mirror of https://github.com/CGAL/cgal
82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
// Copyright (c) 1997-2001 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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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; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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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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//
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//
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// Author(s) : Sven Schönherr <sven@inf.ethz.ch>
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#include <CGAL/Random.h>
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#include <ctime>
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CGAL_BEGIN_NAMESPACE
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// Class implementation (continued)
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// ================================
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// constructors
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Random::
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Random( )
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: rand_max_plus_1( RAND_MAX+1.0), 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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std::srand( seed);
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random_value = get_int(0, 1<<15);
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}
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Random::
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Random( unsigned int seed_)
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: rand_max_plus_1( RAND_MAX+1.0), val(0), seed(seed_)
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{
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// initialize random numbers generator
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std::srand( 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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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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void
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Random::save_state( Random::State& state) const
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{
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state = Random::State(random_value, val);
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}
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void
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Random::restore_state( const Random::State& state)
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{
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random_value = state.first;
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val = state.second;
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}
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// Global variables
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// ================
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Random default_random;
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CGAL_END_NAMESPACE
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