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branch.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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6  * Copyright:
7  * Christian Schulte, 2012
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33 
34 #include <gecode/set/branch.hh>
35 
36 namespace Gecode {
37 
38  void
39  branch(Home home, const SetVarArgs& x,
40  SetVarBranch vars, SetValBranch vals,
41  SetBranchFilter bf,
42  SetVarValPrint vvp) {
43  using namespace Set;
44  if (home.failed()) return;
45  vars.expand(home,x);
46  ViewArray<SetView> xv(home,x);
47  ViewSel<SetView>* vs[1] = {
48  Branch::viewsel(home,vars)
49  };
50  postviewvalbrancher<SetView,1,int,2>
51  (home,xv,vs,Branch::valselcommit(home,vals),bf,vvp);
52  }
53 
54  void
55  branch(Home home, const SetVarArgs& x,
57  SetBranchFilter bf,
58  SetVarValPrint vvp) {
59  using namespace Set;
60  if (home.failed()) return;
61  vars.a.expand(home,x);
62  if ((vars.a.select() == SetVarBranch::SEL_NONE) ||
63  (vars.a.select() == SetVarBranch::SEL_RND))
64  vars.b = SET_VAR_NONE();
65  vars.b.expand(home,x);
66  if ((vars.b.select() == SetVarBranch::SEL_NONE) ||
67  (vars.b.select() == SetVarBranch::SEL_RND))
68  vars.c = SET_VAR_NONE();
69  vars.c.expand(home,x);
70  if ((vars.c.select() == SetVarBranch::SEL_NONE) ||
71  (vars.c.select() == SetVarBranch::SEL_RND))
72  vars.d = SET_VAR_NONE();
73  vars.d.expand(home,x);
74  if (vars.b.select() == SetVarBranch::SEL_NONE) {
75  branch(home,x,vars.a,vals,bf,vvp);
76  } else {
77  ViewArray<SetView> xv(home,x);
79  if (vars.c.select() == SetVarBranch::SEL_NONE) {
80  ViewSel<SetView>* vs[2] = {
81  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b)
82  };
83  postviewvalbrancher<SetView,2,int,2>(home,xv,vs,vsc,bf,vvp);
84  } else if (vars.d.select() == SetVarBranch::SEL_NONE) {
85  ViewSel<SetView>* vs[3] = {
86  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
87  Branch::viewsel(home,vars.c)
88  };
89  postviewvalbrancher<SetView,3,int,2>(home,xv,vs,vsc,bf,vvp);
90  } else {
91  ViewSel<SetView>* vs[4] = {
92  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
93  Branch::viewsel(home,vars.c),Branch::viewsel(home,vars.d)
94  };
95  postviewvalbrancher<SetView,4,int,2>(home,xv,vs,vsc,bf,vvp);
96  }
97  }
98  }
99 
100  void
101  branch(Home home, SetVar x, SetValBranch vals, SetVarValPrint vvp) {
102  SetVarArgs xv(1); xv[0]=x;
103  branch(home, xv, SET_VAR_NONE(), vals, nullptr, vvp);
104  }
105 
106 
107  void
108  assign(Home home, const SetVarArgs& x,
109  SetVarBranch vars, SetAssign vals,
110  SetBranchFilter bf,
111  SetVarValPrint vvp) {
112  using namespace Set;
113  if (home.failed()) return;
114  ViewArray<SetView> xv(home,x);
115  ViewSel<SetView>* vs[1] = {
116  new (home) ViewSelNone<SetView>(home,vars)
117  };
118  postviewvalbrancher<SetView,1,int,1>
119  (home,xv,vs,Branch::valselcommit(home,vals),bf,vvp);
120  }
121 
122  void
123  assign(Home home, const SetVarArgs& x,
125  SetBranchFilter bf,
126  SetVarValPrint vvp) {
127  using namespace Set;
128  if (home.failed()) return;
129  vars.a.expand(home,x);
130  if ((vars.a.select() == SetVarBranch::SEL_NONE) ||
131  (vars.a.select() == SetVarBranch::SEL_RND))
132  vars.b = SET_VAR_NONE();
133  vars.b.expand(home,x);
134  if ((vars.b.select() == SetVarBranch::SEL_NONE) ||
