eq.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.
*
*/
namespace Gecode { namespace Float { namespace Rel {
/*
* Binary bounds consistent equality
*
*/
template<class View0, class View1>
forceinline
Eq<View0,View1>::Eq(Home home, View0 x0, View1 x1)
: MixBinaryPropagator<View0,PC_FLOAT_BND,View1,PC_FLOAT_BND>(home,x0,x1) {}
template<class View0, class View1>
ExecStatus
Eq<View0,View1>::post(Home home, View0 x0, View1 x1){
if (x0.assigned()) {
GECODE_ME_CHECK(x1.eq(home,x0.val()));
} else if (x1.assigned()) {
GECODE_ME_CHECK(x0.eq(home,x1.val()));
} else if (x0 != x1) {
GECODE_ME_CHECK(x0.lq(home,x1.max()));
GECODE_ME_CHECK(x1.lq(home,x0.max()));
GECODE_ME_CHECK(x0.gq(home,x1.min()));
GECODE_ME_CHECK(x1.gq(home,x0.min()));
(void) new (home) Eq<View0,View1>(home,x0,x1);
}
return ES_OK;
}
template<class View0, class View1>
forceinline
Eq<View0,View1>::Eq(Space& home, Eq<View0,View1>& p)
: MixBinaryPropagator<View0,PC_FLOAT_BND,View1,PC_FLOAT_BND>(home,p) {}
template<class View0, class View1>
forceinline
Eq<View0,View1>::Eq(Space& home, Propagator& p,
View0 x0, View1 x1)
: MixBinaryPropagator<View0,PC_FLOAT_BND,View1,PC_FLOAT_BND>(home,p,
x0,x1) {}
template<class View0, class View1>
Actor*
Eq<View0,View1>::copy(Space& home) {
return new (home) Eq<View0,View1>(home,*this);
}
template<class View0, class View1>
ExecStatus
Eq<View0,View1>::propagate(Space& home, const ModEventDelta&) {
if (x0.assigned()) {
GECODE_ME_CHECK(x1.eq(home,x0.val()));
} else if (x1.assigned()) {
GECODE_ME_CHECK(x0.eq(home,x1.val()));
} else {
do {
GECODE_ME_CHECK(x0.gq(home,x1.min()));
GECODE_ME_CHECK(x1.gq(home,x0.min()));
} while (x0.min() != x1.min());
do {
GECODE_ME_CHECK(x0.lq(home,x1.max()));
GECODE_ME_CHECK(x1.lq(home,x0.max()));
} while (x0.max() != x1.max());
if (!x0.assigned())
return ES_FIX;
}
assert(x0.assigned() && x1.assigned());
return home.ES_SUBSUMED(*this);
}
/*
* Nary bound consistent equality
*
*/
template<class View>
forceinline
NaryEq<View>::NaryEq(Home home, ViewArray<View>& x)
: NaryPropagator<View,PC_FLOAT_BND>(home,x) {}
template<class View>
ExecStatus
NaryEq<View>::post(Home home, ViewArray<View>& x) {
x.unique(home);
if (x.size() == 2) {
return Eq<View,View>::post(home,x[0],x[1]);
} else if (x.size() > 2) {
FloatNum l = x[0].min();
FloatNum u = x[0].max();
for (int i=x.size(); i-- > 1; ) {
l = std::max(l,x[i].min());
u = std::min(u,x[i].max());
}
for (int i=x.size(); i--; ) {
GECODE_ME_CHECK(x[i].gq(home,l));
GECODE_ME_CHECK(x[i].lq(home,u));
}
(void) new (home) NaryEq<View>(home,x);
}
return ES_OK;
}
template<class View>
forceinline
NaryEq<View>::NaryEq(Space& home, NaryEq<View>& p)
: NaryPropagator<View,PC_FLOAT_BND>(home,p) {}
template<class View>
Actor*
NaryEq<View>::copy(Space& home) {
return new (home) NaryEq<View>(home,*this);
}
template<class View>
PropCost
NaryEq<View>::cost(const Space&, const ModEventDelta& med) const {
if (View::me(med) == ME_FLOAT_VAL)
return PropCost::unary(PropCost::LO);
else
return PropCost::linear(PropCost::LO, x.size());
}
template<class View>
ExecStatus
NaryEq<View>::propagate(Space& home, const ModEventDelta& med) {
