bbddd5d0c2
2006-08-14 Paolo Carlini <pcarlini@suse.de> * include/tr1/random (class poisson_distribution<>): Add. * include/tr1/random.tcc (poisson_distribution<>::operator(), operator<<(std::basic_ostream<>&, const poisson_distribution<>&), operator>>(std::basic_istream<>&, poisson_distribution<>&, poisson_distribution<>::poisson_distribution(const _RealType&)): Define. * testsuite/tr1/5_numerical_facilities/random/poisson_distribution/ requirements/typedefs.cc: New. * include/tr1/random.tcc (mersenne_twister<>::operator()): Tweak a bit for efficiency. * include/tr1/random.tcc (operator<<(std::basic_ostream<>&, const normal_distribution<>&), operator>>(std::basic_istream<>&, normal_distribution<>&)): Do not output _M_saved unnecessarily. * include/tr1/random: Trivial formatting fixes. * include/tr1/cmath: Likewise. From-SVN: r116149
2138 lines
66 KiB
C++
2138 lines
66 KiB
C++
// random number generation -*- C++ -*-
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// Copyright (C) 2006 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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#ifndef _TR1_RANDOM
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#define _TR1_RANDOM 1
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/**
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* @file
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* This is a TR1 C++ Library header.
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*/
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#include <algorithm>
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#include <bits/concept_check.h>
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#include <bits/cpp_type_traits.h>
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#include <cmath>
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#include <debug/debug.h>
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#include <iterator>
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#include <iosfwd>
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#include <limits>
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#include <tr1/type_traits>
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#include <tr1/cmath>
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#include <fstream>
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namespace std
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{
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_GLIBCXX_BEGIN_NAMESPACE(tr1)
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// [5.1] Random number generation
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/**
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* @addtogroup tr1_random Random Number Generation
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* A facility for generating random numbers on selected distributions.
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* @{
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*/
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/*
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* Implementation-space details.
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*/
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namespace
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{
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// Type selectors -- are these already implemented elsewhere?
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template<bool, typename _TpTrue, typename _TpFalse>
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struct _Select
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{
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typedef _TpTrue _Type;
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};
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template<typename _TpTrue, typename _TpFalse>
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struct _Select<false, _TpTrue, _TpFalse>
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{
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typedef _TpFalse _Type;
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};
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template<typename _UIntType, int __w, bool =
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__w < std::numeric_limits<_UIntType>::digits>
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struct _Shift
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{ static const _UIntType __value = 0; };
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template<typename _UIntType, int __w>
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struct _Shift<_UIntType, __w, true>
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{ static const _UIntType __value = _UIntType(1) << __w; };
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} // anonymous namespace
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/*
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* An adaptor class for converting the output of any Generator into
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* the input for a specific Distribution.
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*/
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template<typename _Engine, typename _Distribution>
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struct _Adaptor
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{
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typedef typename _Engine::result_type _Engine_result_type;
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typedef typename _Distribution::input_type result_type;
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public:
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_Adaptor(const _Engine& __g)
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: _M_g(__g) { }
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result_type
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operator()();
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private:
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_Engine _M_g;
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};
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/*
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* Converts a value generated by the adapted random number generator into a
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* value in the input domain for the dependent random number distribution.
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*
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* Because the type traits are compile time constants only the appropriate
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* clause of the if statements will actually be emitted by the compiler.
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*/
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template<typename _Engine, typename _Distribution>
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typename _Adaptor<_Engine, _Distribution>::result_type
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_Adaptor<_Engine, _Distribution>::
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operator()()
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{
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result_type __return_value = 0;
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if (is_integral<_Engine_result_type>::value
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&& is_integral<result_type>::value)
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__return_value = _M_g();
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else if (is_integral<_Engine_result_type>::value
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&& !is_integral<result_type>::value)
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__return_value = result_type(_M_g())
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/ result_type(_M_g.max() - _M_g.min() + result_type(1));
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else if (!is_integral<_Engine_result_type>::value
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&& !is_integral<result_type>::value)
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__return_value = result_type(_M_g())
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/ result_type(_M_g.max() - _M_g.min());
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return __return_value;
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}
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/**
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* Produces random numbers on a given disribution function using a un uniform
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* random number generation engine.
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*
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* @todo the engine_value_type needs to be studied more carefully.
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*/
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template<typename _Engine, typename _Dist>
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class variate_generator
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{
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// Concept requirements.
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__glibcxx_class_requires(_Engine, _CopyConstructibleConcept)
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// __glibcxx_class_requires(_Engine, _EngineConcept)
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// __glibcxx_class_requires(_Dist, _EngineConcept)
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public:
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typedef _Engine engine_type;
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typedef _Adaptor<_Engine, _Dist> engine_value_type;
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typedef _Dist distribution_type;
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typedef typename _Dist::result_type result_type;
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// tr1:5.1.1 table 5.1 requirement
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typedef typename std::__enable_if<result_type,
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is_arithmetic<result_type>::value
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>::__type _IsValidType;
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public:
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/**
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* Constructs a variate generator with the uniform random number
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* generator @p __eng for the random distribution @p __dist.
