Gecode::Int::Rel::LexLqLe Class Reference

Lexical ordering propagator. More...

#include <rel.hh>

List of all members.

Public Member Functions
virtual Actor *	copy (Space &home, bool share)
	Copy propagator during cloning.
virtual PropCost	cost (const Space &home, const ModEventDelta &med) const
	Cost function (defined as low linear)
virtual ExecStatus	propagate (Space &home, const ModEventDelta &med)
	Perform propagation.
virtual size_t	dispose (Space &home)
	Delete propagator and return its size.
Static Public Member Functions
static ExecStatus	post (Home home, ViewArray< View > &x, ViewArray< View > &y, bool strict)
	Post propagator for lexical order between x and y.
Protected Member Functions
	LexLqLe (Space &home, bool share, LexLqLe< View > &p)
	Constructor for cloning p.
	LexLqLe (Home home, ViewArray< View > &x, ViewArray< View > &y, bool strict)
	Constructor for posting.
Protected Attributes
ViewArray< View >	x
	View arrays.
ViewArray< View >	y
bool	strict
	Determines whether propagator is strict or not.

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Detailed Description

Lexical ordering propagator.

The propagator uses the algorithm (and also the automaton) from: Mats Carlsson, Nicolas Beldiceanu, Revisiting the Lexicographic Ordering Constraint. SICS Technical Report T2002:17, SICS, Sweden, 2002.

It deviates in the following two main aspects:

• Assigned variables are eagerly eliminated This yields the same incremental behaviour with respect to states 1 and 2 of the automaton. With respect to the values of q and r in the report:
  • q is always 0 after elimination
  • r is always 1 after elimination

• It is not incremental with respect to states 3 and 4 as no propagation event information is available

Requires

 #include <gecode/int/rel.hh> 

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Constructor & Destructor Documentation

Gecode::Int::Rel::LexLqLe::LexLqLe	(	Space &	home,
		bool	share,
		LexLqLe< View > &	p
	)		[inline, protected]

Constructor for cloning p.

Definition at line 54 of file lex.hpp.

Gecode::Int::Rel::LexLqLe::LexLqLe	(	Home	home,
		ViewArray< View > &	x,
		ViewArray< View > &	y,
		bool	strict
	)		[inline, protected]

Constructor for posting.

Definition at line 45 of file lex.hpp.

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Member Function Documentation

Actor * Gecode::Int::Rel::LexLqLe::copy	(	Space &	home,
		bool	share
	)		[virtual]

Copy propagator during cloning.

Implements Gecode::Actor.

Definition at line 62 of file lex.hpp.

PropCost Gecode::Int::Rel::LexLqLe::cost	(	const Space &	home,
		const ModEventDelta &	med
	)		const [virtual]

Cost function (defined as low linear)

Implements Gecode::Propagator.

Definition at line 68 of file lex.hpp.

ExecStatus Gecode::Int::Rel::LexLqLe::propagate	(	Space &	home,
		const ModEventDelta &	med
	)		[virtual]

Perform propagation.

Implements Gecode::Propagator.

Definition at line 84 of file lex.hpp.

ExecStatus Gecode::Int::Rel::LexLqLe::post	(	Home	home,
		ViewArray< View > &	x,
		ViewArray< View > &	y,
		bool	strict
	)		[static]

Post propagator for lexical order between x and y.

Definition at line 238 of file lex.hpp.

size_t Gecode::Int::Rel::LexLqLe::dispose

(

Space &

home

)

[inline, virtual]

Delete propagator and return its size.

Reimplemented from Gecode::Actor.

Definition at line 74 of file lex.hpp.

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Member Data Documentation

ViewArray<View> Gecode::Int::Rel::LexLqLe::x [protected]

View arrays.

Definition at line 600 of file rel.hh.

ViewArray<View> Gecode::Int::Rel::LexLqLe::y [protected]

Definition at line 600 of file rel.hh.

bool Gecode::Int::Rel::LexLqLe::strict [protected]

Determines whether propagator is strict or not.

Definition at line 602 of file rel.hh.

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

• gecode/int/rel.hh (Revision: 12151)
• gecode/int/rel/lex.hpp (Revision: 12163)