assert(x.size() > 2);
if (View::me(med) == ME_FLOAT_VAL) {
// One of the variables is assigned
for (int i = 0; ; i++)
if (x[i].assigned()) {
FloatVal n = x[i].val();
x.move_lst(i);
for (int j = x.size(); j--; )
GECODE_ME_CHECK(x[j].eq(home,n));
return home.ES_SUBSUMED(*this);
}
GECODE_NEVER;
}
FloatNum mn = x[0].min();
restart_min:
for (int i = x.size(); i--; ) {
GECODE_ME_CHECK(x[i].gq(home,mn));
if (mn < x[i].min()) {
mn = x[i].min();
goto restart_min;
}
}
FloatNum mx = x[0].max();
restart_max:
for (int i = x.size(); i--; ) {
GECODE_ME_CHECK(x[i].lq(home,mx));
if (mx > x[i].max()) {
mx = x[i].max();
goto restart_max;
}
}
return x[0].assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
}
/*
* Reified bounds consistent equality
*
*/
template<class View, class CtrlView, ReifyMode rm>
forceinline
ReEq<View,CtrlView,rm>::ReEq(Home home, View x0, View x1, CtrlView b)
: Int::ReBinaryPropagator<View,PC_FLOAT_BND,CtrlView>(home,x0,x1,b) {}
template<class View, class CtrlView, ReifyMode rm>
ExecStatus
ReEq<View,CtrlView,rm>::post(Home home, View x0, View x1, CtrlView b){
if (b.one()) {
if (rm == RM_PMI)
return ES_OK;
return Eq<View,View>::post(home,x0,x1);
}
if (b.zero()) {
if (rm == RM_IMP)
return ES_OK;
return Nq<View,View>::post(home,x0,x1);
}
if (x0 != x1) {
(void) new (home) ReEq(home,x0,x1,b);
} else if (rm != RM_IMP) {
GECODE_ME_CHECK(b.one(home));
}
return ES_OK;
}
template<class View, class CtrlView, ReifyMode rm>
forceinline
ReEq<View,CtrlView,rm>::ReEq(Space& home, ReEq& p)
: Int::ReBinaryPropagator<View,PC_FLOAT_BND,CtrlView>(home,p) {}
template<class View, class CtrlView, ReifyMode rm>
Actor*
ReEq<View,CtrlView,rm>::copy(Space& home) {
return new (home) ReEq<View,CtrlView,rm>(home,*this);
}
template<class View, class CtrlView, ReifyMode rm>
ExecStatus
ReEq<View,CtrlView,rm>::propagate(Space& home, const ModEventDelta&) {
if (b.one()) {
if (rm == RM_PMI)
return home.ES_SUBSUMED(*this);
GECODE_REWRITE(*this,(Eq<View,View>::post(home(*this),x0,x1)));
}
if (b.zero()) {
if (rm == RM_IMP)
return home.ES_SUBSUMED(*this);
GECODE_REWRITE(*this,(Nq<View,View>::post(home(*this),x0,x1)));
}
switch (rtest_eq(x0,x1)) {
case RT_TRUE:
if (rm != RM_IMP)
GECODE_ME_CHECK(b.one_none(home));
break;
case RT_FALSE:
if (rm != RM_PMI)
GECODE_ME_CHECK(b.zero_none(home));
break;
case RT_MAYBE:
return ES_FIX;
default: GECODE_NEVER;
}
return home.ES_SUBSUMED(*this);
}
/*
* Reified bounds consistent equality (one variable)
*
*/
template<class View, class CtrlView, ReifyMode rm>
forceinline
ReEqFloat<View,CtrlView,rm>::ReEqFloat
(Home home, View x, FloatVal c0, CtrlView b)
: Int::ReUnaryPropagator<View,PC_FLOAT_BND,CtrlView>(home,x,b), c(c0) {}
template<class View, class CtrlView, ReifyMode rm>
ExecStatus
ReEqFloat<View,CtrlView,rm>::post(Home home, View x, FloatVal c, CtrlView b) {
if (b.one()) {
if (rm != RM_PMI)
GECODE_ME_CHECK(x.eq(home,c));
} else if (x.assigned()) {
if (overlap(x.val(),c)) {
if (rm != RM_IMP)
GECODE_ME_CHECK(b.one(home));
} else {
if (rm != RM_PMI)
GECODE_ME_CHECK(b.zero(home));
}
} else {
(void) new (home) ReEqFloat(home,x,c,b);
