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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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9  * Last modified:
10  * $Date: 2013-02-25 21:43:24 +0100 (Mon, 25 Feb 2013) $ by $Author: schulte $
11  * $Revision: 13406 $
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37 
38 #include <gecode/float/branch.hh>
39 
40 namespace Gecode {
41 
42  BrancherHandle
43  branch(Home home, const FloatVarArgs& x,
45  using namespace Float;
46  if (home.failed()) return BrancherHandle();
47  vars.expand(home,x);
48  ViewArray<FloatView> xv(home,x);
49  ViewSel<FloatView>* vs[1] = {
50  Branch::viewsel(home,vars)
51  };
52  if (vals.select() == FloatValBranch::SEL_SPLIT_RND) {
54  = new (home)
57  (home,xv,vs,vsc,bf);
58  } else {
60  (home,xv,vs,Branch::valselcommit(home,vals),bf);
61  }
62  }
63 
64  BrancherHandle
65  branch(Home home, const FloatVarArgs& x,
67  FloatBranchFilter bf) {
68  using namespace Float;
69  if (home.failed()) return BrancherHandle();
70  vars.a.expand(home,x);
71  if ((vars.a.select() == FloatVarBranch::SEL_NONE) ||
72  (vars.a.select() == FloatVarBranch::SEL_RND))
73  vars.b = FLOAT_VAR_NONE();
74  vars.b.expand(home,x);
75  if ((vars.b.select() == FloatVarBranch::SEL_NONE) ||
76  (vars.b.select() == FloatVarBranch::SEL_RND))
77  vars.c = FLOAT_VAR_NONE();
78  vars.c.expand(home,x);
79  if ((vars.c.select() == FloatVarBranch::SEL_NONE) ||
80  (vars.c.select() == FloatVarBranch::SEL_RND))
81  vars.d = FLOAT_VAR_NONE();
82  vars.d.expand(home,x);
83  if (vars.b.select() == FloatVarBranch::SEL_NONE) {
84  return branch(home,x,vars.a,vals,bf);
85  } else {
86  ViewArray<FloatView> xv(home,x);
87  if (vals.select() == FloatValBranch::SEL_SPLIT_RND) {
89  = new (home)
91  if (vars.c.select() == FloatVarBranch::SEL_NONE) {
92  ViewSel<FloatView>* vs[2] = {
93  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b)
94  };
96  ::post(home,xv,vs,vsc,bf);
97  } else if (vars.d.select() == FloatVarBranch::SEL_NONE) {
98  ViewSel<FloatView>* vs[3] = {
99  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
100  Branch::viewsel(home,vars.c)
101  };
103  ::post(home,xv,vs,vsc,bf);
104  } else {
105  ViewSel<FloatView>* vs[4] = {
106  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
107  Branch::viewsel(home,vars.c),Branch::viewsel(home,vars.d)
108  };
110  ::post(home,xv,vs,vsc,bf);
111  }
112  } else {
114  vsc = Branch::valselcommit(home,vals);
115  if (vars.c.select() == FloatVarBranch::SEL_NONE) {
116  ViewSel<FloatView>* vs[2] = {
117  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b)
118  };
120  ::post(home,xv,vs,vsc,bf);
121  } else if (vars.d.select() == FloatVarBranch::SEL_NONE) {
122  ViewSel<FloatView>* vs[3] = {
123  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
124  Branch::viewsel(home,vars.c)
125  };
127  ::post(home,xv,vs,vsc,bf);
128  } else {
129  ViewSel<FloatView>* vs[4] = {
130  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
131  Branch::viewsel(home,vars.c),Branch::viewsel(home,vars.d)
132  };
134  ::post(home,xv,vs,vsc,bf);
135  }
136  }
137  }
138  }
139 
140  BrancherHandle
142  FloatVarArgs xv(1); xv[0]=x;
143  return branch(home, xv, FLOAT_VAR_NONE(), vals);
144  }
145 
146  BrancherHandle
148  FloatBranchFilter bf) {
149  using namespace Float;
150  if (home.failed()) return BrancherHandle();
151  ViewArray<FloatView> xv(home,x);
152  ViewSel<FloatView>* vs[1] = {
153  new (home) ViewSelNone<FloatView>(home,FLOAT_VAR_NONE())
154  };
155  if (fa.select() == FloatAssign::SEL_RND) {
157  = new (home)
160  (home,xv,vs,vsc,bf);
161  } else {
163  (home,xv,vs,Branch::valselcommit(home,fa),bf);
164  }
165  }
166 
169  FloatVarArgs xv(1); xv[0]=x;
170  return assign(home, xv, fa);
171  }
172 
173 }
174 
175 // STATISTICS: float-post