135  (vars.b.select() == SetVarBranch::SEL_RND))
136  vars.c = SET_VAR_NONE();
137  vars.c.expand(home,x);
138  if ((vars.c.select() == SetVarBranch::SEL_NONE) ||
139  (vars.c.select() == SetVarBranch::SEL_RND))
140  vars.d = SET_VAR_NONE();
141  vars.d.expand(home,x);
142  if (vars.b.select() == SetVarBranch::SEL_NONE) {
143  assign(home,x,vars.a,vals,bf,vvp);
144  } else {
145  ViewArray<SetView> xv(home,x);
147  if (vars.c.select() == SetVarBranch::SEL_NONE) {
148  ViewSel<SetView>* vs[2] = {
149  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b)
150  };
151  postviewvalbrancher<SetView,2,int,1>(home,xv,vs,vsc,bf,vvp);
152  } else if (vars.d.select() == SetVarBranch::SEL_NONE) {
153  ViewSel<SetView>* vs[3] = {
154  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
155  Branch::viewsel(home,vars.c)
156  };
157  postviewvalbrancher<SetView,3,int,1>(home,xv,vs,vsc,bf,vvp);
158  } else {
159  ViewSel<SetView>* vs[4] = {
160  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
161  Branch::viewsel(home,vars.c),Branch::viewsel(home,vars.d)
162  };
163  postviewvalbrancher<SetView,4,int,1>(home,xv,vs,vsc,bf,vvp);
164  }
165  }
166  }
167 
168  void
169  assign(Home home, SetVar x, SetAssign vars, SetVarValPrint vvp) {
170  SetVarArgs xv(1); xv[0]=x;
171  assign(home, xv, SET_VAR_NONE(), vars, nullptr, vvp);
172  }
173 
174 }
175 
176 // STATISTICS: set-post
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:249
Home class for posting propagators
Definition: core.hpp:856
bool failed(void) const
Check whether corresponding space is failed.
Definition: core.hpp:4048
Which value to select for assignment.
Definition: set.hh:1517
Which values to select for branching first.
Definition: set.hh:1447
Passing set variables.
Definition: set.hh:488
Which variable to select for branching.
Definition: set.hh:1296
Expand and CHB void expand(Home home, const SetVarArgs &x)
Definition: var.hpp:74
@ SEL_NONE
First unassigned.
Definition: set.hh:1300
@ SEL_RND
Random (uniform, for tie breaking)
Definition: set.hh:1301
Set variables
Definition: set.hh:127
Combine variable selection criteria for tie-breaking.
Definition: tiebreak.hpp:38
VarBranch b
Definition: tiebreak.hpp:41
VarBranch a
Branching criteria to try in order.
Definition: tiebreak.hpp:41
VarBranch c
Definition: tiebreak.hpp:41
VarBranch d
Definition: tiebreak.hpp:41
Base class for value selection and commit.
View arrays.
Definition: array.hpp:253
Select the first unassigned view.
Definition: view-sel.hpp:109
Abstract class for view selection.
Definition: view-sel.hpp:44
void branch(Home home, SetVar x, SetValBranch vals, SetVarValPrint vvp)
Branch over x with value selection vals.
Definition: branch.cpp:101
std::function< bool(const Space &home, SetVar x, int i)> SetBranchFilter
Branch filter function type for set variables.
Definition: set.hh:1083
void assign(Home home, SetVar x, SetAssign vars, SetVarValPrint vvp)
Assign x with value selection vals.
Definition: branch.cpp:169
ValSelCommitBase< SetView, int > * valselcommit(Space &home, const SetValBranch &svb)
Return value and commit for set views.
ViewSel< SetView > * viewsel(Space &home, const SetVarBranch &svb)
Return view selectors for set views.
Definition: view-sel.cpp:39
SetVarBranch SET_VAR_NONE(void)
Definition: var.hpp:96