Generated on Sat Feb 7 2015 02:01:13 for Gecode by doxygen 1.8.9.1
options.cpp
Go to the documentation of this file.
1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2008
8  *
9  * Last modified:
10  * $Date: 2009-10-13 15:19:20 +0200 (Tue, 13 Oct 2009) $ by $Author: schulte $
11  * $Revision: 9887 $
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
17  * Permission is hereby granted, free of charge, to any person obtaining
18  * a copy of this software and associated documentation files (the
19  * "Software"), to deal in the Software without restriction, including
20  * without limitation the rights to use, copy, modify, merge, publish,
21  * distribute, sublicense, and/or sell copies of the Software, and to
22  * permit persons to whom the Software is furnished to do so, subject to
23  * the following conditions:
24  *
25  * The above copyright notice and this permission notice shall be
26  * included in all copies or substantial portions of the Software.
27  *
28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
32  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
33  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
34  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35  *
36  */
37 
38 #include <gecode/search.hh>
39 
40 #include <cmath>
41 
42 namespace Gecode { namespace Search {
43 
44  const Options Options::def;
45 
46  Options
47  Options::expand(void) const {
48 #ifdef GECODE_HAS_THREADS
49  double t = threads;
50  if (t <= -1.0) {
51  t = Support::Thread::npu() + t;
52  } else if (t < 0.0) {
53  t = (1.0 + t) * Support::Thread::npu();
54  } else if (t == 0.0) {
56  } else if (t < 1.0) {
57  t = t * Support::Thread::npu();
58  }
59  t = floor(t+0.5);
60  if (t < 1.0)
61  t = 1.0;
62  Options o(*this);
63  o.threads = t;
64  return o;
65 #else
66  return *this;
67 #endif
68  }
69 
70 }}
71 
72 // STATISTICS: search-other
NodeType t
Type of node.
Definition: bool-expr.cpp:234
static unsigned int npu(void)
Return number of processing units (1 if information not available)
Definition: none.hpp:80
Search engine options
Definition: search.hh:204
double threads
Number of threads to use.
Definition: search.hh:209
static const Options def
Default options.
Definition: search.hh:221
Options expand(void) const
Expand with real number of threads.
Definition: options.cpp:47
Gecode toplevel namespace