options.cpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2008
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <gecode/search.hh>
#include <cmath>
namespace Gecode { namespace Search {
const Options Options::def;
Options
Options::expand(void) const {
#ifdef GECODE_HAS_THREADS
double t = threads;
if (t <= -1.0) {
t = Support::Thread::npu() + t;
} else if (t < 0.0) {
t = (1.0 + t) * Support::Thread::npu();
} else if (t == 0.0) {
t = Support::Thread::npu();
} else if (t < 1.0) {
t = t * Support::Thread::npu();
}
t = floor(t+0.5);
if (t < 1.0)
t = 1.0;
Options o(*this);
o.threads = t;
return o;
#else
return *this;
#endif
}
}}
// STATISTICS: search-other
Gecode::Search::Options
Search engine options
Definition search.hh:746
Gecode::Search::Options::def
static const Options def
Default options.
Definition search.hh:771
Gecode::Search::Options::Options
Options(void)
Initialize with default values.
Definition options.hpp:37
Gecode::Search::Options::expand
Options expand(void) const
Expand with real number of threads.
Definition options.cpp:43
Gecode::Search::Options::threads
double threads
Number of threads to use.
Definition search.hh:751
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
Search engines
Gecode
Gecode toplevel namespace
search.hh