options.cpp
Go to the documentation of this file.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, 2008 00008 * 00009 * Last modified: 00010 * $Date: 2009-10-13 15:19:20 +0200 (Tue, 13 Oct 2009) $ by $Author: schulte $ 00011 * $Revision: 9887 $ 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/search.hh> 00039 00040 #include <cmath> 00041 00042 namespace Gecode { namespace Search { 00043 00044 const Options Options::def; 00045 00046 Options 00047 Options::expand(void) const { 00048 #ifdef GECODE_HAS_THREADS 00049 double t = threads; 00050 if (t <= -1.0) { 00051 t = Support::Thread::npu() + t; 00052 } else if (t < 0.0) { 00053 t = (1.0 + t) * Support::Thread::npu(); 00054 } else if (t == 0.0) { 00055 t = Support::Thread::npu(); 00056 } else if (t < 1.0) { 00057 t = t * Support::Thread::npu(); 00058 } 00059 t = floor(t+0.5); 00060 if (t < 1.0) 00061 t = 1.0; 00062 Options o(*this); 00063 o.threads = t; 00064 return o; 00065 #else 00066 return *this; 00067 #endif 00068 } 00069 00070 }} 00071 00072 // STATISTICS: search-other