148 lines
4.0 KiB
C++
148 lines
4.0 KiB
C++
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Christian Schulte <schulte@gecode.org>
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*
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* Copyright:
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* Christian Schulte, 2011
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <gecode/int/bool.hh>
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namespace Gecode { namespace Int { namespace NValues {
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template<class VY>
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forceinline
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LqBool<VY>::LqBool(Home home, int status, ViewArray<BoolView>& x, VY y)
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: BoolBase<VY>(home,status,x,y) {}
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template<class VY>
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forceinline
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LqBool<VY>::LqBool(Space& home, LqBool<VY>& p)
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: BoolBase<VY>(home,p) {}
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template<class VY>
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Actor*
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LqBool<VY>::copy(Space& home) {
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return new (home) LqBool<VY>(home,*this);
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}
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template<class VY>
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inline ExecStatus
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LqBool<VY>::post(Home home, ViewArray<BoolView>& x, VY y) {
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if (x.size() == 0) {
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GECODE_ME_CHECK(y.gq(home,0));
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return ES_OK;
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}
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x.unique();
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GECODE_ME_CHECK(y.gq(home,1));
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if (x.size() == 1)
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return ES_OK;
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if (y.max() == 1) {
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assert(y.assigned());
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ViewArray<BoolView> xc(home,x);
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return Bool::NaryEq<BoolView>::post(home,xc);
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}
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if (y.min() >= 2)
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return ES_OK;
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int n = x.size();
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int status = 0;
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for (int i=n; i--; )
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if (x[i].zero()) {
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if (status & VS_ONE) {
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GECODE_ME_CHECK(y.gq(home,2));
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return ES_OK;
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}
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x[i] = x[--n];
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status |= VS_ZERO;
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} else if (x[i].one()) {
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if (status & VS_ZERO) {
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GECODE_ME_CHECK(y.gq(home,2));
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return ES_OK;
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}
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x[i] = x[--n];
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status |= VS_ONE;
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}
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assert(status != (VS_ZERO | VS_ONE));
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if (n == 0) {
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assert((status != 0) && (y.min() >= 1));
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return ES_OK;
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}
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x.size(n);
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(void) new (home) LqBool<VY>(home,status,x,y);
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return ES_OK;
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}
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template<class VY>
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ExecStatus
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LqBool<VY>::propagate(Space& home, const ModEventDelta&) {
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if (status == (VS_ZERO | VS_ONE)) {
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GECODE_ME_CHECK(y.gq(home,2));
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return home.ES_SUBSUMED(*this);
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}
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if (c.empty()) {
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assert((status != 0) && (y.min() >= 1));
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return home.ES_SUBSUMED(*this);
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}
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if (y.max() == 1) {
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if (status == VS_ZERO) {
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// Mark that everything is done
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status = VS_ZERO | VS_ONE;
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for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
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GECODE_ME_CHECK(as.advisor().view().zero(home));
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return home.ES_SUBSUMED(*this);
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}
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if (status == VS_ONE) {
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// Mark that everything is done
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status = VS_ZERO | VS_ONE;
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for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
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GECODE_ME_CHECK(as.advisor().view().one(home));
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return home.ES_SUBSUMED(*this);
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}
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}
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if (y.min() == 2)
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return home.ES_SUBSUMED(*this);
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return ES_FIX;
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}
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}}}
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// STATISTICS: int-prop
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