min-max.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
* Vincent Barichard <Vincent.Barichard@univ-angers.fr>
*
* Copyright:
* Christian Schulte, 2004
* Vincent Barichard, 2012
*
* 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.
*
*/
#include <cmath>
namespace Gecode { namespace Float { namespace Arithmetic {
/*
* Bounds consistent min propagator
*
*/
template<class A, class B, class C>
forceinline
Min<A,B,C>::Min(Home home, A x0, B x1, C x2)
: MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,x0,x1,x2) {}
template<class A, class B, class C>
forceinline
Min<A,B,C>::Min(Space& home, Min<A,B,C>& p)
: MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,p) {}
template<class A, class B, class C>
forceinline
Min<A,B,C>::Min(Space& home, Propagator& p,
A x0, B x1, C x2)
: MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,p,x0,x1,x2) {}
template<class A, class B, class C>
Actor*
Min<A,B,C>::copy(Space& home) {
return new (home) Min<A,B,C>(home,*this);
}
template<class A, class B, class C>
ExecStatus
Min<A,B,C>::post(Home home, A x0, B x1, C x2) {
GECODE_ME_CHECK(x2.eq(home,min(x0.domain(),x1.domain())));
GECODE_ME_CHECK(x0.gq(home,x2.min()));
GECODE_ME_CHECK(x1.gq(home,x2.min()));
(void) new (home) Min<A,B,C>(home,x0,x1,x2);
return ES_OK;
}
template<class A, class B, class C>
ExecStatus
Min<A,B,C>::propagate(Space& home, const ModEventDelta&) {
GECODE_ME_CHECK(x2.eq(home,min(x0.domain(),x1.domain())));
GECODE_ME_CHECK(x0.gq(home,x2.min()));
GECODE_ME_CHECK(x1.gq(home,x2.min()));
if (x0 == x1) {
GECODE_ME_CHECK(x0.lq(home,x2.max()));
} else {
if (!overlap(x1.val(),x2.val())) GECODE_ME_CHECK(x0.lq(home,x2.max()));
if (!overlap(x0.val(),x2.val())) GECODE_ME_CHECK(x1.lq(home,x2.max()));
}
return (x0.assigned() && x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
}
/*
* Bounds consistent max propagator
*
*/
template<class A, class B, class C>
forceinline
Max<A,B,C>::Max(Home home, A x0, B x1, C x2)
: MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,x0,x1,x2) {}
template<class A, class B, class C>
forceinline
Max<A,B,C>::Max(Space& home, Max<A,B,C>& p)
: MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,p) {}
template<class A, class B, class C>
forceinline
Max<A,B,C>::Max(Space& home, Propagator& p,
A x0, B x1, C x2)
: MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,p,x0,x1,x2) {}
template<class A, class B, class C>
Actor*
Max<A,B,C>::copy(Space& home) {
return new (home) Max<A,B,C>(home,*this);
}
template<class A, class B, class C>
ExecStatus
Max<A,B,C>::post(Home home, A x0, B x1, C x2) {
GECODE_ME_CHECK(x2.eq(home,max(x0.domain(),x1.domain())));
GECODE_ME_CHECK(x0.lq(home,x2.max()));
GECODE_ME_CHECK(x1.lq(home,x2.max()));
(void) new (home) Max<A,B,C>(home,x0,x1,x2);
return ES_OK;
}
template<class A, class B, class C>
ExecStatus
Max<A,B,C>::propagate(Space& home, const ModEventDelta&) {
GECODE_ME_CHECK(x2.eq(home,max(x0.domain(),x1.domain())));
GECODE_ME_CHECK(x0.lq(home,x2.max()));
GECODE_ME_CHECK(x1.lq(home,x2.max()));
if (x0 == x1) {
GECODE_ME_CHECK(x0.gq(home,x2.min()));
} else {
if (!overlap(x1.val(),x2.val())) GECODE_ME_CHECK(x0.gq(home,x2.min()));
if (!overlap(x0.val(),x2.val())) GECODE_ME_CHECK(x1.gq(home,x2.min()));
}
return (x0.assigned() && x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
}
/*
* Nary bounds consistent maximum
*
*/
template<class View>
forceinline
NaryMax<View>::NaryMax(Home home, ViewArray<View>& x, View y)
: NaryOnePropagator<View,PC_FLOAT_BND>(home,x,y) {}
template<class View>
ExecStatus
NaryMax<View>::post(Home home, ViewArray<View>& x, View y) {
assert(x.size() > 0);
x.unique();
if (x.size() == 1)
return Rel::Eq<View,View>::post(home,x[0],y);
if (x.size() == 2)
return Max<View,View,View>::post(home,x[0],x[1],y);
FloatNum l = Float::Limits::min;
FloatNum u = Float::Limits::min;
for (int i=x.size(); i--; ) {
l = std::max(l,x[i].min());
u = std::max(u,x[i].max());
}
GECODE_ME_CHECK(y.gq(home,l));
