Jip J. Dekker
1d9faf38de
git-subtree-dir: software/gecode git-subtree-split: 313e87646da4fc2752a70e83df16d993121a8e40
222 lines
7.5 KiB
C++
222 lines
7.5 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, 2008
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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 Branch {
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/// %Choice storing position and values for integer views
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class GECODE_VTABLE_EXPORT PosValuesChoice : public PosChoice {
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private:
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/// Information about position and minimum
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class PosMin {
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public:
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/// Start position of range
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unsigned int pos;
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/// Minmum of range
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int min;
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};
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/// Number of ranges
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unsigned int n;
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/// Values to assign to
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PosMin* pm;
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public:
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/// Initialize choice for brancher \a b, position \a p, and view \a x
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GECODE_INT_EXPORT
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PosValuesChoice(const Brancher& b, const Pos& p, IntView x);
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/// Initialize choice for brancher \a b from archive \a e
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GECODE_INT_EXPORT
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PosValuesChoice(const Brancher& b, unsigned int alt, Pos p, Archive& e);
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/// Return value to branch with for alternative \a a
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int val(unsigned int a) const;
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/// Deallocate
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GECODE_INT_EXPORT
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virtual ~PosValuesChoice(void);
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/// Archive into \a e
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GECODE_INT_EXPORT
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virtual void archive(Archive& e) const;
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};
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forceinline int
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PosValuesChoice::val(unsigned int a) const {
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PosMin* l = &pm[0];
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PosMin* r = &pm[n-1];
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while (true) {
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PosMin* m = l + (r-l)/2;
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if (a < m->pos) {
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r=m-1;
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} else if (a >= (m+1)->pos) {
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l=m+1;
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} else {
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return m->min + static_cast<int>(a - m->pos);
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}
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}
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GECODE_NEVER;
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return 0;
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}
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template<int n, bool min, class Filter, class Print>
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forceinline
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ViewValuesBrancher<n,min,Filter,Print>::
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ViewValuesBrancher(Home home, ViewArray<IntView>& x,
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ViewSel<IntView>* vs[n],
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IntBranchFilter bf,
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IntVarValPrint vvp)
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: ViewBrancher<IntView,Filter,n>(home,x,vs,bf), p(vvp) {
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if (p.notice())
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home.notice(*this,AP_DISPOSE,true);
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}
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template<int n, bool min, class Filter, class Print>
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forceinline void
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ViewValuesBrancher<n,min,Filter,Print>::post(Home home,
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ViewArray<IntView>& x,
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ViewSel<IntView>* vs[n],
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IntBranchFilter bf,
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IntVarValPrint vvp) {
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(void) new (home) ViewValuesBrancher<n,min,Filter,Print>(home,x,vs,bf,vvp);
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}
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template<int n, bool min, class Filter, class Print>
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forceinline
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ViewValuesBrancher<n,min,Filter,Print>::
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ViewValuesBrancher(Space& home, ViewValuesBrancher& b)
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: ViewBrancher<IntView,Filter,n>(home,b), p(b.p) {}
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template<int n, bool min, class Filter, class Print>
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Actor*
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ViewValuesBrancher<n,min,Filter,Print>::copy(Space& home) {
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return new (home) ViewValuesBrancher<n,min,Filter,Print>
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(home,*this);
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}
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template<int n, bool min, class Filter, class Print>
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const Choice*
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ViewValuesBrancher<n,min,Filter,Print>::choice(Space& home) {
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Pos p = ViewBrancher<IntView,Filter,n>::pos(home);
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return new PosValuesChoice(*this,p,
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ViewBrancher<IntView,Filter,n>::view(p));
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}
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template<int n, bool min, class Filter, class Print>
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const Choice*
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ViewValuesBrancher<n,min,Filter,Print>::choice
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(const Space& home, Archive& e) {
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(void) home;
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int p;
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unsigned int a;
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e >> p >> a;
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return new PosValuesChoice(*this,a,p,e);
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}
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template<int n, bool min, class Filter, class Print>
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ExecStatus
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ViewValuesBrancher<n,min,Filter,Print>::commit(Space& home, const Choice& c,
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unsigned int a) {
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const PosValuesChoice& pvc
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= static_cast<const PosValuesChoice&>(c);
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IntView x(ViewBrancher<IntView,Filter,n>::view(pvc.pos()));
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unsigned int b = min ? a : (pvc.alternatives() - 1 - a);
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return me_failed(x.eq(home,pvc.val(b))) ? ES_FAILED : ES_OK;
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}
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template<int n, bool min, class Filter, class Print>
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NGL*
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ViewValuesBrancher<n,min,Filter,Print>::ngl(Space& home, const Choice& c,
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unsigned int a) const {
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const PosValuesChoice& pvc
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= static_cast<const PosValuesChoice&>(c);
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IntView x(ViewBrancher<IntView,Filter,n>::view(pvc.pos()));
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unsigned int b = min ? a : (pvc.alternatives() - 1 - a);
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return new (home) EqNGL<IntView>(home,x,pvc.val(b));
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}
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template<int n, bool min, class Filter, class Print>
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void
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ViewValuesBrancher<n,min,Filter,Print>::print(const Space& home,
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const Choice& c,
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unsigned int a,
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std::ostream& o) const {
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const PosValuesChoice& pvc
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= static_cast<const PosValuesChoice&>(c);
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IntView x(ViewBrancher<IntView,Filter,n>::view(pvc.pos()));
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unsigned int b = min ? a : (pvc.alternatives() - 1 - a);
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int nn = pvc.val(b);
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if (p)
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p(home,*this,a,x,pvc.pos().pos,nn,o);
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else
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o << "var[" << pvc.pos().pos << "] = " << nn;
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}
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template<int n, bool min, class Filter, class Print>
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forceinline size_t
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ViewValuesBrancher<n,min,Filter,Print>::dispose(Space& home) {
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if (p.notice())
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home.ignore(*this,AP_DISPOSE,true);
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(void) ViewBrancher<IntView,Filter,n>::dispose(home);
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return sizeof(ViewValuesBrancher<n,min,Filter,Print>);
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}
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template<int n, bool min>
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forceinline void
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postviewvaluesbrancher(Home home, ViewArray<IntView>& x,
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ViewSel<IntView>* vs[n],
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IntBranchFilter bf,
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IntVarValPrint vvp) {
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if (bf) {
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if (vvp) {
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ViewValuesBrancher<n,min,BrancherFilter<IntView>,
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BrancherPrint<IntView,int> >
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::post(home,x,vs,bf,vvp);
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} else {
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ViewValuesBrancher<n,min,BrancherFilter<IntView>,
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BrancherNoPrint<IntView,int> >
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::post(home,x,vs,bf,vvp);
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}
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} else {
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if (vvp) {
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ViewValuesBrancher<n,min,BrancherNoFilter<IntView>,
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BrancherPrint<IntView,int> >
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::post(home,x,vs,bf,vvp);
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} else {
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ViewValuesBrancher<n,min,BrancherNoFilter<IntView>,
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BrancherNoPrint<IntView,int> >
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::post(home,x,vs,bf,vvp);
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}
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}
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}
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}}}
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// STATISTICS: int-branch
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