164 lines
4.4 KiB
C++
164 lines
4.4 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/rel.hh>
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#include <gecode/int/distinct.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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EqInt<VY>::EqInt(Home home, ValSet& vs, ViewArray<IntView>& x, VY y)
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: IntBase<VY>(home,vs,x,y) {
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home.notice(*this, AP_WEAKLY);
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}
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template<class VY>
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inline ExecStatus
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EqInt<VY>::post(Home home, ViewArray<IntView>& x, VY y) {
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if (x.size() == 0) {
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GECODE_ME_CHECK(y.eq(home,0));
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return ES_OK;
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}
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x.unique();
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if (x.size() == 1) {
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GECODE_ME_CHECK(y.eq(home,1));
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return ES_OK;
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}
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GECODE_ME_CHECK(y.gq(home,1));
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GECODE_ME_CHECK(y.lq(home,x.size()));
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if (y.max() == 1) {
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assert(y.assigned());
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return Rel::NaryEqDom<IntView>::post(home,x);
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}
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if (y.min() == x.size()) {
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assert(y.assigned());
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return Distinct::Dom<IntView>::post(home,x);
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}
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// Eliminate assigned views and store them into the value set
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ValSet vs;
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int n = x.size();
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for (int i=n; i--; )
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if (x[i].assigned()) {
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vs.add(home, x[i].val());
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x[i] = x[--n];
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}
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GECODE_ME_CHECK(y.gq(home,vs.size()));
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GECODE_ME_CHECK(y.lq(home,n + vs.size()));
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if (n == 0) {
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assert(y.val() == vs.size());
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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) EqInt<VY>(home, vs, x, y);
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return ES_OK;
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}
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template<class VY>
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forceinline
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EqInt<VY>::EqInt(Space& home, EqInt<VY>& p)
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: IntBase<VY>(home, p) {}
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template<class VY>
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Propagator*
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EqInt<VY>::copy(Space& home) {
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return new (home) EqInt<VY>(home, *this);
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}
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template<class VY>
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forceinline size_t
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EqInt<VY>::dispose(Space& home) {
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home.ignore(*this, AP_WEAKLY);
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(void) IntBase<VY>::dispose(home);
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return sizeof(*this);
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}
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template<class VY>
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ExecStatus
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EqInt<VY>::propagate(Space& home, const ModEventDelta& med) {
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// Add assigned views to value set
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if (IntView::me(med) == ME_INT_VAL)
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add(home);
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GECODE_ME_CHECK(y.gq(home, vs.size()));
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GECODE_ME_CHECK(y.lq(home, x.size() + vs.size()));
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if (x.size() == 0)
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return home.ES_SUBSUMED(*this);
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// All values must be in the value set
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if (y.max() == vs.size())
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return all_in_valset(home);
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// Compute positions of disjoint views and eliminate subsumed views
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Region r;
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int* dis; int n_dis;
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disjoint(home,r,dis,n_dis);
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// The number might have changed due to elimination of subsumed views
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GECODE_ME_CHECK(y.lq(home, x.size() + vs.size()));
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if (x.size() == 0) {
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assert(y.val() == vs.size());
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return home.ES_SUBSUMED(*this);
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}
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GECODE_ES_CHECK(prune_upper(home,g));
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// No lower bound pruning possible
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if (n_dis == 0)
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return ES_NOFIX;
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// Only if the propagator is at fixpoint here, continue with
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// propagating the lower bound
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if (IntView::me(Propagator::modeventdelta()) != ME_INT_NONE)
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return ES_NOFIX;
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// Do lower bound-based pruning
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GECODE_ES_CHECK(prune_lower(home,dis,n_dis));
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return ES_NOFIX;
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}
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}}}
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// STATISTICS: int-prop
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