1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  *  Main authors:
4  *     Christian Schulte <schulte@gecode.org>
5  *
6  *  Copyright:
7  *     Christian Schulte, 2009
8  *
9  *  This file is part of Gecode, the generic constraint
10  *  development environment:
11  *     http://www.gecode.org
12  *
13  *  Permission is hereby granted, free of charge, to any person obtaining
14  *  a copy of this software and associated documentation files (the
15  *  "Software"), to deal in the Software without restriction, including
16  *  without limitation the rights to use, copy, modify, merge, publish,
17  *  distribute, sublicense, and/or sell copies of the Software, and to
18  *  permit persons to whom the Software is furnished to do so, subject to
19  *  the following conditions:
20  *
21  *  The above copyright notice and this permission notice shall be
22  *  included in all copies or substantial portions of the Software.
23  *
24  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31  *
32  */
33 
34 namespace Gecode { namespace Int { namespace Unary {
35 
36   // Overload checking for mandatory tasks
37   template<class ManTask>
38   ExecStatus
overload(TaskArray<ManTask> & t)39   overload(TaskArray<ManTask>& t) {
40     TaskViewArray<typename TaskTraits<ManTask>::TaskViewFwd> f(t);
41     sort<typename TaskTraits<ManTask>::TaskViewFwd,STO_LCT,true>(f);
42 
43     Region r;
44     OmegaTree<typename TaskTraits<ManTask>::TaskViewFwd> o(r,f);
45 
46     for (int i=0; i<f.size(); i++) {
47       o.insert(i);
48       if (o.ect() > f[i].lct())
49         return ES_FAILED;
50     }
51     return ES_OK;
52   }
53 
54   // Overload checking for optional tasks
55   template<class OptTask, class PL>
56   ExecStatus
overload(Space & home,Propagator & p,TaskArray<OptTask> & t)57   overload(Space& home, Propagator& p, TaskArray<OptTask>& t) {
58     TaskViewArray<typename TaskTraits<OptTask>::TaskViewFwd> f(t);
59     sort<typename TaskTraits<OptTask>::TaskViewFwd,STO_LCT,true>(f);
60 
61     Region r;
62     OmegaLambdaTree<typename TaskTraits<OptTask>::TaskViewFwd> ol(r,f,false);
63 
64     bool to_purge = false;
65 
66     for (int i=0; i<f.size(); i++) {
67       if (f[i].optional()) {
68         ol.linsert(i);
69       } else if (f[i].mandatory()) {
70         ol.oinsert(i);
71         if (ol.ect() > f[i].lct())
72           return ES_FAILED;
73       }
74       while (!ol.lempty() && (ol.lect() > f[i].lct())) {
75         int j = ol.responsible();
76         GECODE_ME_CHECK(f[j].excluded(home));
77         ol.lremove(j);
78         to_purge = true;
79       }
80     }
81 
82     if (to_purge)
83       GECODE_ES_CHECK((purge<OptTask,PL>(home,p,t)));
84     return ES_OK;
85   }
86 
87 }}}
88 
89 // STATISTICS: int-prop
90