103 lines
2.2 KiB
C++
103 lines
2.2 KiB
C++
// 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)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Random_numbers/include/CGAL/Random_impl.h $
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// $Id: Random_impl.h 52164b1 2019-10-19T15:34:59+02:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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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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