subsumption.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2015
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
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*
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namespace Gecode { namespace Int { namespace Cumulative {
template<class Task>
forceinline ExecStatus
subsumed(Space& home, Propagator& p, int c, TaskArray<Task>& t) {
Region r;
if (Event* e = Event::events(r,t)) {
// Process events, use ccur as the capacity that is still free
do {
// Current time
int time = e->time();
// Process events for completion of required part
for ( ; (e->type() == Event::LRT) && (e->time() == time); e++)
c += t[e->idx()].c();
// Process events for zero-length task
for ( ; (e->type() == Event::ZRO) && (e->time() == time); e++)
if (c < t[e->idx()].c())
return ES_FAILED;
// Process events for start of required part
for ( ; (e->type() == Event::ERT) && (e->time() == time); e++) {
c -= t[e->idx()].c();
if (c < 0)
return ES_FAILED;
}
} while (e->type() != Event::END);
} else {
return ES_OK;
}
return home.ES_SUBSUMED(p);
}
}}}
// STATISTICS: int-prop
Gecode::Int::Event
Time-tabling event for task.
Definition task.hh:490
Gecode::Int::Event::events
static Event * events(Region &r, const TaskArray< Task > &t, bool &assigned)
Allocate from r and initialize event array with tasks t.
Definition event.hpp:83
Gecode::Int::Event::ZRO
@ ZRO
Zero-length task start time.
Definition task.hh:497
Gecode::Int::Event::ERT
@ ERT
Earliest required time of task.
Definition task.hh:498
Gecode::Int::Event::LRT
@ LRT
Latest required time of task.
Definition task.hh:494
Gecode::Int::Event::END
@ END
End marker.
Definition task.hh:499
Gecode::Int::TaskArray
Task array.
Definition task.hh:165
Gecode::Propagator
Base-class for propagators.
Definition core.hpp:1064
Gecode::Region
Handle to region.
Definition region.hpp:55
Gecode::Space
Computation spaces.
Definition core.hpp:1742
Gecode::Space::ES_SUBSUMED
ExecStatus ES_SUBSUMED(Propagator &p)
Definition core.hpp:3563
Gecode::Int::Cumulative
Scheduling for cumulative resources
Definition cumulative.cpp:40
Gecode::Int::Cumulative::subsumed
ExecStatus subsumed(Space &home, Propagator &p, int c, TaskArray< Task > &t)
Check for subsumption (all tasks must be assigned).
Definition subsumption.hpp:38
Gecode::Int
Finite domain integers.
Gecode
Gecode toplevel namespace
Gecode::ExecStatus
ExecStatus
Definition core.hpp:472
Gecode::ES_OK
@ ES_OK
Execution is okay.
Definition core.hpp:476
Gecode::ES_FAILED
@ ES_FAILED
Execution has resulted in failure.
Definition core.hpp:474
forceinline
#define forceinline
Definition config.hpp:187