branch.cpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2012
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <gecode/float/branch.hh>
namespace Gecode {
void
branch(Home home, const FloatVarArgs& x,
FloatVarBranch vars, FloatValBranch vals,
FloatBranchFilter bf,
FloatVarValPrint vvp) {
using namespace Float;
if (home.failed()) return;
vars.expand(home,x);
ViewArray<FloatView> xv(home,x);
ViewSel<FloatView>* vs[1] = {
Branch::viewsel(home,vars)
};
postviewvalbrancher<FloatView,1,FloatNumBranch,2>
(home,xv,vs,Branch::valselcommit(home,vals),bf,vvp);
}
void
branch(Home home, const FloatVarArgs& x,
TieBreak<FloatVarBranch> vars, FloatValBranch vals,
FloatBranchFilter bf,
FloatVarValPrint vvp) {
using namespace Float;
if (home.failed()) return;
vars.a.expand(home,x);
if ((vars.a.select() == FloatVarBranch::SEL_NONE) ||
(vars.a.select() == FloatVarBranch::SEL_RND))
vars.b = FLOAT_VAR_NONE();
vars.b.expand(home,x);
if ((vars.b.select() == FloatVarBranch::SEL_NONE) ||
(vars.b.select() == FloatVarBranch::SEL_RND))
vars.c = FLOAT_VAR_NONE();
vars.c.expand(home,x);
if ((vars.c.select() == FloatVarBranch::SEL_NONE) ||
(vars.c.select() == FloatVarBranch::SEL_RND))
vars.d = FLOAT_VAR_NONE();
vars.d.expand(home,x);
if (vars.b.select() == FloatVarBranch::SEL_NONE) {
branch(home,x,vars.a,vals,bf,vvp);
} else {
ViewArray<FloatView> xv(home,x);
ValSelCommitBase<FloatView,FloatNumBranch>*
vsc = Branch::valselcommit(home,vals);
if (vars.c.select() == FloatVarBranch::SEL_NONE) {
ViewSel<FloatView>* vs[2] = {
Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b)
};
postviewvalbrancher<FloatView,2,FloatNumBranch,2>
(home,xv,vs,vsc,bf,vvp);
} else if (vars.d.select() == FloatVarBranch::SEL_NONE) {
ViewSel<FloatView>* vs[3] = {
Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
Branch::viewsel(home,vars.c)
};
postviewvalbrancher<FloatView,3,FloatNumBranch,2>
(home,xv,vs,vsc,bf,vvp);
} else {
ViewSel<FloatView>* vs[4] = {
Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
Branch::viewsel(home,vars.c),Branch::viewsel(home,vars.d)
};
postviewvalbrancher<FloatView,4,FloatNumBranch,2>
(home,xv,vs,vsc,bf,vvp);
}
}
}
void
branch(Home home, FloatVar x, FloatValBranch vals, FloatVarValPrint vvp) {
FloatVarArgs xv(1); xv[0]=x;
branch(home, xv, FLOAT_VAR_NONE(), vals, nullptr, vvp);
}
void
assign(Home home, const FloatVarArgs& x,
FloatVarBranch vars, FloatAssign vals,
FloatBranchFilter bf,
FloatVarValPrint vvp) {
using namespace Float;
if (home.failed()) return;
ViewArray<FloatView> xv(home,x);
ViewSel<FloatView>* vs[1] = {
new (home) ViewSelNone<FloatView>(home,vars)
};
postviewvalbrancher<FloatView,1,FloatNumBranch,1>
(home,xv,vs,Branch::valselcommit(home,vals),bf,vvp);
}
void
assign(Home home, const FloatVarArgs& x,
TieBreak<FloatVarBranch> vars, FloatAssign vals,
FloatBranchFilter bf,
FloatVarValPrint vvp) {
using namespace Float;
if (home.failed()) return;
vars.a.expand(home,x);
if ((vars.a.select() == FloatVarBranch::SEL_NONE) ||
(vars.a.select() == FloatVarBranch::SEL_RND))
vars.b = FLOAT_VAR_NONE();
vars.b.expand(home,x);
if ((vars.b.select() == FloatVarBranch::SEL_NONE) ||
(vars.b.select() == FloatVarBranch::SEL_RND))
vars.c = FLOAT_VAR_NONE();
vars.c.expand(home,x);
if ((vars.c.select() == FloatVarBranch::SEL_NONE) ||
(vars.c.select() == FloatVarBranch::SEL_RND))
vars.d = FLOAT_VAR_NONE();
vars.d.expand(home,x);
if (vars.b.select() == FloatVarBranch::SEL_NONE) {
assign(home,x,vars.a,vals,bf,vvp);
} else {
ViewArray<FloatView> xv(home,x);
ValSelCommitBase<FloatView,FloatNumBranch>*
vsc = Branch::valselcommit(home,vals);
if (vars.c.select() == FloatVarBranch::SEL_NONE) {
ViewSel<FloatView>* vs[2] = {
Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b)
};
postviewvalbrancher<FloatView,2,FloatNumBranch,1>
(home,xv,vs,vsc,bf,vvp);
} else if (vars.d.select() == FloatVarBranch::SEL_NONE) {
ViewSel<FloatView>* vs[3] = {
Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
Branch::viewsel(home,vars.c)
};
postviewvalbrancher<FloatView,3,FloatNumBranch,1>
(home,xv,vs,vsc,bf,vvp);
} else {
ViewSel<FloatView>* vs[4] = {
Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
Branch::viewsel(home,vars.c),Branch::viewsel(home,vars.d)
};
postviewvalbrancher<FloatView,4,FloatNumBranch,1>
(home,xv,vs,vsc,bf,vvp);
}
}
}
void
assign(Home home, FloatVar x, FloatAssign vals, FloatVarValPrint vvp) {
FloatVarArgs xv(1); xv[0]=x;
assign(home, xv, FLOAT_VAR_NONE(), vals, nullptr, vvp);
}
}
// STATISTICS: float-post
Gecode::FloatAssign
Which values to select for assignment.
