Generated on Fri Oct 19 11:26:09 2018 for Gecode by doxygen 1.6.3

Gecode::Int::Distinct::Bnd< View > Class Template Reference
[Integer propagators]

Bounds consistent distinct propagator. More...

#include <distinct.hh>

List of all members.

Public Member Functions

virtual ExecStatus propagate (Space &home, const ModEventDelta &med)
 Perform propagation.
virtual PropCost cost (const Space &home, const ModEventDelta &med) const
 Cost function.
virtual void reschedule (Space &home)
 Schedule function.
virtual Actorcopy (Space &home)
 Copy propagator during cloning.
virtual size_t dispose (Space &home)
 Destructor.

Static Public Member Functions

static ExecStatus post (Home home, ViewArray< View > &x)
 Post propagator for view array x.

Protected Member Functions

 Bnd (Home home, ViewArray< View > &x)
 Constructor for posting.
 Bnd (Space &home, Bnd< View > &p)
 Constructor for cloning p.

Protected Attributes

ViewArray< View > x
 Views on which to perform bounds-propagation.
ViewArray< View > y
 Views on which to perform value-propagation (subset of x).
int min_x
 Minimum (approximation) of view in x.
int max_x
 Maximum (approximation) of view in x.

Detailed Description

template<class View>
class Gecode::Int::Distinct::Bnd< View >

Bounds consistent distinct propagator.

The propagator uses staging: first it uses naive value-based propagation and only then uses bounds consistent propagation. Due to using naive value-based propagation, the propagator might actually achieve stronger consistency than just bounds consistency.

The algorithm is taken from: A. Lopez-Ortiz, C.-G. Quimper, J. Tromp, and P. van Beek. A fast and simple algorithm for bounds consistency of the alldifferent constraint. IJCAI-2003.

This implementation uses the code that is provided by Peter Van Beek: http://ai.uwaterloo.ca/~vanbeek/software/software.html The code (originally by John Tromp) here has only been slightly modified to fit Gecode (taking idempotent/non-idempotent propagation into account) and uses a more efficient layout of datastructures (keeping the number of different arrays small).

Requires

Definition at line 152 of file distinct.hh.


Constructor & Destructor Documentation

template<class View >
Gecode::Int::Distinct::Bnd< View >::Bnd ( Home  home,
ViewArray< View > &  x 
) [inline, protected]

Constructor for posting.

Definition at line 38 of file bnd.hpp.

template<class View >
Gecode::Int::Distinct::Bnd< View >::Bnd ( Space home,
Bnd< View > &  p 
) [inline, protected]

Constructor for cloning p.

Definition at line 64 of file bnd.hpp.


Member Function Documentation

template<class View >
ExecStatus Gecode::Int::Distinct::Bnd< View >::post ( Home  home,
ViewArray< View > &  x 
) [inline, static]

Post propagator for view array x.

Definition at line 476 of file bnd.hpp.

template<class View >
ExecStatus Gecode::Int::Distinct::Bnd< View >::propagate ( Space home,
const ModEventDelta med 
) [inline, virtual]

Perform propagation.

Implements Gecode::Propagator.

Definition at line 381 of file bnd.hpp.

template<class View >
PropCost Gecode::Int::Distinct::Bnd< View >::cost ( const Space home,
const ModEventDelta med 
) const [inline, virtual]

Cost function.

If in stage for naive value propagation, the cost is low linear. Otherwise it is low quadratic.

Implements Gecode::Propagator.

Definition at line 78 of file bnd.hpp.

template<class View >
void Gecode::Int::Distinct::Bnd< View >::reschedule ( Space home  )  [inline, virtual]

Schedule function.

Implements Gecode::Propagator.

Definition at line 87 of file bnd.hpp.

template<class View >
Actor * Gecode::Int::Distinct::Bnd< View >::copy ( Space home  )  [inline, virtual]

Copy propagator during cloning.

Implements Gecode::Actor.

Definition at line 72 of file bnd.hpp.

template<class View >
size_t Gecode::Int::Distinct::Bnd< View >::dispose ( Space home  )  [inline, virtual]

Destructor.

Reimplemented from Gecode::Actor.

Definition at line 56 of file bnd.hpp.


Member Data Documentation

template<class View>
ViewArray<View> Gecode::Int::Distinct::Bnd< View >::x [protected]

Views on which to perform bounds-propagation.

Definition at line 155 of file distinct.hh.

template<class View>
ViewArray<View> Gecode::Int::Distinct::Bnd< View >::y [protected]

Views on which to perform value-propagation (subset of x).

Definition at line 157 of file distinct.hh.

template<class View>
int Gecode::Int::Distinct::Bnd< View >::min_x [protected]

Minimum (approximation) of view in x.

Definition at line 159 of file distinct.hh.

template<class View>
int Gecode::Int::Distinct::Bnd< View >::max_x [protected]

Maximum (approximation) of view in x.

Definition at line 161 of file distinct.hh.


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