main page
modules
namespaces
classes
files
Gecode home
Generated on Mon Jul 27 2020 00:00:00 for Gecode by
doxygen
1.8.18
gecode
search
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
* This file is part of Gecode, the generic constraint
10
* development environment:
11
* http://www.gecode.org
12
*
13
* Permission is hereby granted, free of charge, to any person obtaining
14
* a copy of this software and associated documentation files (the
15
* "Software"), to deal in the Software without restriction, including
16
* without limitation the rights to use, copy, modify, merge, publish,
17
* distribute, sublicense, and/or sell copies of the Software, and to
18
* permit persons to whom the Software is furnished to do so, subject to
19
* the following conditions:
20
*
21
* The above copyright notice and this permission notice shall be
22
* included in all copies or substantial portions of the Software.
23
*
24
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31
*
32
*/
33
34
#include <
gecode/search.hh
>
35
36
#include <cmath>
37
38
namespace
Gecode
{
namespace
Search {
39
40
const
Options
Options::def
;
41
42
Options
43
Options::expand
(
void
)
const
{
44
#ifdef GECODE_HAS_THREADS
45
double
t
=
threads
;
46
if
(
t
<= -1.0) {
47
t
=
Support::Thread::npu
() +
t
;
48
}
else
if
(
t
< 0.0) {
49
t
= (1.0 +
t
) *
Support::Thread::npu
();
50
}
else
if
(
t
== 0.0) {
51
t
=
Support::Thread::npu
();
52
}
else
if
(
t
< 1.0) {
53
t
=
t
*
Support::Thread::npu
();
54
}
55
t
= floor(
t
+0.5);
56
if
(
t
< 1.0)
57
t
= 1.0;
58
Options
o(*
this
);
59
o.
threads
=
t
;
60
return
o;
61
#else
62
return
*
this
;
63
#endif
64
}
65
66
}}
67
68
// STATISTICS: search-other
Gecode::Search::Options
Search engine options
Definition:
search.hh:746
t
NodeType t
Type of node.
Definition:
bool-expr.cpp:230
search.hh
Gecode
Gecode toplevel namespace
Gecode::Search::Options::expand
Options expand(void) const
Expand with real number of threads.
Definition:
options.cpp:43
Gecode::Search::Options::def
static const Options def
Default options.
Definition:
search.hh:771
Gecode::Support::Thread::npu
static unsigned int npu(void)
Return number of processing units (1 if information not available)
Definition:
none.hpp:76
Gecode::Search::Options::threads
double threads
Number of threads to use.
Definition:
search.hh:751