Jip J. Dekker
1d9faf38de
git-subtree-dir: software/gecode git-subtree-split: 313e87646da4fc2752a70e83df16d993121a8e40
343 lines
9.6 KiB
C++
Executable File
343 lines
9.6 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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* Vincent Barichard <Vincent.Barichard@univ-angers.fr>
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*
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* Copyright:
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* Christian Schulte, 2004
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* Vincent Barichard, 2012
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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 Float { namespace Rel {
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/*
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* Binary bounds consistent equality
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*
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*/
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template<class View0, class View1>
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forceinline
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Eq<View0,View1>::Eq(Home home, View0 x0, View1 x1)
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: MixBinaryPropagator<View0,PC_FLOAT_BND,View1,PC_FLOAT_BND>(home,x0,x1) {}
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template<class View0, class View1>
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ExecStatus
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Eq<View0,View1>::post(Home home, View0 x0, View1 x1){
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if (x0.assigned()) {
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GECODE_ME_CHECK(x1.eq(home,x0.val()));
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} else if (x1.assigned()) {
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GECODE_ME_CHECK(x0.eq(home,x1.val()));
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} else if (x0 != x1) {
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GECODE_ME_CHECK(x0.lq(home,x1.max()));
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GECODE_ME_CHECK(x1.lq(home,x0.max()));
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GECODE_ME_CHECK(x0.gq(home,x1.min()));
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GECODE_ME_CHECK(x1.gq(home,x0.min()));
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(void) new (home) Eq<View0,View1>(home,x0,x1);
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}
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return ES_OK;
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}
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template<class View0, class View1>
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forceinline
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Eq<View0,View1>::Eq(Space& home, Eq<View0,View1>& p)
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: MixBinaryPropagator<View0,PC_FLOAT_BND,View1,PC_FLOAT_BND>(home,p) {}
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template<class View0, class View1>
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forceinline
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Eq<View0,View1>::Eq(Space& home, Propagator& p,
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View0 x0, View1 x1)
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: MixBinaryPropagator<View0,PC_FLOAT_BND,View1,PC_FLOAT_BND>(home,p,
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x0,x1) {}
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template<class View0, class View1>
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Actor*
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Eq<View0,View1>::copy(Space& home) {
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return new (home) Eq<View0,View1>(home,*this);
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}
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template<class View0, class View1>
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ExecStatus
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Eq<View0,View1>::propagate(Space& home, const ModEventDelta&) {
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if (x0.assigned()) {
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GECODE_ME_CHECK(x1.eq(home,x0.val()));
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} else if (x1.assigned()) {
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GECODE_ME_CHECK(x0.eq(home,x1.val()));
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} else {
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do {
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GECODE_ME_CHECK(x0.gq(home,x1.min()));
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GECODE_ME_CHECK(x1.gq(home,x0.min()));
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} while (x0.min() != x1.min());
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do {
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GECODE_ME_CHECK(x0.lq(home,x1.max()));
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GECODE_ME_CHECK(x1.lq(home,x0.max()));
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} while (x0.max() != x1.max());
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if (!x0.assigned())
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return ES_FIX;
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}
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assert(x0.assigned() && x1.assigned());
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return home.ES_SUBSUMED(*this);
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}
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/*
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* Nary bound consistent equality
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*
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*/
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template<class View>
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forceinline
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NaryEq<View>::NaryEq(Home home, ViewArray<View>& x)
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: NaryPropagator<View,PC_FLOAT_BND>(home,x) {}
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template<class View>
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ExecStatus
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NaryEq<View>::post(Home home, ViewArray<View>& x) {
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x.unique(home);
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if (x.size() == 2) {
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return Eq<View,View>::post(home,x[0],x[1]);
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} else if (x.size() > 2) {
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FloatNum l = x[0].min();
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FloatNum u = x[0].max();
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for (int i=x.size(); i-- > 1; ) {
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l = std::max(l,x[i].min());
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u = std::min(u,x[i].max());
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}
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for (int i=x.size(); i--; ) {
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GECODE_ME_CHECK(x[i].gq(home,l));
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GECODE_ME_CHECK(x[i].lq(home,u));
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}
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(void) new (home) NaryEq<View>(home,x);
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}
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return ES_OK;
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}
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template<class View>
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forceinline
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NaryEq<View>::NaryEq(Space& home, NaryEq<View>& p)
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: NaryPropagator<View,PC_FLOAT_BND>(home,p) {}
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template<class View>
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Actor*
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NaryEq<View>::copy(Space& home) {
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return new (home) NaryEq<View>(home,*this);
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}
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template<class View>
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PropCost
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NaryEq<View>::cost(const Space&, const ModEventDelta& med) const {
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if (View::me(med) == ME_FLOAT_VAL)
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return PropCost::unary(PropCost::LO);
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else
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return PropCost::linear(PropCost::LO, x.size());
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}
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template<class View>
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ExecStatus
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NaryEq<View>::propagate(Space& home, const ModEventDelta& med) {
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assert(x.size() > 2);
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if (View::me(med) == ME_FLOAT_VAL) {
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// One of the variables is assigned
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for (int i = 0; ; i++)
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if (x[i].assigned()) {
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FloatVal n = x[i].val();
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x.move_lst(i);
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for (int j = x.size(); j--; )
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GECODE_ME_CHECK(x[j].eq(home,n));
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return home.ES_SUBSUMED(*this);
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}
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GECODE_NEVER;
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}
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FloatNum mn = x[0].min();
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restart_min:
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for (int i = x.size(); i--; ) {
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GECODE_ME_CHECK(x[i].gq(home,mn));
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if (mn < x[i].min()) {
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mn = x[i].min();