}
return ES_OK;
}
template<class View, class CtrlView, ReifyMode rm>
forceinline
ReEqFloat<View,CtrlView,rm>::ReEqFloat(Space& home, ReEqFloat& p)
: Int::ReUnaryPropagator<View,PC_FLOAT_BND,CtrlView>(home,p), c(p.c) {}
template<class View, class CtrlView, ReifyMode rm>
Actor*
ReEqFloat<View,CtrlView,rm>::copy(Space& home) {
return new (home) ReEqFloat<View,CtrlView,rm>(home,*this);
}
template<class View, class CtrlView, ReifyMode rm>
ExecStatus
ReEqFloat<View,CtrlView,rm>::propagate(Space& home, const ModEventDelta&) {
if (b.one()) {
if (rm != RM_PMI)
GECODE_ME_CHECK(x0.eq(home,c));
} else {
switch (rtest_eq(x0,c)) {
case RT_TRUE:
if (rm != RM_IMP)
GECODE_ME_CHECK(b.one(home));
break;
case RT_FALSE:
if (rm != RM_PMI)
GECODE_ME_CHECK(b.zero(home));
break;
case RT_MAYBE:
return ES_FIX;
default: GECODE_NEVER;
}
}
return home.ES_SUBSUMED(*this);
}
}}}
// STATISTICS: float-prop
Gecode::Actor
Base-class for both propagators and branchers.
Definition core.hpp:628
Gecode::FloatVal
Float value type.
Definition float.hh:334
Gecode::Float::Rel::Eq::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition eq.hpp:85
Gecode::Float::Rel::Eq::Eq
Eq(Space &home, Eq< View0, View1 > &p)
Constructor for cloning p.
Definition eq.hpp:67
Gecode::Float::Rel::Eq::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition eq.hpp:79
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::NaryEq::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition eq.hpp:161
Gecode::Float::Rel::NaryEq::NaryEq
NaryEq(Space &home, NaryEq< View > &p)
Constructor for cloning p.
Definition eq.hpp:141
Gecode::Float::Rel::NaryEq::post
static ExecStatus post(Home home, ViewArray< View > &x)
Post bounds consistent propagator .
Definition eq.hpp:119
Gecode::Float::Rel::NaryEq::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition eq.hpp:146
Gecode::Float::Rel::NaryEq::cost
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function.
Definition eq.hpp:152
Gecode::Float::Rel::Nq::post
static ExecStatus post(Home home, View0 x0, View1 x1)
Post bounds consistent propagator .
Definition nq.hpp:49
Gecode::Float::Rel::ReEqFloat::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition eq.hpp:317
Gecode::Float::Rel::ReEqFloat::c
FloatVal c
Float constant to check.
Definition rel.hh:157
Gecode::Float::Rel::ReEqFloat::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition eq.hpp:311
Gecode::Float::Rel::ReEqFloat::post
static ExecStatus post(Home home, View x, FloatVal c, CtrlView b)
Post bounds consistent propagator .
Definition eq.hpp:285
Gecode::Float::Rel::ReEqFloat::ReEqFloat
ReEqFloat(Space &home, ReEqFloat &p)
Constructor for cloning p.
Definition eq.hpp:306
Gecode::Float::Rel::ReEq::ReEq
ReEq(Space &home, ReEq &p)
Constructor for cloning p.
Definition eq.hpp:233
Gecode::Float::Rel::ReEq::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition eq.hpp:238
Gecode::Float::Rel::ReEq::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition eq.hpp:244
Gecode::Float::Rel::ReEq::post
static ExecStatus post(Home home, View x0, View x1, CtrlView b)
Post bounds consistent propagator .
