f92ab29ffa
2016-04-29 Chris Gregory <czipperz@gmail.com> * config/*: Remove trailing whitespace. * src/*: Likewise. * testsuite/tr1/*: Likewise. * testsuite/util/*: Likewise. From-SVN: r235645
98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
// -*- C++ -*-
|
|
|
|
// Copyright (C) 2005-2016 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 3, 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 COPYING3. If not see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
// 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 testsuite_rng.h
|
|
*/
|
|
|
|
#ifndef _GLIBCXX_TESTSUITE_RNG_H
|
|
#define _GLIBCXX_TESTSUITE_RNG_H
|
|
|
|
#include <ctime>
|
|
#include <climits>
|
|
#include <debug/debug.h>
|
|
#include <tr1/random>
|
|
|
|
namespace __gnu_pbds
|
|
{
|
|
namespace test
|
|
{
|
|
class twister_rand_gen
|
|
{
|
|
public:
|
|
twister_rand_gen(unsigned int seed =
|
|
static_cast<unsigned int>(std::time(0)))
|
|
: m_base_generator(seed)
|
|
{
|
|
// Do nothing.
|
|
}
|
|
|
|
void
|
|
init(unsigned int seed)
|
|
{ m_base_generator.seed(seed); }
|
|
|
|
static unsigned int
|
|
get_time_determined_seed()
|
|
{ return(static_cast<unsigned int>(std::time(0))); }
|
|
|
|
unsigned long
|
|
get_unsigned_long(unsigned long min = 0,
|
|
unsigned long max = UINT_MAX - 1)
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT(max >= min);
|
|
const double prob = get_prob();
|
|
const unsigned long r = (unsigned long)((max - min + 1) * prob) + min;
|
|
_GLIBCXX_DEBUG_ASSERT(r <= max);
|
|
return r;
|
|
}
|
|
|
|
double
|
|
get_prob()
|
|
{
|
|
const double min = m_base_generator.min();
|
|
const double max = m_base_generator.max();
|
|
const double range = static_cast<const double>(max - min);
|
|
const double res = static_cast<const double>(m_base_generator() - min);
|
|
const double ret = res / range;
|
|
_GLIBCXX_DEBUG_ASSERT(ret >= 0 && ret <= 1);
|
|
return ret;
|
|
}
|
|
|
|
private:
|
|
typedef std::tr1::mt19937 base_generator_t;
|
|
|
|
base_generator_t m_base_generator;
|
|
};
|
|
} // namespace test
|
|
} // namespace __gnu_pbds
|
|
|
|
#endif // #ifndef _GLIBCXX_TESTSUITE_RNG_H
|