Definition float.hh:1874
Gecode::FloatValBranch
Which values to select for branching first.
Definition float.hh:1820
Gecode::FloatVarArgs
Passing float variables.
Definition float.hh:979
Gecode::FloatVarBranch
Which variable to select for branching.
Definition float.hh:1668
Gecode::FloatVarBranch::expand
void expand(Home home, const FloatVarArgs &x)
Expand AFC, action, and CHB.
Definition var.hpp:74
Gecode::FloatVarBranch::SEL_NONE
@ SEL_NONE
First unassigned.
Definition float.hh:1672
Gecode::FloatVarBranch::SEL_RND
@ SEL_RND
Random (uniform, for tie breaking).
Definition float.hh:1673
Gecode::FloatVar
Float variables.
Definition float.hh:870
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::Home::failed
bool failed(void) const
Check whether corresponding space is failed.
Definition core.hpp:4048
Gecode::TieBreak
Combine variable selection criteria for tie-breaking.
Definition tiebreak.hpp:38
Gecode::TieBreak::b
VarBranch b
Definition tiebreak.hpp:41
Gecode::TieBreak::a
VarBranch a
Branching criteria to try in order.
Definition tiebreak.hpp:41
Gecode::TieBreak::c
VarBranch c
Definition tiebreak.hpp:41
Gecode::TieBreak::d
VarBranch d
Definition tiebreak.hpp:41
Gecode::ValSelCommitBase
Base class for value selection and commit.
Definition val-sel-commit.hpp:44
Gecode::ViewArray
View arrays.
Definition array.hpp:253
Gecode::ViewSelNone
Select the first unassigned view.
Definition view-sel.hpp:109
Gecode::ViewSel
Abstract class for view selection.
Definition view-sel.hpp:44
branch.hh
Gecode::FloatBranchFilter
std::function< bool(const Space &home, FloatVar x, int i)> FloatBranchFilter
Branch filter function type for float variables.
Definition float.hh:1442
Gecode::assign
void assign(Home home, const FloatVarArgs &x, FloatVarBranch vars, FloatAssign vals, FloatBranchFilter bf=nullptr, FloatVarValPrint vvp=nullptr)
Assign all x with variable selection vars and value selection vals.
Definition branch.cpp:111
Gecode::branch
void branch(Home home, const FloatVarArgs &x, FloatVarBranch vars, FloatValBranch vals, FloatBranchFilter bf=nullptr, FloatVarValPrint vvp=nullptr)
Branch over x with variable selection vars and value selection vals.
Definition branch.cpp:39
Gecode::Float
Floating point numbers.
Gecode::Int::Branch::viewsel
ViewSel< IntView > * viewsel(Space &home, const IntVarBranch &ivb)
Return view selectors for integer views.
Definition view-sel.cpp:39
Gecode::Int::Branch::valselcommit
ValSelCommitBase< IntView, int > * valselcommit(Space &home, const IntValBranch &ivb)
Return value and commit for integer views.
Definition val-sel-commit.cpp:39
Gecode
Gecode toplevel namespace
Gecode::FloatVarValPrint
std::function< void(const Space &home, const Brancher &b, unsigned int a, FloatVar x, int i, const FloatNumBranch &n, std::ostream &o)> FloatVarValPrint
Function type for explaining branching alternatives for float variables.
Definition float.hh:1657
Gecode::postviewvalbrancher
void postviewvalbrancher(Home home, ViewArray< View > &x, ViewSel< View > *vs[n], ValSelCommitBase< View, Val > *vsc, BranchFilter< typename View::VarType > bf, VarValPrint< typename View::VarType, Val > vvp)
Post view value brancher.
Definition view-val.hpp:341
Gecode::FLOAT_VAR_NONE
FloatVarBranch FLOAT_VAR_NONE(void)
Select first unassigned variable.
Definition var.hpp:97