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overload.hpp

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Christian Schulte <schulte@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Christian Schulte, 2009
00008  *
00009  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
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00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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00032  */
00033 
00034 namespace Gecode { namespace Int { namespace Unary {
00035 
00036   // Overload checking for mandatory tasks
00037   template<class ManTask>
00038   ExecStatus
00039   overload(TaskArray<ManTask>& t) {
00040     TaskViewArray<typename TaskTraits<ManTask>::TaskViewFwd> f(t);
00041     sort<typename TaskTraits<ManTask>::TaskViewFwd,STO_LCT,true>(f);
00042 
00043     Region r;
00044     OmegaTree<typename TaskTraits<ManTask>::TaskViewFwd> o(r,f);
00045 
00046     for (int i=0; i<f.size(); i++) {
00047       o.insert(i);
00048       if (o.ect() > f[i].lct())
00049         return ES_FAILED;
00050     }
00051     return ES_OK;
00052   }
00053 
00054   // Overload checking for optional tasks
00055   template<class OptTask, class PL>
00056   ExecStatus
00057   overload(Space& home, Propagator& p, TaskArray<OptTask>& t) {
00058     TaskViewArray<typename TaskTraits<OptTask>::TaskViewFwd> f(t);
00059     sort<typename TaskTraits<OptTask>::TaskViewFwd,STO_LCT,true>(f);
00060 
00061     Region r;
00062     OmegaLambdaTree<typename TaskTraits<OptTask>::TaskViewFwd> ol(r,f,false);
00063 
00064     bool to_purge = false;
00065 
00066     for (int i=0; i<f.size(); i++) {
00067       if (f[i].optional()) {
00068         ol.linsert(i);
00069       } else if (f[i].mandatory()) {
00070         ol.oinsert(i);
00071         if (ol.ect() > f[i].lct())
00072           return ES_FAILED;
00073       }
00074       while (!ol.lempty() && (ol.lect() > f[i].lct())) {
00075         int j = ol.responsible();
00076         GECODE_ME_CHECK(f[j].excluded(home));
00077         ol.lremove(j);
00078         to_purge = true;
00079       }
00080     }
00081 
00082     if (to_purge)
00083       GECODE_ES_CHECK((purge<OptTask,PL>(home,p,t)));
00084     return ES_OK;
00085   }
00086 
00087 }}}
00088 
00089 // STATISTICS: int-prop