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gecode
int
count
int-eq.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Christian Schulte <schulte@gecode.org>
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*
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* Copyright:
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* Christian Schulte, 2006
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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namespace
Gecode
{
namespace
Int {
namespace
Count {
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template
<
class
VX,
class
VY>
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forceinline
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EqInt<VX,VY>::EqInt
(
Home
home,
ViewArray<VX>
&
x
,
int
n_s, VY
y
,
int
c
)
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:
IntBase
<VX,VY>(home,
x
,n_s,
y
,
c
) {}
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template
<
class
VX,
class
VY>
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ExecStatus
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EqInt<VX,VY>::post
(
Home
home,
ViewArray<VX>
&
x
, VY
y
,
int
c
) {
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// Eliminate decided views
45
int
n_x =
x
.size();
46
for
(
int
i
=n_x;
i
--; )
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switch
(
holds
(
x
[
i
],
y
)) {
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case
RT_FALSE
:
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x
[
i
] =
x
[--n_x];
break
;
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case
RT_TRUE
:
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x
[
i
] =
x
[--n_x];
c
--;
break
;
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case
RT_MAYBE
:
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break
;
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default
:
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GECODE_NEVER
;
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}
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x
.size(n_x);
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// RHS too small or too large
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if
((
c
< 0) || (
c
> n_x))
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return
ES_FAILED
;
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// All views must be different
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if
(
c
== 0)
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return
post_false
(home,
x
,
y
);
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// All views must be equal
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if
(
c
== n_x)
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return
post_true
(home,
x
,
y
);
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// Compute how many subscriptions must be created
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int
n_s =
std::max
(
c
,n_x-
c
)+1;
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assert(n_s <= n_x);
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(void)
new
(home)
EqInt<VX,VY>
(home,
x
,n_s,
y
,
c
);
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return
ES_OK
;
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}
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template
<
class
VX,
class
VY>
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forceinline
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EqInt<VX,VY>::EqInt
(
Space
& home,
EqInt<VX,VY>
&
p
)
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:
IntBase
<VX,VY>(home,
p
) {}
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template
<
class
VX,
class
VY>
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Actor
*
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EqInt<VX,VY>::copy
(
Space
& home) {
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return
new
(home)
EqInt<VX,VY>
(home,*
this
);
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}
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template
<
class
VX,
class
VY>
86
ExecStatus
87
EqInt<VX,VY>::propagate
(
Space
& home,
const
ModEventDelta
&) {
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// Eliminate decided views from subscribed views
89
int
n_x =
x
.size();
90
for
(
int
i
=n_s;
i
--; )
91
switch
(
holds
(
x
[
i
],
y
)) {
92
case
RT_FALSE
:
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x
[
i
].cancel(home,*
this
,
PC_INT_DOM
);
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x
[
i
]=
x
[--n_s];
x
[n_s]=
x
[--n_x];
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break
;
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case
RT_TRUE
:
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x
[
i
].cancel(home,*
this
,
PC_INT_DOM
);
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x
[
i
]=
x
[--n_s];
x
[n_s]=
x
[--n_x];
c
--;
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break
;
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case
RT_MAYBE
:
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break
;
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default
:
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GECODE_NEVER
;
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}
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x
.size(n_x);
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if
((
c
< 0) || (
c
> n_x))
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return
ES_FAILED
;
108
// Eliminate decided views from unsubscribed views
109
for
(
int
i
=n_x;
i
-- > n_s; )
110
switch
(
holds
(
x
[
i
],
y
)) {
111
case
RT_FALSE
:
x
[
i
]=
x
[--n_x];
break
;
112
case
RT_TRUE
:
x
[
i
]=
x
[--n_x];
c
--;
break
;
113
case
RT_MAYBE
:
break
;
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default
:
GECODE_NEVER
;
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}
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x
.size(n_x);
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if
((
c
< 0) || (
c
> n_x))
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return
ES_FAILED
;
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if
(
c
== 0) {
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// All views must be different
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GECODE_ES_CHECK
(
post_false
(home,
x
,
y
));
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return
home.