GECODE_ME_CHECK(y.lq(home,u));
if (x.same(y)) {
// Check whether y occurs in x
for (int i=x.size(); i--; )
GECODE_ES_CHECK((Rel::Lq<View>::post(home,x[i],y)));
} else {
(void) new (home) NaryMax<View>(home,x,y);
}
return ES_OK;
}
template<class View>
forceinline
NaryMax<View>::NaryMax(Space& home, NaryMax<View>& p)
: NaryOnePropagator<View,PC_FLOAT_BND>(home,p) {}
template<class View>
Actor*
NaryMax<View>::copy(Space& home) {
if (x.size() == 1)
return new (home) Rel::Eq<View,View>(home,*this,x[0],y);
if (x.size() == 2)
return new (home) Max<View,View,View>(home,*this,x[0],x[1],y);
return new (home) NaryMax<View>(home,*this);
}
enum MaxPropStatus {
MPS_ASSIGNED = 1<<0,
MPS_REMOVED = 1<<1,
MPS_NEW_BOUND = 1<<2
};
template<class View>
forceinline ExecStatus
prop_nary_max(Space& home, Propagator& p,
ViewArray<View>& x, View y, PropCond pc) {
rerun:
assert(x.size() > 0);
FloatNum maxmax = x[x.size()-1].max();
FloatNum maxmin = x[x.size()-1].min();
for (int i = x.size()-1; i--; ) {
maxmax = std::max(x[i].max(),maxmax);
maxmin = std::max(x[i].min(),maxmin);
}
GECODE_ME_CHECK(y.lq(home,maxmax));
GECODE_ME_CHECK(y.gq(home,maxmin));
maxmin = y.min();
maxmax = y.max();
int status = MPS_ASSIGNED;
for (int i = x.size(); i--; ) {
ModEvent me = x[i].lq(home,maxmax);
if (me == ME_FLOAT_FAILED)
return ES_FAILED;
if (me_modified(me) && (x[i].max() != maxmax))
status |= MPS_NEW_BOUND;
if (x[i].max() < maxmin) {
x.move_lst(i,home,p,pc);
status |= MPS_REMOVED;
} else if (!x[i].assigned())
status &= ~MPS_ASSIGNED;
}
if (x.size() == 0)
return ES_FAILED;
if ((status & MPS_REMOVED) != 0)
goto rerun;
if (((status & MPS_ASSIGNED) != 0) && y.assigned())
return home.ES_SUBSUMED(p);
return ((status & MPS_NEW_BOUND) != 0) ? ES_NOFIX : ES_FIX;
}
template<class View>
ExecStatus
NaryMax<View>::propagate(Space& home, const ModEventDelta&) {
return prop_nary_max(home,*this,x,y,PC_FLOAT_BND);
}
}}}
// STATISTICS: float-prop
Gecode::Actor
Base-class for both propagators and branchers.
Definition core.hpp:628
Gecode::Float::Arithmetic::Max
Propagator for bounds consistent max operator
Definition arithmetic.hh:356
Gecode::Float::Arithmetic::Max::post
static ExecStatus post(Home home, A x0, B x1, C x2)
Post propagator for .
Definition min-max.hpp:120
Gecode::Float::Arithmetic::Max::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition min-max.hpp:114
Gecode::Float::Arithmetic::Max::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition min-max.hpp:130
Gecode::Float::Arithmetic::Max::Max
Max(Space &home, Max &p)
Constructor for cloning p.
Definition min-max.hpp:103
Gecode::Float::Arithmetic::Min::Min
Min(Space &home, Min &p)
Constructor for cloning p.
Definition min-max.hpp:51
Gecode::Float::Arithmetic::Min::post
static ExecStatus post(Home home, A x0, B x1, C x2)
Post propagator for .
Definition min-max.hpp:68
Gecode::Float::Arithmetic::Min::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition min-max.hpp:62
Gecode::Float::Arithmetic::Min::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition min-max.hpp:78
Gecode::Float::Arithmetic::NaryMax
Bounds consistent n-ary maximum propagator.
Definition arithmetic.hh:383
Gecode::Float::Arithmetic::NaryMax::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition min-max.hpp:187
Gecode::Float::Arithmetic::NaryMax::post
static ExecStatus post(Home home, ViewArray< View > &x, View y)
Post propagator .
Definition min-max.hpp:155
Gecode::Float::Arithmetic::NaryMax::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition min-max.hpp:242
Gecode::Float::Arithmetic::NaryMax::NaryMax
NaryMax(Space &home, NaryMax &p)
Constructor for cloning p.
Gecode::Float::Rel::Eq
Binary bounds consistent equality propagator.
Definition rel.hh:67
Gecode::Float::Rel::Eq::post
static ExecStatus post(Home home, View0 x0, View1 x1)
Post bounds consistent propagator .
Definition eq.hpp:50
Gecode::Float::Rel::Lq::post
static ExecStatus post(Home home, View x0, View x1)
Post propagator .
