Jip J. Dekker
3e72b0e857
git-subtree-dir: software/gecode_on_record git-subtree-split: 37ed9bda495ea87e63217c19a374b5a93bb0078e
324 lines
8.5 KiB
C++
Executable File
324 lines
8.5 KiB
C++
Executable File
/* -*- 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, 2004
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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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namespace Gecode { namespace Int { namespace Linear {
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/*
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* Base-class
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*
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*/
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template<class XV, class YV>
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forceinline
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LinBoolView<XV,YV>::LinBoolView(Home home,
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ViewArray<XV>& x0, YV y0, int c0)
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: Propagator(home), x(x0), y(y0), c(c0) {
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x.subscribe(home,*this,PC_INT_VAL);
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y.subscribe(home,*this,PC_INT_BND);
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}
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template<class XV, class YV>
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forceinline size_t
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LinBoolView<XV,YV>::dispose(Space& home) {
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x.cancel(home,*this,PC_INT_VAL);
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y.cancel(home,*this,PC_INT_BND);
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(void) Propagator::dispose(home);
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return sizeof(*this);
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}
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template<class XV, class YV>
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forceinline
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LinBoolView<XV,YV>::LinBoolView(Space& home, LinBoolView& p)
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: Propagator(home,p), c(p.c) {
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x.update(home,p.x);
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y.update(home,p.y);
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}
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template<class XV, class YV>
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PropCost
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LinBoolView<XV,YV>::cost(const Space&, const ModEventDelta&) const {
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return PropCost::linear(PropCost::LO, x.size());
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}
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template<class XV, class YV>
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void
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LinBoolView<XV,YV>::reschedule(Space& home) {
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x.reschedule(home,*this,PC_INT_VAL);
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y.reschedule(home,*this,PC_INT_BND);
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}
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/*
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* Equality propagator
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*
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*/
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template<class XV, class YV>
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forceinline
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EqBoolView<XV,YV>::EqBoolView(Home home, ViewArray<XV>& x, YV y, int c)
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: LinBoolView<XV,YV>(home,x,y,c) {}
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template<class XV, class YV>
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ExecStatus
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EqBoolView<XV,YV>::post(Home home, ViewArray<XV>& x, YV y, int c) {
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if (y.assigned())
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return EqBoolInt<XV>::post(home,x,y.val()+c);
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int n = x.size();
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for (int i=n; i--; )
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if (x[i].one()) {
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x[i]=x[--n]; c--;
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} else if (x[i].zero()) {
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x[i]=x[--n];
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}
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x.size(n);
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GECODE_ME_CHECK(y.lq(home,n-c));
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GECODE_ME_CHECK(y.gq(home,-c));
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if (n == 0)
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return ES_OK;
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if (y.min()+c == n) {
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assert(y.assigned());
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for (int i=0; i<n; i++)
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GECODE_ME_CHECK(x[i].one_none(home));
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return ES_OK;
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}
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if (y.max()+c == 0) {
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assert(y.assigned());
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for (int i=0; i<n; i++)
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GECODE_ME_CHECK(x[i].zero_none(home));
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return ES_OK;
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}
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(void) new (home) EqBoolView<XV,YV>(home,x,y,c);
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return ES_OK;
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}
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template<class XV, class YV>
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forceinline
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EqBoolView<XV,YV>::EqBoolView(Space& home, EqBoolView<XV,YV>& p)
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: LinBoolView<XV,YV>(home,p) {}
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template<class XV, class YV>
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Actor*
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EqBoolView<XV,YV>::copy(Space& home) {
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return new (home) EqBoolView<XV,YV>(home,*this);
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}
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template<class XV, class YV>
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ExecStatus
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EqBoolView<XV,YV>::propagate(Space& home, const ModEventDelta&) {
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int n = x.size();
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for (int i=n; i--; )
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if (x[i].one()) {
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x[i]=x[--n]; c--;
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} else if (x[i].zero()) {
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x[i]=x[--n];
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}
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x.size(n);
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GECODE_ME_CHECK(y.lq(home,n-c));
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GECODE_ME_CHECK(y.gq(home,-c));
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if (n == 0)
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return home.ES_SUBSUMED(*this);
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if (y.min()+c == n) {
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assert(y.assigned());
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for (int i=0; i<n; i++)
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GECODE_ME_CHECK(x[i].one_none(home));
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return home.ES_SUBSUMED(*this);
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}
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if (y.max()+c == 0) {
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assert(y.assigned());
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for (int i=0; i<n; i++)
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GECODE_ME_CHECK(x[i].zero_none(home));
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return home.ES_SUBSUMED(*this);
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}
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if (y.assigned())
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GECODE_REWRITE(*this,EqBoolInt<XV>::post(home(*this),x,y.val()+c));
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return ES_FIX;
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}
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/*
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* Disequality propagator
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*
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*/
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template<class XV, class YV>
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forceinline
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NqBoolView<XV,YV>::NqBoolView(Home home, ViewArray<XV>& x, YV y, int c)
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: LinBoolView<XV,YV>(home,x,y,c) {}
