112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
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// Copyright (c) 1997-2001
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 3 of the License,
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// or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-3.0+
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//
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//
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// Author(s) : Sven Schönherr <sven@inf.ethz.ch>
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#ifdef CGAL_HEADER_ONLY
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#define CGAL_INLINE_FUNCTION inline
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#else
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#define CGAL_INLINE_FUNCTION
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#endif
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#include <ctime>
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#include <iostream>
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#include <sstream>
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namespace CGAL {
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// Class implementation (continued)
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// ================================
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// constructors
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CGAL_INLINE_FUNCTION
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Random::
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Random()
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: val(0)
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{
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// get system's time
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std::time_t s;
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std::time( &s);
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seed = (unsigned int)s;
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// initialize random numbers generator
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rng.seed(static_cast<boost::int32_t>(seed));
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random_value = get_int(0, 1<<15);
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}
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CGAL_INLINE_FUNCTION
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Random::
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Random(internal::Random_print_seed)
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: val(0)
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{
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// get system's time
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std::time_t s;
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std::time( &s);
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seed = (unsigned int)s;
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std::cerr << "CGAL::Random()::get_seed() = " << seed << std::endl;
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// initialize random numbers generator
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rng.seed(static_cast<boost::int32_t>(seed));
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random_value = get_int(0, 1<<15);
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}
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CGAL_INLINE_FUNCTION
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Random::
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Random( unsigned int seed)
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: val(0), seed(seed)
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{
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// initialize random numbers generator
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rng.seed(static_cast<boost::int32_t>(seed));
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random_value = get_int(0, 1<<15);
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}
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// seed
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CGAL_INLINE_FUNCTION
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unsigned int
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Random::get_seed () const
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{
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return seed;
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}
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// state
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CGAL_INLINE_FUNCTION
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void
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Random::save_state( Random::State& state) const
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{
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std::ostringstream os;
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os << rng;
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state = Random::State(os.str(),random_value, val, seed);
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}
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CGAL_INLINE_FUNCTION
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void
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Random::restore_state( const Random::State& state)
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{
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std::istringstream is(state.rng);
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is >> rng;
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random_value = state.random_value;
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val = state.val;
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seed = state.seed;
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}
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} //namespace CGAL
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