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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2007
*
* 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 Int { namespace Circuit {
/*
* The actual propagator
*
*/
template<class View, class Offset>
forceinline
Val<View,Offset>::Val(Home home, ViewArray<View>& x, Offset& o)
: Base<View,Offset>(home,x,o) {}
template<class View, class Offset>
forceinline
Val<View,Offset>::Val(Space& home, Val<View,Offset>& p)
: Base<View,Offset>(home,p) {}
template<class View, class Offset>
Actor*
Val<View,Offset>::copy(Space& home) {
return new (home) Val<View,Offset>(home,*this);
}
template<class View, class Offset>
PropCost
Val<View,Offset>::cost(const Space&, const ModEventDelta&) const {
return PropCost::linear(PropCost::HI, x.size());
}
template<class View, class Offset>
ExecStatus
Val<View,Offset>::propagate(Space& home, const ModEventDelta&) {
GECODE_ES_CHECK((Int::Distinct::prop_val<View,true>(home,y)));
ExecStatus esc = connected(home);
if (esc != ES_FIX)
return esc;
/*
* One cannot have a single unassigned view as the views constitute
* a permutation.
*/
if (y.size() < 2)
return home.ES_SUBSUMED(*this);
return path(home);
}
template<class View, class Offset>
ExecStatus
Val<View,Offset>::post(Home home, ViewArray<View>& x, Offset& o) {
int n = x.size();
if (n == 1) {
GECODE_ME_CHECK(o(x[0]).eq(home,0));
} else if (n == 2) {
GECODE_ME_CHECK(o(x[0]).eq(home,1));
GECODE_ME_CHECK(o(x[1]).eq(home,0));
} else {
for (int i=0; i<n; i++) {
GECODE_ME_CHECK(o(x[i]).gq(home,0));
GECODE_ME_CHECK(o(x[i]).le(home,n));
GECODE_ME_CHECK(o(x[i]).nq(home,i));
}
(void) new (home) Val<View,Offset>(home,x,o);
}
return ES_OK;
}
}}}
// STATISTICS: int-prop
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