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div.hpp
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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, 2013
8  *
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33 
34 namespace Gecode { namespace Int {
35 
36  template<class IntType>
39  assert((x >= 0) && (y >= 0));
40  /*
41  * This is smarter than it looks: for many cpus, % and / are
42  * implemented by the same instruction and an optimizing compiler
43  * will generate the instruction only once.
44  */
45  return ((x % y) == 0) ? x/y : (x/y + 1);
46  }
47  template<class IntType>
50  assert((x >= 0) && (y >= 0));
51  return x / y;
52  }
53 
54  template<class IntType>
57  assert(x >= 0);
58  return (y >= 0) ? ceil_div_pp(x,y) : -floor_div_pp(x,-y);
59  }
60  template<class IntType>
63  assert(x >= 0);
64  return (y >= 0) ? floor_div_pp(x,y) : -ceil_div_pp(x,-y);
65  }
66 
67  template<class IntType>
70  assert(y >= 0);
71  return (x >= 0) ? ceil_div_pp(x,y) : -floor_div_pp(-x,y);
72  }
73  template<class IntType>
76  assert(y >= 0);
77  return (x >= 0) ? floor_div_pp(x,y) : -ceil_div_pp(-x,y);
78  }
79 
80  template<class IntType>
83  return (x >= 0) ? ceil_div_px(x,y) : -floor_div_px(-x,y);
84  }
85  template<class IntType>
88  return (x >= 0) ? floor_div_px(x,y) : -ceil_div_px(-x,y);
89  }
90 
91 }}
92 
93 // STATISTICS: int-prop
94 
IntType ceil_div_pp(IntType x, IntType y)
Compute where x and y are non-negative.
Definition: div.hpp:38
IntType floor_div_xx(IntType x, IntType y)
Compute .
Definition: div.hpp:87
#define forceinline
Definition: config.hpp:185
IntType floor_div_pp(IntType x, IntType y)
Compute where x and y are non-negative.
Definition: div.hpp:49
IntType ceil_div_px(IntType x, IntType y)
Compute where x is non-negative.
Definition: div.hpp:56
IntType floor_div_xp(IntType x, IntType y)
Compute where y is non-negative.
Definition: div.hpp:75
IntType ceil_div_xp(IntType x, IntType y)
Compute where y is non-negative.
Definition: div.hpp:69
IntType ceil_div_xx(IntType x, IntType y)
Compute .
Definition: div.hpp:82
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:765
IntType floor_div_px(IntType x, IntType y)
Compute where x is non-negative.
Definition: div.hpp:62
Post propagator for SetVar x
Definition: set.hh:765
Gecode toplevel namespace
IntType
Description of integer types.
Definition: int-type.hpp:39