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action.cpp

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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, 2012
00008  *
00009  *  Last modified:
00010  *     $Date: 2017-02-28 00:23:09 +0100 (Tue, 28 Feb 2017) $ by $Author: schulte $
00011  *     $Revision: 15510 $
00012  *
00013  *  This file is part of Gecode, the generic constraint
00014  *  development environment:
00015  *     http://www.gecode.org
00016  *
00017  *  Permission is hereby granted, free of charge, to any person obtaining
00018  *  a copy of this software and associated documentation files (the
00019  *  "Software"), to deal in the Software without restriction, including
00020  *  without limitation the rights to use, copy, modify, merge, publish,
00021  *  distribute, sublicense, and/or sell copies of the Software, and to
00022  *  permit persons to whom the Software is furnished to do so, subject to
00023  *  the following conditions:
00024  *
00025  *  The above copyright notice and this permission notice shall be
00026  *  included in all copies or substantial portions of the Software.
00027  *
00028  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00029  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00030  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00031  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00032  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00033  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00034  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00035  *
00036  */
00037 
00038 #include <gecode/kernel.hh>
00039 
00040 namespace Gecode {
00041 
00042   const Action Action::def;
00043 
00044   Action::Action(const Action& a)
00045     : storage(a.storage) {
00046     if (storage != NULL) {
00047       acquire();
00048       storage->use_cnt++;
00049       release();
00050     }
00051   }
00052 
00053   Action&
00054   Action::operator =(const Action& a) {
00055     if (storage != a.storage) {
00056       if (storage != NULL) {
00057         bool done;
00058         acquire();
00059         done = (--storage->use_cnt == 0);
00060         release();
00061         if (done)
00062           delete storage;
00063       }
00064       storage = a.storage;
00065       if (storage != NULL) {
00066         acquire();
00067         storage->use_cnt++;
00068         release();
00069       }
00070     }
00071     return *this;
00072   }
00073 
00074   Action::~Action(void) {
00075     if (storage == NULL)
00076       return;
00077     bool done;
00078     acquire();
00079     done = (--storage->use_cnt == 0);
00080     release();
00081     if (done)
00082       delete storage;
00083   }
00084 
00085   void
00086   Action::update(Space&, bool, Action& a) {
00087     const_cast<Action&>(a).acquire();
00088     storage = a.storage;
00089     storage->use_cnt++;
00090     const_cast<Action&>(a).release();
00091   }
00092 
00093   void
00094   Action::decay(Space&, double d) {
00095     if ((d < 0.0) || (d > 1.0))
00096       throw IllegalDecay("Action");
00097     acquire();
00098     storage->invd = 1.0 / d;
00099     release();
00100   }
00101 
00102   double
00103   Action::decay(const Space&) const {
00104     double d;
00105     const_cast<Action*>(this)->acquire();
00106     d = 1.0 / storage->invd;
00107     const_cast<Action*>(this)->release();
00108     return d;
00109   }
00110 
00111 }
00112 
00113 // STATISTICS: kernel-branch