Definition eq.hpp:211
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::Int::ReBinaryPropagator< View, PC_FLOAT_BND, CtrlView >::ReBinaryPropagator
ReBinaryPropagator(Space &home, ReBinaryPropagator &p)
Gecode::Int::ReBinaryPropagator< View, PC_FLOAT_BND, CtrlView >::x0
View x0
Definition propagator.hpp:90
Gecode::Int::ReBinaryPropagator< View, PC_FLOAT_BND, CtrlView >::b
CtrlView b
Definition propagator.hpp:92
Gecode::Int::ReBinaryPropagator< View, PC_FLOAT_BND, CtrlView >::x1
View x1
Definition propagator.hpp:90
Gecode::Int::ReUnaryPropagator< View, PC_FLOAT_BND, CtrlView >::b
CtrlView b
Definition propagator.hpp:59
Gecode::Int::ReUnaryPropagator< View, PC_FLOAT_BND, CtrlView >::ReUnaryPropagator
ReUnaryPropagator(Space &home, ReUnaryPropagator &p)
Gecode::Int::ReUnaryPropagator< View, PC_FLOAT_BND, CtrlView >::x0
View x0
Definition propagator.hpp:57
Gecode::MixBinaryPropagator< View0, PC_FLOAT_BND, View1, PC_FLOAT_BND >::x1
View1 x1
Definition pattern.hpp:209
Gecode::MixBinaryPropagator< View0, PC_FLOAT_BND, View1, PC_FLOAT_BND >::MixBinaryPropagator
MixBinaryPropagator(Space &home, MixBinaryPropagator &p)
Definition pattern.hpp:597
Gecode::MixBinaryPropagator< View0, PC_FLOAT_BND, View1, PC_FLOAT_BND >::x0
View0 x0
Definition pattern.hpp:207
Gecode::NaryPropagator< View, PC_FLOAT_BND >::x
ViewArray< View > x
Definition pattern.hpp:145
Gecode::NaryPropagator< View, PC_FLOAT_BND >::NaryPropagator
NaryPropagator(Space &home, NaryPropagator &p)
Gecode::PropCost
Propagation cost.
Definition core.hpp:486
Gecode::PropCost::unary
static PropCost unary(PropCost::Mod m)
Single variable for modifier pcm.
Definition core.hpp:4813
Gecode::PropCost::linear
static PropCost linear(PropCost::Mod m, unsigned int n)
Linear complexity for modifier pcm and size measure n.
Definition core.hpp:4796
Gecode::PropCost::LO
@ LO
Cheap.
Definition core.hpp:513
Gecode::Propagator::Space
friend class Space
Definition core.hpp:1066
Gecode::Propagator::med
ModEventDelta med
A set of modification events (used during propagation).
Definition core.hpp:1075
Gecode::Propagator::Propagator
Propagator(Home home)
Constructor for posting.
Definition core.hpp:3498
Gecode::View
Gecode::ValSelCommitBase::val
virtual Val val(const Space &home, View x, int i)=0
Return value of view x at position i.
Gecode::ViewArray
View arrays.
Definition array.hpp:253
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_REWRITE
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition macros.hpp:116
Gecode::FloatNum
double FloatNum
Floating point number base type.
Definition float.hh:106
Gecode::RM_IMP
@ RM_IMP
Implication for reification.
Definition int.hh:862
Gecode::RM_PMI
@ RM_PMI
Inverse implication for reification.
Definition int.hh:869
Gecode::Float::Rel
Simple relation propagators.
Gecode::Float
Floating point numbers.
Gecode::Float::RT_TRUE
@ RT_TRUE
Relation does hold.
Definition view.hpp:536
Gecode::Float::RT_FALSE
@ RT_FALSE
Relation does not hold.
Definition view.hpp:534
Gecode::Float::RT_MAYBE
@ RT_MAYBE
Relation may hold or not.
Definition view.hpp:535
Gecode::Float::ME_FLOAT_VAL
const Gecode::ModEvent ME_FLOAT_VAL
Domain operation has resulted in a value (assigned variable).
Definition var-type.hpp:264
Gecode::Float::rtest_eq
RelTest rtest_eq(View x, View y)
Test whether views x and y are equal.
Definition rel-test.hpp:40
Gecode::Float::overlap
bool overlap(const FloatVal &x, const FloatVal &y)
Definition val.hpp:498
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::Int
Finite domain integers.
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::max
void max(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
Definition arithmetic.cpp:49
forceinline
#define forceinline
Definition config.hpp:187
GECODE_NEVER
#define GECODE_NEVER
Assert that this command is never executed.
Definition macros.hpp:56