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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- *//* * Main authors: * Christian Schulte <schulte@gecode.org> * * Copyright: * Christian Schulte, 2006 * * This file is part of Gecode, the generic constraint * development environment: * http://www.gecode.org * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * */
#ifndef GECODE_INT_CIRCUIT_HH#define GECODE_INT_CIRCUIT_HH
#include <gecode/int.hh>#include <gecode/int/distinct.hh>
/** * \namespace Gecode::Int::Circuit * \brief %Circuit propagators */
namespace Gecode { namespace Int { namespace Circuit {
/** * \brief Base-class for circuit propagator * * Provides routines for checking that the induced variable value graph * is strongly connected and for pruning short cycles. * */ template<class View, class Offset> class Base : public NaryPropagator<View,Int::PC_INT_DOM> { protected: using NaryPropagator<View,Int::PC_INT_DOM>::x; /// Remember where to start the next time the propagator runs int start; /// Array for performing value propagation for distinct ViewArray<View> y; /// Offset transformation Offset o; /// Constructor for cloning \a p Base(Space& home, Base& p); /// Constructor for posting Base(Home home, ViewArray<View>& x, Offset& o); /// Check whether the view value graph is strongly connected ExecStatus connected(Space& home); /// Ensure path property: prune edges that could give too small cycles ExecStatus path(Space& home); public: /// Delete propagator and return its size virtual size_t dispose(Space& home); };
/** * \brief "Value-consistent" circuit propagator * * Propagates value-consistent distinct, checks that * the induced variable value graph is stronlgy connected, and * prunes too short cycles. * * Requires \code #include <gecode/int/circuit.hh> \endcode * \ingroup FuncIntProp */ template<class View, class Offset> class Val : public Base<View,Offset> { protected: using Base<View,Offset>::x; using Base<View,Offset>::y; using Base<View,Offset>::connected; using Base<View,Offset>::path; using Base<View,Offset>::o; /// Constructor for cloning \a p Val(Space& home, Val& p); /// Constructor for posting Val(Home home, ViewArray<View>& x, Offset& o); public: /// Copy propagator during cloning virtual Actor* copy(Space& home); /// Cost function (returns high linear) virtual PropCost cost(const Space& home, const ModEventDelta& med) const; /// Perform propagation virtual ExecStatus propagate(Space& home, const ModEventDelta& med); /// Post propagator for circuit on \a x static ExecStatus post(Home home, ViewArray<View>& x, Offset& o); };
/** * \brief "Domain consistent" circuit propagator * * Propagates domain consistent distinct, checks that * the induced variable value graph is stronlgy connected, and * prunes too shot cycles. * * Requires \code #include <gecode/int/circuit.hh> \endcode * \ingroup FuncIntProp */ template<class View, class Offset> class Dom : public Base<View,Offset> { protected: using Base<View,Offset>::x; using Base<View,Offset>::y; using Base<View,Offset>::connected; using Base<View,Offset>::path; using Base<View,Offset>::o; /// Propagation controller for propagating distinct Int::Distinct::DomCtrl<View> dc; /// Constructor for cloning \a p Dom(Space& home, Dom& p); /// Constructor for posting Dom(Home home, ViewArray<View>& x, Offset& o); public: /// Copy propagator during cloning virtual Actor* copy(Space& home); /** * \brief Cost function * * If in stage for naive value propagation, the cost is * low linear. Otherwise it is high quadratic. */ virtual PropCost cost(const Space& home, const ModEventDelta& med) const; /// Schedule function virtual void reschedule(Space& home); /// Perform propagation virtual ExecStatus propagate(Space& home, const ModEventDelta& med); /// Post propagator for circuit on \a x static ExecStatus post(Home home, ViewArray<View>& x, Offset& o); };
}}}
#include <gecode/int/circuit/base.hpp>#include <gecode/int/circuit/val.hpp>#include <gecode/int/circuit/dom.hpp>
#endif
// STATISTICS: int-prop