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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: 2013-05-29 13:53:43 +0200 (Wed, 29 May 2013) $ by $Author: schulte $
11  * $Revision: 13672 $
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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,
44  FloatVarBranch vars, FloatValBranch vals,
46  using namespace Float;
47  if (home.failed()) return BrancherHandle();
48  vars.expand(home,x);
49  ViewArray<FloatView> xv(home,x);
50  ViewSel<FloatView>* vs[1] = {
51  Branch::viewsel(home,vars)
52  };
54  (home,xv,vs,Branch::valselcommit(home,vals),bf,vvp);
55  }
56 
57  BrancherHandle
58  branch(Home home, const FloatVarArgs& x,
61  using namespace Float;
62  if (home.failed()) return BrancherHandle();
63  vars.a.expand(home,x);
64  if ((vars.a.select() == FloatVarBranch::SEL_NONE) ||
65  (vars.a.select() == FloatVarBranch::SEL_RND))
66  vars.b = FLOAT_VAR_NONE();
67  vars.b.expand(home,x);
68  if ((vars.b.select() == FloatVarBranch::SEL_NONE) ||
69  (vars.b.select() == FloatVarBranch::SEL_RND))
70  vars.c = FLOAT_VAR_NONE();
71  vars.c.expand(home,x);
72  if ((vars.c.select() == FloatVarBranch::SEL_NONE) ||
73  (vars.c.select() == FloatVarBranch::SEL_RND))
74  vars.d = FLOAT_VAR_NONE();
75  vars.d.expand(home,x);
76  if (vars.b.select() == FloatVarBranch::SEL_NONE) {
77  return branch(home,x,vars.a,vals,bf,vvp);
78  } else {
79  ViewArray<FloatView> xv(home,x);
81  vsc = Branch::valselcommit(home,vals);
82  if (vars.c.select() == FloatVarBranch::SEL_NONE) {
83  ViewSel<FloatView>* vs[2] = {
84  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b)
85  };
87  ::post(home,xv,vs,vsc,bf,vvp);
88  } else if (vars.d.select() == FloatVarBranch::SEL_NONE) {
89  ViewSel<FloatView>* vs[3] = {
90  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
91  Branch::viewsel(home,vars.c)
92  };
94  ::post(home,xv,vs,vsc,bf,vvp);
95  } else {
96  ViewSel<FloatView>* vs[4] = {
97  Branch::viewsel(home,vars.a),Branch::viewsel(home,vars.b),
98  Branch::viewsel(home,vars.c),Branch::viewsel(home,vars.d)
99  };
101  ::post(home,xv,vs,vsc,bf,vvp);
102  }
103  }
104  }
105 
106  BrancherHandle
108  FloatVarArgs xv(1); xv[0]=x;
109  return branch(home, xv, FLOAT_VAR_NONE(), vals, NULL, vvp);
110  }
111 
112  BrancherHandle
115  using namespace Float;
116  if (home.failed()) return BrancherHandle();
117  ViewArray<FloatView> xv(home,x);
118  ViewSel<FloatView>* vs[1] = {
119  new (home) ViewSelNone<FloatView>(home,FLOAT_VAR_NONE())
120  };
122  (home,xv,vs,Branch::valselcommit(home,fa),bf,vvp);
123  }
124 
127  FloatVarArgs xv(1); xv[0]=x;
128  return assign(home, xv, fa, NULL, vvp);
129  }
130 
131 }
132 
133 // STATISTICS: float-post