// -*- C++ -*-
// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 2, or (at your option) any later
// version.
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// As a special exception, you may use this file as part of a free
// software library without restriction. Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to
// produce an executable, this file does not by itself cause the
// resulting executable to be covered by the GNU General Public
// License. This exception does not however invalidate any other
// reasons why the executable file might be covered by the GNU General
// Public License.
// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied
// warranty.
/**
* @file twister_rand_gen.cc
*/
#include <util/rng/twister_rand_gen.hpp>
#include <ctime>
namespace pb_ds
{
namespace test
#ifdef PB_DS_TWISTER_RAND_GEN_DEBUG
#define PB_DS_DBG_ASSERT(X) assert(X)
#define PB_DS_DBG_VERIFY(X) assert(X)
#define PB_DS_DBG_ONLY(X) X
#else // #ifdef PB_DS_TWISTER_RAND_GEN_DEBUG
#define PB_DS_DBG_ASSERT(X)
#define PB_DS_DBG_VERIFY(X) {if((X)==0);}
#define PB_DS_DBG_ONLY(X) ;
#endif // #ifdef PB_DS_TWISTER_RAND_GEN_DEBUG
twister_rand_gen::
twister_rand_gen(unsigned int seed)
: m_base_generator(seed)
// Do nothing.
}
void
init(unsigned int seed)
{ m_base_generator.seed(seed); }
unsigned long
get_unsigned_long(unsigned long min, unsigned long max)
PB_DS_DBG_ASSERT(max >= min);
const double prob = get_prob();
const unsigned long rand_word =
(unsigned long)((max - min + 1) * prob) + min;
PB_DS_DBG_ASSERT(rand_word <= max);
return rand_word;
double
get_prob()
const double eng_min = m_base_generator.min();
const double eng_range =
static_cast<const double>(m_base_generator.max() - eng_min);
const double eng_res =
static_cast<const double>(m_base_generator() - eng_min);
const double ret = eng_res / eng_range;
PB_DS_DBG_ASSERT(ret >=0 && ret <= 1);
return ret;
#undef PB_DS_DBG_ASSERT
#undef PB_DS_DBG_VERIFY
#undef PB_DS_DBG_ONLY
} // namespace test
} // namespace pb_ds