Jip J. Dekker
f2a1c4e389
git-subtree-dir: software/mza git-subtree-split: f970a59b177c13ca3dd8aaef8cc6681d83b7e813
206 lines
6.7 KiB
C++
206 lines
6.7 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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* Pierre WILKE (wilke.pierre@gmail.com)
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* Andrea Rendl (andrea.rendl@nicta.com.au)
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __GECODE_AUX_BRANCHER_HH__
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#define __GECODE_AUX_BRANCHER_HH__
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#include <gecode/int.hh>
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#include <gecode/kernel.hh>
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#include <gecode/search.hh>
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#ifdef GECODE_HAS_SET_VARS
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#include <gecode/set.hh>
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#endif
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#ifdef GECODE_HAS_FLOAT_VARS
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#include <gecode/float.hh>
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#endif
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#include <minizinc/solvers/gecode_solverinstance.hh>
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#include <gecode/driver.hh>
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/**
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* \brief Branching on the introduced variables
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*
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* This brancher makes sure that when a solution is found for the model
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* variables, all introduced variables are either assigned, or the solution
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* can be extended to a solution of the introduced variables.
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*
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* The advantage over simply branching over the introduced variables is that
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* only one such extension will be searched for, instead of enumerating all
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* possible (equivalent) extensions.
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*
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*/
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namespace MiniZinc {
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class AuxVarBrancher : public Gecode::Brancher {
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protected:
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/// Flag whether brancher is done
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bool done;
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/// Construct brancher
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AuxVarBrancher(Gecode::Home home, Gecode::TieBreak<Gecode::IntVarBranch> int_varsel0,
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Gecode::IntValBranch int_valsel0,
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Gecode::TieBreak<Gecode::BoolVarBranch> bool_varsel0,
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Gecode::BoolValBranch bool_valsel0
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#ifdef GECODE_HAS_SET_VARS
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,
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Gecode::SetVarBranch set_varsel0, Gecode::SetValBranch set_valsel0
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#endif
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#ifdef GECODE_HAS_FLOAT_VARS
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,
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Gecode::TieBreak<Gecode::FloatVarBranch> float_varsel0,
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Gecode::FloatValBranch float_valsel0
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#endif
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)
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: Brancher(home),
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done(false),
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int_varsel(int_varsel0),
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int_valsel(int_valsel0),
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bool_varsel(bool_varsel0),
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bool_valsel(bool_valsel0)
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#ifdef GECODE_HAS_SET_VARS
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,
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set_varsel(set_varsel0),
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set_valsel(set_valsel0)
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#endif
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#ifdef GECODE_HAS_FLOAT_VARS
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,
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float_varsel(float_varsel0),
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float_valsel(float_valsel0)
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#endif
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{
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}
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/// Copy constructor
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AuxVarBrancher(Gecode::Space& home, AuxVarBrancher& b) : Brancher(home, b), done(b.done) {}
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/// %Choice that only signals failure or success
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class Choice : public Gecode::Choice {
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public:
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/// Whether brancher should fail
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bool fail;
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/// Initialize choice for brancher \a b
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Choice(const Brancher& b, bool fail0) : Gecode::Choice(b, 1), fail(fail0) {}
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/// Report size occupied
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virtual size_t size(void) const { return sizeof(Choice); }
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/// Archive into \a e
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virtual void archive(Gecode::Archive& e) const {
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Gecode::Choice::archive(e);
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e.put(fail);
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}
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};
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Gecode::TieBreak<Gecode::IntVarBranch> int_varsel;
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Gecode::IntValBranch int_valsel;
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Gecode::TieBreak<Gecode::BoolVarBranch> bool_varsel;
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Gecode::BoolValBranch bool_valsel;
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#ifdef GECODE_HAS_SET_VARS
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Gecode::SetVarBranch set_varsel;
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Gecode::SetValBranch set_valsel;
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#endif
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#ifdef GECODE_HAS_FLOAT_VARS
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Gecode::TieBreak<Gecode::FloatVarBranch> float_varsel;
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Gecode::FloatValBranch float_valsel;
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#endif
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public:
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/// Check status of brancher, return true if alternatives left.