ES_SUBSUMED
(*
this
);
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}
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if
(
c
== n_x) {
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// All views must be equal
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GECODE_ES_CHECK
(
post_true
(home,
x
,
y
));
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return
home.
ES_SUBSUMED
(*
this
);
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}
129
int
m =
std::max
(
c
,n_x-
c
)+1;
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assert(m <= n_x);
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// Now, there must be new subscriptions from x[n_s] up to x[m-1]
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while
(n_s < m)
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x
[n_s++].subscribe(home,*
this
,
PC_INT_DOM
,
false
);
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return
ES_FIX
;
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}
136
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}}}
138
139
// STATISTICS: int-prop
Gecode::Int::Count::EqInt::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition:
int-eq.hpp:87
Gecode::x
Post propagator for SetVar x
Definition:
set.hh:767
Gecode::y
Post propagator for SetVar SetOpType SetVar y
Definition:
set.hh:767
Gecode::Space::ES_SUBSUMED
ExecStatus ES_SUBSUMED(Propagator &p)
Definition:
core.hpp:3563
Gecode::Int::Count::post_false
ExecStatus post_false(Home home, VX x, ConstIntView y)
Definition:
rel.hpp:194
Gecode::Space
Computation spaces.
Definition:
core.hpp:1742
Gecode::Int::Count::EqInt
Propagator for counting views (equal integer to number of equal views)
Definition:
count.hh:172
Gecode::Actor
Base-class for both propagators and branchers.
Definition:
core.hpp:628
Gecode::Int::RT_TRUE
@ RT_TRUE
Relation does hold.
Definition:
view.hpp:1737
Gecode
Gecode toplevel namespace
Gecode::Int::RT_MAYBE
@ RT_MAYBE
Relation may hold or not.
Definition:
view.hpp:1736
Gecode::Int::Count::IntBase
Baseclass for count propagators (integer)
Definition:
count.hh:138
Gecode::Int::RT_FALSE
@ RT_FALSE
Relation does not hold.
Definition:
view.hpp:1735
GECODE_ES_CHECK
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition:
macros.hpp:91
Gecode::Home
Home class for posting propagators
Definition:
core.hpp:856
Gecode::Int::Count::EqInt::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition:
int-eq.hpp:81
Gecode::Int::Count::post_true
ExecStatus post_true(Home home, VX x, ConstIntView y)
Definition:
rel.hpp:151
Gecode::Int::Count::EqInt::post
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, int c)
Post propagator for .
Definition:
int-eq.hpp:43
GECODE_NEVER
#define GECODE_NEVER
Assert that this command is never executed.
Definition:
macros.hpp:56
Gecode::ES_FIX
@ ES_FIX
Propagation has computed fixpoint.
Definition:
core.hpp:477
forceinline
#define forceinline
Definition:
config.hpp:185
Gecode::Int::Count::holds
RelTest holds(VX x, ConstIntView y)
Test whether x and y are equal.
Definition:
rel.hpp:115
Test::Float::Arithmetic::c
Gecode::FloatVal c(-8, 8)
Gecode::ViewArray< VX >
Gecode::ES_FAILED
@ ES_FAILED
Execution has resulted in failure.
Definition:
core.hpp:474
Gecode::Int::PC_INT_DOM
const Gecode::PropCond PC_INT_DOM
Propagate when domain changes.
Definition:
var-type.hpp:100
Gecode::ModEventDelta
int ModEventDelta
Modification event deltas.
Definition:
core.hpp:89
Test::Int::Basic::i
Gecode::IntArgs i({1, 2, 3, 4})
Gecode::ES_OK
@ ES_OK
Execution is okay.
Definition:
core.hpp:476
p
int p
Number of positive literals for node type.
Definition:
bool-expr.cpp:232
Gecode::Int::Count::EqInt::EqInt
EqInt(Space &home, EqInt &p)
Constructor for cloning p.
Definition:
int-eq.hpp:76
Gecode::Float::Limits::max
const FloatNum max
Largest allowed float value.
Definition:
float.hh:844
Gecode::ExecStatus
ExecStatus
Definition:
core.hpp:472