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goto restart_min;
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}
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}
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FloatNum mx = x[0].max();
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restart_max:
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for (int i = x.size(); i--; ) {
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GECODE_ME_CHECK(x[i].lq(home,mx));
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if (mx > x[i].max()) {
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mx = x[i].max();
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goto restart_max;
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}
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}
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return x[0].assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
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}
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/*
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* Reified bounds consistent equality
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*
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*/
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template<class View, class CtrlView, ReifyMode rm>
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forceinline
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ReEq<View,CtrlView,rm>::ReEq(Home home, View x0, View x1, CtrlView b)
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: Int::ReBinaryPropagator<View,PC_FLOAT_BND,CtrlView>(home,x0,x1,b) {}
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template<class View, class CtrlView, ReifyMode rm>
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ExecStatus
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ReEq<View,CtrlView,rm>::post(Home home, View x0, View x1, CtrlView b){
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if (b.one()) {
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if (rm == RM_PMI)
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return ES_OK;
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return Eq<View,View>::post(home,x0,x1);
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}
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if (b.zero()) {
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if (rm == RM_IMP)
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return ES_OK;
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return Nq<View,View>::post(home,x0,x1);
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}
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if (x0 != x1) {
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(void) new (home) ReEq(home,x0,x1,b);
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} else if (rm != RM_IMP) {
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GECODE_ME_CHECK(b.one(home));
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}
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return ES_OK;
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}
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template<class View, class CtrlView, ReifyMode rm>
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forceinline
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ReEq<View,CtrlView,rm>::ReEq(Space& home, ReEq& p)
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: Int::ReBinaryPropagator<View,PC_FLOAT_BND,CtrlView>(home,p) {}
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template<class View, class CtrlView, ReifyMode rm>
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Actor*
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ReEq<View,CtrlView,rm>::copy(Space& home) {
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return new (home) ReEq<View,CtrlView,rm>(home,*this);
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}
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template<class View, class CtrlView, ReifyMode rm>
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ExecStatus
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ReEq<View,CtrlView,rm>::propagate(Space& home, const ModEventDelta&) {
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if (b.one()) {
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if (rm == RM_PMI)
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return home.ES_SUBSUMED(*this);
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GECODE_REWRITE(*this,(Eq<View,View>::post(home(*this),x0,x1)));
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}
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if (b.zero()) {
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if (rm == RM_IMP)
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return home.ES_SUBSUMED(*this);
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GECODE_REWRITE(*this,(Nq<View,View>::post(home(*this),x0,x1)));
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}
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switch (rtest_eq(x0,x1)) {
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case RT_TRUE:
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if (rm != RM_IMP)
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GECODE_ME_CHECK(b.one_none(home));
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break;
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case RT_FALSE:
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if (rm != RM_PMI)
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GECODE_ME_CHECK(b.zero_none(home));
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break;
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case RT_MAYBE:
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return ES_FIX;
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default: GECODE_NEVER;
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}
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return home.ES_SUBSUMED(*this);
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}
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/*
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* Reified bounds consistent equality (one variable)
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*
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*/
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template<class View, class CtrlView, ReifyMode rm>
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forceinline
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ReEqFloat<View,CtrlView,rm>::ReEqFloat
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(Home home, View x, FloatVal c0, CtrlView b)
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: Int::ReUnaryPropagator<View,PC_FLOAT_BND,CtrlView>(home,x,b), c(c0) {}
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template<class View, class CtrlView, ReifyMode rm>
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ExecStatus
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ReEqFloat<View,CtrlView,rm>::post(Home home, View x, FloatVal c, CtrlView b) {
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if (b.one()) {
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if (rm != RM_PMI)
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GECODE_ME_CHECK(x.eq(home,c));
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} else if (x.assigned()) {
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if (overlap(x.val(),c)) {
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if (rm != RM_IMP)
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GECODE_ME_CHECK(b.one(home));
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} else {
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if (rm != RM_PMI)
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GECODE_ME_CHECK(b.zero(home));
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}
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} else {
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(void) new (home) ReEqFloat(home,x,c,b);
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}
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return ES_OK;
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}
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template<class View, class CtrlView, ReifyMode rm>
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forceinline
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ReEqFloat<View,CtrlView,rm>::ReEqFloat(Space& home, ReEqFloat& p)
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: Int::ReUnaryPropagator<View,PC_FLOAT_BND,CtrlView>(home,p), c(p.c) {}
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template<class View, class CtrlView, ReifyMode rm>
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Actor*
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ReEqFloat<View,CtrlView,rm>::copy(Space& home) {
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return new (home) ReEqFloat<View,CtrlView,rm>(home,*this);
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}
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template<class View, class CtrlView, ReifyMode rm>
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ExecStatus
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ReEqFloat<View,CtrlView,rm>::propagate(Space& home, const ModEventDelta&) {
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if (b.one()) {
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if (rm != RM_PMI)
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GECODE_ME_CHECK(x0.eq(home,c));
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} else {
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switch (rtest_eq(x0,c)) {
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case RT_TRUE:
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if (rm != RM_IMP)
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GECODE_ME_CHECK(b.one(home));
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break;
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case RT_FALSE:
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if (rm != RM_PMI)
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GECODE_ME_CHECK(b.zero(home));
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break;
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case RT_MAYBE:
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return ES_FIX;
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default: GECODE_NEVER;
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}
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}
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return home.ES_SUBSUMED(*this);
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}
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}}}
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// STATISTICS: float-prop
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