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branch.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2012
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10  * $Date: 2013-05-02 17:10:16 +0200 (Thu, 02 May 2013) $ by $Author: schulte $
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37 
38 #include <gecode/set/branch.hh>
39 
40 namespace Gecode {
41  BrancherHandle
42  branch(Home home, const SetVarArgs& x,
43  SetVarBranch vars, SetValBranch vals,
45  using namespace Set;
46  if (home.failed()) return BrancherHandle();
47  vars.expand(home,x);
48  ViewArray<SetView> xv(home,x);
49  ViewSel<SetView>* vs[1] = {
50  Branch::viewsel(home,vars)
51  };
53  (home,xv,vs,Branch::valselcommit(home,vals),bf,vvp);
54  }
55 
56  BrancherHandle
57  branch(Home home, const SetVarArgs& x,
60  using namespace Set;
61  if (home.failed()) return BrancherHandle();
62  vars.a.expand(home,x);
63  if ((vars.a.select() == SetVarBranch::SEL_NONE) ||
64  (vars.a.select() == SetVarBranch::SEL_RND))
65  vars.b = SET_VAR_NONE();
66  vars.b.expand(home,x);
67  if ((vars.b.select() == SetVarBranch::SEL_NONE) ||
68  (vars.b.select() == SetVarBranch::SEL_RND))
69  vars.c = SET_VAR_NONE();
70  vars.c.expand(home,x);
71  if ((vars.c.select() == SetVarBranch::SEL_NONE) ||
72  (vars.c.select() == SetVarBranch::SEL_RND))
73  vars.d = SET_VAR_NONE();
74  vars.d.expand(home,x);
75  if (vars.b.select() == SetVarBranch::SEL_NONE) {
76  return branch(home,x,vars.a,vals,bf,vvp);
77  } else {
78  ViewArray<SetView> xv(home,x);
80  if (vars.c.select() == SetVarBranch::SEL_NONE) {
81  ViewSel<SetView>* vs[2] = {
82  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b)
83  };
84  return ViewValBrancher<SetView,2,int,2>::post(home,xv,vs,vsc,bf,vvp);
85  } else if (vars.d.select() == SetVarBranch::SEL_NONE) {
86  ViewSel<SetView>* vs[3] = {
87  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
88  Branch::viewsel(home,vars.c)
89  };
90  return ViewValBrancher<SetView,3,int,2>::post(home,xv,vs,vsc,bf,vvp);
91  } else {
92  ViewSel<SetView>* vs[4] = {
93  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
94  Branch::viewsel(home,vars.c),Branch::viewsel(home,vars.d)
95  };
96  return ViewValBrancher<SetView,4,int,2>::post(home,xv,vs,vsc,bf,vvp);
97  }
98  }
99  }
100 
101  BrancherHandle
103  SetVarArgs xv(1); xv[0]=x;
104  return branch(home, xv, SET_VAR_NONE(), vals, NULL, vvp);
105  }
106 
107  BrancherHandle
108  assign(Home home, const SetVarArgs& x, SetAssign sa,
110  using namespace Set;
111  if (home.failed()) return BrancherHandle();
112  ViewArray<SetView> xv(home,x);
113  ViewSel<SetView>* vs[1] = {
114  new (home) ViewSelNone<SetView>(home,SET_VAR_NONE())
115  };
117  (home,xv,vs,Branch::valselcommit(home,sa),bf,vvp);
118  }
119 
122  SetVarArgs xv(1); xv[0]=x;
123  return assign(home, xv, sa, NULL, vvp);
124  }
125 
126 }
127 
128 // STATISTICS: set-post