Gecode::Int::Distinct::Bnd< View > Class Template Reference
[Integer propagators]
#include <distinct.hh>
Inherits Gecode::Propagator.
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
#include "gecode/int/distinct.hh"
Definition at line 112 of file distinct.hh.
Public Member Functions | |
| virtual ExecStatus | propagate (Space *home) |
| Perform propagation. | |
| virtual PropCost | cost (void) const |
| Cost function. | |
| virtual Actor * | copy (Space *home, bool share) |
| Copy propagator during cloning. | |
| virtual size_t | dispose (Space *home) |
| Destructor. | |
Static Public Member Functions | |
| static ExecStatus | post (Space *home, ViewArray< View > &x) |
| Post propagator for view array x. | |
Protected Member Functions | |
| Bnd (Space *home, ViewArray< View > &x) | |
| Constructor for posting. | |
| Bnd (Space *home, bool share, 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). | |
Constructor & Destructor Documentation
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Constructor for posting.
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Constructor for cloning p.
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Member Function Documentation
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Post propagator for view array x.
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Perform propagation.
Implements Gecode::Propagator. |
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Cost function. If in stage for naive value propagation, the cost is dynamic PC_LINEAR_LO. Otherwise it is dynamic PC_LINEAR_HI. Implements Gecode::Propagator. |
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Copy propagator during cloning.
Implements Gecode::Actor. |
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Destructor.
Reimplemented from Gecode::Actor. |
Member Data Documentation
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Views on which to perform bounds-propagation.
Definition at line 115 of file distinct.hh. |
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Views on which to perform value-propagation (subset of
Definition at line 117 of file distinct.hh. |
The documentation for this class was generated from the following files:
- gecode/int/distinct.hh (Revision: 3768)
- gecode/int/distinct/bnd.icc (Revision: 3768)