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subsumption.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, 2015
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
00016  *  without limitation the rights to use, copy, modify, merge, publish,
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
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 namespace Gecode { namespace Int { namespace Cumulative {
00035 
00036   template<class Task>
00037   forceinline ExecStatus
00038   subsumed(Space& home, Propagator& p, int c, TaskArray<Task>& t) {
00039     Region r;
00040 
00041     if (Event* e = Event::events(r,t)) {
00042       // Process events, use ccur as the capacity that is still free
00043       do {
00044         // Current time
00045         int time = e->time();
00046         // Process events for completion of required part
00047         for ( ; (e->type() == Event::LRT) && (e->time() == time); e++)
00048           c += t[e->idx()].c();
00049         // Process events for zero-length task
00050         for ( ; (e->type() == Event::ZRO) && (e->time() == time); e++)
00051           if (c < t[e->idx()].c())
00052             return ES_FAILED;
00053         // Process events for start of required part
00054         for ( ;  (e->type() == Event::ERT) && (e->time() == time); e++) {
00055           c -= t[e->idx()].c();
00056           if (c < 0)
00057             return ES_FAILED;
00058         }
00059       } while (e->type() != Event::END);
00060     } else {
00061       return ES_OK;
00062     }
00063 
00064     return home.ES_SUBSUMED(p);
00065   }
00066 
00067 }}}
00068 
00069 // STATISTICS: int-prop