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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
34namespace Gecode { namespace Int {
35
36 template<class IntType>
38 ceil_div_pp(IntType x, IntType y) {
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>
48 forceinline IntType
49 floor_div_pp(IntType x, IntType y) {
50 assert((x >= 0) && (y >= 0));
51 return x / y;
52 }
53
54 template<class IntType>
55 forceinline IntType
56 ceil_div_px(IntType x, IntType y) {
57 assert(x >= 0);
58 return (y >= 0) ? ceil_div_pp(x,y) : -floor_div_pp(x,-y);
59 }
60 template<class IntType>
61 forceinline IntType
62 floor_div_px(IntType x, IntType y) {
63 assert(x >= 0);
64 return (y >= 0) ? floor_div_pp(x,y) : -ceil_div_pp(x,-y);
65 }
66
67 template<class IntType>
68 forceinline IntType
69 ceil_div_xp(IntType x, IntType y) {
70 assert(y >= 0);
71 return (x >= 0) ? ceil_div_pp(x,y) : -floor_div_pp(-x,y);
72 }
73 template<class IntType>
74 forceinline IntType
75 floor_div_xp(IntType x, IntType y) {
76 assert(y >= 0);
77 return (x >= 0) ? floor_div_pp(x,y) : -ceil_div_pp(-x,y);
78 }
79
80 template<class IntType>
81 forceinline IntType
82 ceil_div_xx(IntType x, IntType y) {
83 return (x >= 0) ? ceil_div_px(x,y) : -floor_div_px(-x,y);
84 }
85 template<class IntType>
86 forceinline IntType
87 floor_div_xx(IntType x, IntType y) {
88 return (x >= 0) ? floor_div_px(x,y) : -ceil_div_px(-x,y);
89 }
90
91}}
92
93// STATISTICS: int-prop
94
Finite domain integers.
IntType ceil_div_pp(IntType x, IntType y)
Compute where x and y are non-negative.
Definition div.hpp:38
IntType ceil_div_xp(IntType x, IntType y)
Compute where y is non-negative.
Definition div.hpp:69
IntType floor_div_xp(IntType x, IntType y)
Compute where y is non-negative.
Definition div.hpp:75
IntType floor_div_xx(IntType x, IntType y)
Compute .
Definition div.hpp:87
IntType ceil_div_px(IntType x, IntType y)
Compute where x is non-negative.
Definition div.hpp:56
IntType floor_div_pp(IntType x, IntType y)
Compute where x and y are non-negative.
Definition div.hpp:49
IntType ceil_div_xx(IntType x, IntType y)
Compute .
Definition div.hpp:82
IntType floor_div_px(IntType x, IntType y)
Compute where x is non-negative.
Definition div.hpp:62
IntType
Description of integer types.
Definition int-type.hpp:39
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar y
Definition set.hh:773
Post propagator for SetVar x
Definition set.hh:773
#define forceinline
Definition config.hpp:194