Definition lq-le.hpp:52
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::MixTernaryPropagator< A, PC_FLOAT_BND, B, PC_FLOAT_BND, C, PC_FLOAT_BND >::x0
A x0
Definition pattern.hpp:240
Gecode::MixTernaryPropagator< A, PC_FLOAT_BND, B, PC_FLOAT_BND, C, PC_FLOAT_BND >::x1
B x1
Definition pattern.hpp:242
Gecode::MixTernaryPropagator< A, PC_FLOAT_BND, B, PC_FLOAT_BND, C, PC_FLOAT_BND >::x2
C x2
Definition pattern.hpp:244
Gecode::MixTernaryPropagator< A, PC_FLOAT_BND, B, PC_FLOAT_BND, C, PC_FLOAT_BND >::MixTernaryPropagator
MixTernaryPropagator(Space &home, MixTernaryPropagator &p)
Definition pattern.hpp:661
Gecode::NaryOnePropagator
(n+1)-ary propagator
Definition pattern.hpp:172
Gecode::NaryOnePropagator< View, PC_FLOAT_BND >::x
ViewArray< View > x
Definition pattern.hpp:175
Gecode::NaryOnePropagator< View, PC_FLOAT_BND >::NaryOnePropagator
NaryOnePropagator(Space &home, NaryOnePropagator &p)
Gecode::NaryOnePropagator< View, PC_FLOAT_BND >::y
View y
Definition pattern.hpp:177
Gecode::Propagator
Base-class for propagators.
Definition core.hpp:1064
Gecode::Propagator::Space
friend class Space
Definition core.hpp:1066
Gecode::Propagator::Propagator
Propagator(Home home)
Constructor for posting.
Definition core.hpp:3498
Gecode::Space
Computation spaces.
Definition core.hpp:1742
Gecode::View
Gecode::ViewArray
View arrays.
Definition array.hpp:253
Gecode::ViewArray::move_lst
void move_lst(int i)
Move view from position size()-1 to position i (truncate array by one).
Definition array.hpp:1236
Gecode::ViewArray::size
int size(void) const
Return size of array (number of elements).
Definition array.hpp:1156
Gecode::Space::ES_SUBSUMED
ExecStatus ES_SUBSUMED(Propagator &p)
Definition core.hpp:3563
Gecode::ModEventDelta
int ModEventDelta
Modification event deltas.
Definition core.hpp:89
GECODE_ME_CHECK
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition macros.hpp:52
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::me_modified
bool me_modified(ModEvent me)
Check whether modification event me describes variable modification.
Definition modevent.hpp:59
Gecode::FloatNum
double FloatNum
Floating point number base type.
Definition float.hh:106
Gecode::Float::Arithmetic
Arithmetic propagators
Gecode::Float::Arithmetic::MaxPropStatus
MaxPropStatus
Status of propagation for nary max.
Definition min-max.hpp:196
Gecode::Float::Arithmetic::MPS_ASSIGNED
@ MPS_ASSIGNED
All views are assigned.
Definition min-max.hpp:197
Gecode::Float::Arithmetic::MPS_NEW_BOUND
@ MPS_NEW_BOUND
Telling has found a new upper bound.
Definition min-max.hpp:199
Gecode::Float::Arithmetic::MPS_REMOVED
@ MPS_REMOVED
A view is removed.
Definition min-max.hpp:198
Gecode::Float::Arithmetic::prop_nary_max
ExecStatus prop_nary_max(Space &home, Propagator &p, ViewArray< View > &x, View y, PropCond pc)
Definition min-max.hpp:204
Gecode::Float::Limits::min
const FloatNum min
Smallest allowed float value.
Definition float.hh:846
Gecode::Float
Floating point numbers.
Gecode::Float::overlap
bool overlap(const FloatVal &x, const FloatVal &y)
Definition val.hpp:498
Gecode::Float::ME_FLOAT_FAILED
const Gecode::ModEvent ME_FLOAT_FAILED
Domain operation has resulted in failure.
Definition var-type.hpp:260
Gecode::Float::PC_FLOAT_BND
const Gecode::PropCond PC_FLOAT_BND
Propagate when minimum or maximum of a view changes.
Definition var-type.hpp:292
Gecode
Gecode toplevel namespace
Gecode::min
void min(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
Definition arithmetic.cpp:67
Gecode::ExecStatus
ExecStatus
Definition core.hpp:472
Gecode::ES_OK
@ ES_OK
Execution is okay.
Definition core.hpp:476
Gecode::ES_FIX
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
Gecode::ES_FAILED
@ ES_FAILED
Execution has resulted in failure.
Definition core.hpp:474
Gecode::ES_NOFIX
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition core.hpp:475
Gecode::max
void max(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
Definition arithmetic.cpp:49
Gecode::PropCond
int PropCond
Type for propagation conditions.
Definition core.hpp:72
Gecode::ModEvent
int ModEvent
Type for modification events.
Definition core.hpp:62
forceinline
#define forceinline
Definition config.hpp:187