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template<class XV, class YV>
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ExecStatus
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NqBoolView<XV,YV>::post(Home home, ViewArray<XV>& x, YV y, int c) {
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if (y.assigned())
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return NqBoolInt<XV>::post(home,x,y.val()+c);
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int n = x.size();
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for (int i = n; i--; )
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if (x[i].one()) {
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x[i]=x[--n]; c--;
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} else if (x[i].zero()) {
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x[i]=x[--n];
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}
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x.size(n);
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if ((n-c < y.min() ) || (-c > y.max()))
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return ES_OK;
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if (n == 0) {
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GECODE_ME_CHECK(y.nq(home,-c));
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return ES_OK;
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}
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if ((n == 1) && y.assigned()) {
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if (y.val()+c == 1) {
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GECODE_ME_CHECK(x[0].zero_none(home));
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} else {
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assert(y.val()+c == 0);
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GECODE_ME_CHECK(x[0].one_none(home));
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}
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return ES_OK;
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}
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(void) new (home) NqBoolView<XV,YV>(home,x,y,c);
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return ES_OK;
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}
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template<class XV, class YV>
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forceinline
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NqBoolView<XV,YV>::NqBoolView(Space& home, NqBoolView<XV,YV>& p)
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: LinBoolView<XV,YV>(home,p) {}
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template<class XV, class YV>
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Actor*
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NqBoolView<XV,YV>::copy(Space& home) {
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return new (home) NqBoolView<XV,YV>(home,*this);
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}
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template<class XV, class YV>
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ExecStatus
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NqBoolView<XV,YV>::propagate(Space& home, const ModEventDelta&) {
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int n = x.size();
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for (int i = n; i--; )
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if (x[i].one()) {
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x[i]=x[--n]; c--;
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} else if (x[i].zero()) {
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x[i]=x[--n];
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}
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x.size(n);
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if ((n-c < y.min() ) || (-c > y.max()))
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return home.ES_SUBSUMED(*this);
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if (n == 0) {
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GECODE_ME_CHECK(y.nq(home,-c));
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return home.ES_SUBSUMED(*this);
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}
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if ((n == 1) && y.assigned()) {
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if (y.val()+c == 1) {
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GECODE_ME_CHECK(x[0].zero_none(home));
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} else {
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assert(y.val()+c == 0);
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GECODE_ME_CHECK(x[0].one_none(home));
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}
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return home.ES_SUBSUMED(*this);
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}
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return ES_FIX;
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}
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/*
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* Greater or equal propagator
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*
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*/
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template<class XV, class YV>
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forceinline
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GqBoolView<XV,YV>::GqBoolView(Home home, ViewArray<XV>& x, YV y, int c)
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: LinBoolView<XV,YV>(home,x,y,c) {}
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template<class XV, class YV>
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ExecStatus
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GqBoolView<XV,YV>::post(Home home, ViewArray<XV>& x, YV y, int c) {
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if (y.assigned())
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return GqBoolInt<XV>::post(home,x,y.val()+c);
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// Eliminate assigned views
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int n = x.size();
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for (int i = n; i--; )
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if (x[i].one()) {
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x[i]=x[--n]; c--;
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} else if (x[i].zero()) {
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x[i]=x[--n];
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}
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x.size(n);
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GECODE_ME_CHECK(y.lq(home,n-c));
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if (-c >= y.max())
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return ES_OK;
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if (y.min()+c == n) {
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for (int i = n; i--; )
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GECODE_ME_CHECK(x[i].one_none(home));
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return ES_OK;
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}
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(void) new (home) GqBoolView<XV,YV>(home,x,y,c);
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return ES_OK;
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}
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template<class XV, class YV>
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forceinline
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GqBoolView<XV,YV>::GqBoolView(Space& home, GqBoolView<XV,YV>& p)
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: LinBoolView<XV,YV>(home,p) {}
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template<class XV, class YV>
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Actor*
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GqBoolView<XV,YV>::copy(Space& home) {
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return new (home) GqBoolView<XV,YV>(home,*this);
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}
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template<class XV, class YV>
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ExecStatus
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GqBoolView<XV,YV>::propagate(Space& home, const ModEventDelta&) {
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int n = x.size();
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for (int i = n; i--; )
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if (x[i].one()) {
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x[i]=x[--n]; c--;
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} else if (x[i].zero()) {
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x[i]=x[--n];
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}
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x.size(n);
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GECODE_ME_CHECK(y.lq(home,n-c));
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if (-c >= y.max())
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return home.ES_SUBSUMED(*this);
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if (y.min()+c == n) {
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for (int i = n; i--; )
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GECODE_ME_CHECK(x[i].one_none(home));
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return home.ES_SUBSUMED(*this);
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}
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if (y.assigned())
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GECODE_REWRITE(*this,GqBoolInt<XV>::post(home(*this),x,y.val()+c));
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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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