1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Jip J. Dekker <jip.dekker@monash.edu>
*
* Copyright:
* Jip J. Dekker, 2023
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef __FLATZINC_LASTVAL_HH__
#define __FLATZINC_LASTVAL_HH__
#include <gecode/flatzinc.hh>
#include <gecode/int.hh>
#include <gecode/int/idx-view.hh>
#ifdef GECODE_HAS_SET_VARS
#include <gecode/set.hh>
#include <gecode/set/element.hh>
#endif
#ifdef GECODE_HAS_FLOAT_VARS
#include <gecode/float.hh>
#endif
using namespace Gecode::Int;
#ifdef GECODE_HAS_FLOAT_VARS
namespace Gecode { namespace Int {
/// VarArg type for %Set views
template<>
class ViewToVarArg<Gecode::Float::FloatView> {
public:
typedef Gecode::FloatVarArgs argtype;
};
}}
#endif
namespace Gecode { namespace FlatZinc {
template<class View, class SetLastVal>
class LastVal : public Propagator {
protected:
/// Array of views and their indices
IdxViewArray<View> x;
/// Constructor for cloning \a p
LastVal(Space& home, LastVal& p) : Propagator(home,p) {
x.update(home, p.x);
};
/// Constructor for posting
LastVal(FlatZincSpace& home, IdxViewArray<View> x0) : Propagator(home), x(x0) {
x.subscribe(home, *this, PC_GEN_ASSIGNED);
for (int i = 0; i < x.size(); ++i) {
SetLastVal::init_last_val(home, x[i].idx, x[i].view);
}
}
public:
/// Record (and forget) the values of any assigned views in \a x in the right position in \a last_val.
static void record_assigned(FlatZincSpace& home, IdxViewArray<View>& x) {
int n = x.size();
for (int i = n; i--; ) {
if (x[i].view.assigned()) {
SetLastVal::set_last_val(home, x[i].idx, x[i].view);
x[i] = x[--n];
}
}
x.size(n);
}
/// Copy propagator during cloning
virtual Actor* copy(Space& home){ return new (home) LastVal(home,*this); }
virtual void reschedule(Space &home) {
x.reschedule(home, *this, PC_GEN_ASSIGNED);
}
/// Cost function
virtual PropCost cost(const Space& /* home */, const ModEventDelta& /* med */) const { return PropCost::record(); }
/// Perform propagation
virtual ExecStatus propagate(Space& home, const ModEventDelta& /* med */) {
record_assigned(static_cast<FlatZincSpace&>(home), x);
if (x.size() == 0) {
return home.ES_SUBSUMED(*this);
} else {
return ES_FIX;
}
}
/// Post propagator
static ExecStatus post(FlatZincSpace& home, const typename ViewToVarArg<View>::argtype& x) {
IdxViewArray<View> ix(home, x);
record_assigned(home, ix);
if (ix.size() > 0) {
(void) new (home) LastVal(home, ix);
}
return ES_OK;
}
};
class SetIntLastVal {
public:
static void init_last_val(FlatZincSpace& home, size_t idx, IntView& var) {
home.restart_data().last_val_int[idx] = var.min();
}
static void set_last_val(FlatZincSpace& home, size_t idx, IntView& var) {
home.restart_data().last_val_int[idx] = var.val();
}
};
typedef LastVal<IntView, SetIntLastVal> LastValInt;
class SetBoolLastVal {
public:
static void init_last_val(FlatZincSpace& home, size_t idx, BoolView& var) {
home.restart_data().last_val_bool[idx] = var.min();
}
static void set_last_val(FlatZincSpace& home, size_t idx, BoolView& var) {
home.restart_data().last_val_bool[idx] = var.val();
}
};
typedef LastVal<BoolView, SetBoolLastVal> LastValBool;
#ifdef GECODE_HAS_FLOAT_VARS
class SetFloatLastVal {
public:
static void init_last_val(FlatZincSpace& home, size_t idx, Float::FloatView& var) {
home.restart_data().last_val_float[idx] = var.min();
}
static void set_last_val(FlatZincSpace& home, size_t idx, Float::FloatView& var) {
home.restart_data().last_val_float[idx] = var.val();
}
};
typedef LastVal<Float::FloatView, SetFloatLastVal> LastValFloat;
#endif
#ifdef GECODE_HAS_SET_VARS
class SetIntSetLastVal {
public:
static void init_last_val(FlatZincSpace& home, size_t idx, Set::SetView& var) {
Set::GlbRanges<Set::SetView> lb(var);
home.restart_data().last_val_set[idx] = IntSet(lb);
}
static void set_last_val(FlatZincSpace& home, size_t idx, Set::SetView& var) {
Set::GlbRanges<Set::SetView> lb(var);
home.restart_data().last_val_set[idx] = IntSet(lb);
}
};
typedef LastVal<Set::SetView, SetIntSetLastVal> LastValSet;
#endif
}}
#endif //__FLATZINC_LASTVAL_HH__
|
