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man-prop.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  * Guido Tack <tack@gecode.org>
6  *
7  * Copyright:
8  * Christian Schulte, 2009
9  * Guido Tack, 2010
10  *
11  * Last modified:
12  * $Date: 2011-07-13 22:44:50 +0200 (Wed, 13 Jul 2011) $ by $Author: tack $
13  * $Revision: 12202 $
14  *
15  * This file is part of Gecode, the generic constraint
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39 
40 namespace Gecode { namespace Int { namespace Cumulative {
41 
42  template<class ManTask, class Cap>
45  : TaskProp<ManTask,Int::PC_INT_DOM>(home,t), c(c0) {
46  c.subscribe(home,*this,Int::PC_INT_BND);
47  }
48 
49  template<class ManTask, class Cap>
53  : TaskProp<ManTask,Int::PC_INT_DOM>(home,shared,p) {
54  c.update(home,shared,p.c);
55  }
56 
57  template<class ManTask, class Cap>
60  // Capacity must be nonnegative
61  GECODE_ME_CHECK(c.gq(home, 0));
62  // Check that tasks do not overload resource
63  for (int i=t.size(); i--; )
64  if (t[i].c() > c.max())
65  return ES_FAILED;
66  if (t.size() == 1)
67  GECODE_ME_CHECK(c.gq(home, t[0].c()));
68  if (t.size() > 1) {
69  if (c.assigned() && c.val()==1) {
71  for (int i=t.size(); i--; )
72  mt[i]=t[i];
74  ::post(home,mt);
75  } else {
76  (void) new (home) ManProp<ManTask,Cap>(home,c,t);
77  }
78  }
79  return ES_OK;
80  }
81 
82  template<class ManTask, class Cap>
83  Actor*
84  ManProp<ManTask,Cap>::copy(Space& home, bool share) {
85  return new (home) ManProp<ManTask,Cap>(home,share,*this);
86  }
87 
88  template<class ManTask, class Cap>
89  forceinline size_t
92  c.cancel(home,*this,PC_INT_BND);
93  return sizeof(*this);
94  }
95 
96  template<class ManTask, class Cap>
97  ExecStatus
99  // Only bounds changes?
100  if (Int::IntView::me(med) != Int::ME_INT_DOM)
101  GECODE_ES_CHECK(overload(home,c.max(),t));
102  GECODE_ES_CHECK(edgefinding(home,c.max(),t));
103  bool subsumed;
104  ExecStatus es = basic(home,subsumed,c,t);
105  GECODE_ES_CHECK(es);
106  if (subsumed)
107  return home.ES_SUBSUMED(*this);
108  if (Cap::varderived() && c.assigned() && c.val()==1) {
109  // Check that tasks do not overload resource
110  for (int i=t.size(); i--; )
111  if (t[i].c() > 1)
112  return ES_FAILED;
113  // Rewrite to unary resource constraint
115  for (int i=t.size(); i--;)
116  ut[i]=t[i];
117  GECODE_REWRITE(*this,
119  ::post(home(*this),ut)));
120  } else {
121  return es;
122  }
123  }
124 
125 }}}
126 
127 // STATISTICS: int-prop
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition: macros.hpp:109
NodeType t
Type of node.
Definition: bool-expr.cpp:234
void post(Home home, Term *t, int n, FloatRelType frt, FloatVal c)
Post propagator for linear constraint over floats.
Definition: post.cpp:228
virtual Actor * copy(Space &home, bool share)
Perform copying during cloning.
Definition: man-prop.hpp:84
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
Scheduling propagator for unary resource with mandatory tasks
Definition: unary.hh:787
ManProp(Home home, Cap c, TaskArray< ManTask > &t)
Constructor for creation.
Definition: man-prop.hpp:44
ExecStatus basic(Space &home, bool &subsumed, Cap c, TaskArray< Task > &t)
Perform basic propagation.
Definition: basic.hpp:93
ExecStatus overload(Space &home, int c, TaskArray< ManTask > &t)
Check mandatory tasks t for overload.
Definition: overload.hpp:45
Propagator for tasks
Definition: task.hh:424
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition: man-prop.hpp:90
static ExecStatus post(Home home, Cap c, TaskArray< ManTask > &t)
Post propagator that schedules tasks on cumulative resource.
Definition: man-prop.hpp:59
Computation spaces.
Definition: core.hpp:1362
Traits class for mapping tasks to task views.
Definition: task.hh:159
Base-class for both propagators and branchers.
Definition: core.hpp:666
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:84
Gecode::FloatVal c(-8, 8)
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Gecode::IntArgs i(4, 1, 2, 3, 4)
Execution has resulted in failure.
Definition: core.hpp:525
const Gecode::PropCond PC_INT_BND
Propagate when minimum or maximum of a view changes.
Definition: var-type.hpp:91
const Gecode::PropCond PC_INT_DOM
Propagate when domain changes.
Definition: var-type.hpp:100
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:45
Cap c
Resource capacity.
Definition: cumulative.hh:704
ExecStatus subsumed(Space &home, Propagator &p, TaskArray< Task > &t)
Check tasks t for subsumption.
Definition: subsumption.hpp:42
const Gecode::ModEvent ME_INT_DOM
Domain operation has changed the domain.
Definition: var-type.hpp:72
ExecStatus
Definition: core.hpp:523
static ModEvent me(const ModEventDelta &med)
Return modification event for view type in med.
#define forceinline
Definition: config.hpp:132
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: man-prop.hpp:98
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:67
Execution is okay.
Definition: core.hpp:527
Scheduling propagator for cumulative resource with mandatory tasks.
Definition: cumulative.hh:700
bool shared(const ConstView< ViewA > &, const ConstView< ViewB > &)
Test whether views share same variable.
Definition: view.hpp:662
Gecode toplevel namespace
friend FloatVal max(const FloatVal &x, const FloatVal &y)
Definition: val.hpp:390
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717
ExecStatus edgefinding(Space &home, int c, TaskViewArray< TaskView > &t)