompute space according to path.

Definition at line 225 of file path.hpp.

template<class Tracer >

Space * Gecode::Search::Seq::Path< Tracer >::recompute	(	unsigned int &	d,
		unsigned int	a_d,
		Worker &	s,
		const Space &	best,
		int &	mark,
		Tracer &	t
	)			[inline]

Recompute space according to path.

Definition at line 291 of file path.hpp.

template<class Tracer >

int Gecode::Search::Seq::Path< Tracer >::entries

(

void

)

const [inline]

Return number of entries on stack.

Definition at line 190 of file path.hpp.

template<class Tracer >

void Gecode::Search::Seq::Path< Tracer >::reset

(

void

)

[inline]

Reset stack.

Definition at line 218 of file path.hpp.

template<class Tracer >

void Gecode::Search::Seq::Path< Tracer >::post

(

Space &

home

)

const [inline, virtual]

Post no-goods.

Reimplemented from Gecode::NoGoods.

Definition at line 385 of file path.hpp.

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Member Data Documentation

template<class Tracer >

Support::DynamicStack<Edge,Heap> Gecode::Search::Seq::Path< Tracer >::ds [protected]

Stack to store edge information.

Definition at line 111 of file path.hh.

template<class Tracer >

unsigned int Gecode::Search::Seq::Path< Tracer >::_ngdl [protected]

Depth limit for no-good generation.

Definition at line 113 of file path.hh.

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The documentation for this class was generated from the following files:

• gecode/search/seq/path.hh
• gecode/search/seq/path.hpp