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virtual bool status(const Gecode::Space& _home) const {
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if (done) return false;
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const MiniZinc::FznSpace& home = static_cast<const MiniZinc::FznSpace&>(_home);
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for (int i = 0; i < home.iv_aux.size(); i++)
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if (!home.iv_aux[i].assigned()) return true;
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for (int i = 0; i < home.bv_aux.size(); i++)
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if (!home.bv_aux[i].assigned()) return true;
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#ifdef GECODE_HAS_SET_VARS
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for (int i = 0; i < home.sv_aux.size(); i++)
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if (!home.sv_aux[i].assigned()) return true;
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#endif
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#ifdef GECODE_HAS_FLOAT_VARS
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for (int i = 0; i < home.fv_aux.size(); i++)
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if (!home.fv_aux[i].assigned()) return true;
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#endif
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// No non-assigned variables left
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return false;
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}
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/// Return choice
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virtual Choice* choice(Gecode::Space& home) {
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done = true;
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MiniZinc::FznSpace& fzs = static_cast<MiniZinc::FznSpace&>(*home.clone());
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fzs._copyAuxVars = false;
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Gecode::branch(fzs, fzs.iv_aux, int_varsel, int_valsel);
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Gecode::branch(fzs, fzs.bv_aux, bool_varsel, bool_valsel);
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#ifdef GECODE_HAS_SET_VARS
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Gecode::branch(fzs, fzs.sv_aux, set_varsel, set_valsel);
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#endif
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#ifdef GECODE_HAS_FLOAT_VARS
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Gecode::branch(fzs, fzs.fv_aux, float_varsel, float_valsel);
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#endif
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Gecode::Search::Options opt;
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opt.clone = false;
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MiniZinc::FznSpace* sol = Gecode::dfs(&fzs, opt);
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if (sol) {
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delete sol;
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return new Choice(*this, false);
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} else {
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return new Choice(*this, true);
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}
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}
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/// Return choice
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virtual Choice* choice(const Gecode::Space&, Gecode::Archive& e) {
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bool fail;
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e >> fail;
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return new Choice(*this, fail);
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}
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/// Perform commit for choice \a c
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virtual Gecode::ExecStatus commit(Gecode::Space&, const Gecode::Choice& c, unsigned int) {
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return static_cast<const Choice&>(c).fail ? Gecode::ES_FAILED : Gecode::ES_OK;
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}
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/// Print explanation
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virtual void print(const Gecode::Space&, const Gecode::Choice& c, unsigned int,
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std::ostream& o) const {
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o << "FlatZinc(" << (static_cast<const Choice&>(c).fail ? "fail" : "ok") << ")";
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}
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/// Copy brancher
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virtual Actor* copy(Gecode::Space& home) { return new (home) AuxVarBrancher(home, *this); }
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/// Post brancher
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static void post(Gecode::Home home, Gecode::TieBreak<Gecode::IntVarBranch> int_varsel,
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Gecode::IntValBranch int_valsel,
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Gecode::TieBreak<Gecode::BoolVarBranch> bool_varsel,
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Gecode::BoolValBranch bool_valsel
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#ifdef GECODE_HAS_SET_VARS
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,
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Gecode::SetVarBranch set_varsel, Gecode::SetValBranch set_valsel
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#endif
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#ifdef GECODE_HAS_FLOAT_VARS
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,
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Gecode::TieBreak<Gecode::FloatVarBranch> float_varsel,
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Gecode::FloatValBranch float_valsel
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#endif
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) {
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(void)new (home) AuxVarBrancher(home, int_varsel, int_valsel, bool_varsel, bool_valsel
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#ifdef GECODE_HAS_SET_VARS
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,
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set_varsel, set_valsel
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#endif
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#ifdef GECODE_HAS_FLOAT_VARS
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,
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float_varsel, float_valsel
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#endif
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);
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}
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/// Delete brancher and return its size
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virtual size_t dispose(Gecode::Space&) { return sizeof(*this); }
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};
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} // namespace MiniZinc
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#endif
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