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
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 *
 */

#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