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*
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* @throws Any exceptions which may thrown by the copy constructors of
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* the @p _Engine or @p _Dist objects.
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*/
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variate_generator(engine_type __eng, distribution_type __dist)
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: _M_engine(__eng), _M_dist(__dist) { }
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/**
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* Gets the next generated value on the distribution.
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*/
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result_type
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operator()()
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{ return _M_dist(_M_engine); }
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/**
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* WTF?
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*/
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template<typename _Tp>
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result_type
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operator()(_Tp __value)
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{ return _M_dist(_M_engine, __value); }
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/**
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* Gets a reference to the underlying uniform random number generator
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* object.
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*/
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engine_value_type&
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engine()
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{ return _M_engine; }
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/**
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* Gets a const reference to the underlying uniform random number
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* generator object.
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*/
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const engine_value_type&
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engine() const
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{ return _M_engine; }
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/**
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* Gets a reference to the underlying random distribution.
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*/
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distribution_type&
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distribution()
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{ return _M_dist; }
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/**
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* Gets a const reference to the underlying random distribution.
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*/
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const distribution_type&
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distribution() const
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{ return _M_dist; }
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/**
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* Gets the closed lower bound of the distribution interval.
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*/
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result_type
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min() const
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{ return this->distribution().min(); }
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/**
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* Gets the closed upper bound of the distribution interval.
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*/
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result_type
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max() const
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{ return this->distribution().max(); }
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private:
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engine_value_type _M_engine;
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distribution_type _M_dist;
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};
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/**
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* @addtogroup tr1_random_generators Random Number Generators
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* @ingroup tr1_random
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*
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* These classes define objects which provide random or pseudorandom numbers,
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* either from a discrete or a continuous interval. The random number
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* generator supplied as a part of this library are all uniform random number
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* generators which provide a sequence of random number uniformly distributed
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* over their range.
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*
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* A number generator is a function object with an operator() that takes zero
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* arguments and returns a number.
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*
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* A compliant random number generator must satisy the following requirements.
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* <table border=1 cellpadding=10 cellspacing=0>
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* <caption align=top>Random Number Generator Requirements</caption>
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* <tr><td>To be documented.</td></tr>
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* </table>
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*
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* @{
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*/
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/**
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* @brief A model of a linear congruential random number generator.
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*
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* A random number generator that produces pseudorandom numbers using the
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* linear function @f$x_{i+1}\leftarrow(ax_{i} + c) \bmod m @f$.
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*
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* The template parameter @p _UIntType must be an unsigned integral type
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* large enough to store values up to (__m-1). If the template parameter
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* @p __m is 0, the modulus @p __m used is
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* std::numeric_limits<_UIntType>::max() plus 1. Otherwise, the template
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* parameters @p __a and @p __c must be less than @p __m.
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*
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* The size of the state is @f$ 1 @f$.
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*/
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template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m>
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class linear_congruential;
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template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m,
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typename _CharT, typename _Traits>
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std::basic_ostream<_CharT, _Traits>&
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operator<<(std::basic_ostream<_CharT, _Traits>& __os,
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const linear_congruential<_UIntType, __a, __c, __m>& __lcr);
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template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m,
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typename _CharT, typename _Traits>
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std::basic_istream<_CharT, _Traits>&
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operator>>(std::basic_istream<_CharT, _Traits>& __is,
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linear_congruential<_UIntType, __a, __c, __m>& __lcr);
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template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m>
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class linear_congruential
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{
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__glibcxx_class_requires(_UIntType, _UnsignedIntegerConcept)
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// __glibcpp_class_requires(__a < __m && __c < __m)
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public:
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/** The type of the generated random value. */
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typedef _UIntType result_type;
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/** The multiplier. */
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static const _UIntType multiplier = __a;
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/** An increment. */
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static const _UIntType increment = __c;
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/** The modulus. */
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static const _UIntType modulus = __m;
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/**
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* Constructs a %linear_congruential random number generator engine with
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* seed @p __s. The default seed value is 1.
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*
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* @param __s The initial seed value.
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*/
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explicit
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linear_congruential(unsigned long __x0 = 1)
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{ this->seed(__x0); }
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/**
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* Constructs a %linear_congruential random number generator engine
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* seeded from the generator function @p __g.
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*
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* @param __g The seed generator function.
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*/
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template<class _Gen>
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linear_congruential(_Gen& __g)
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{ this->seed(__g); }
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/**
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* Reseeds the %linear_congruential random number generator engine
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* sequence to the seed @g __s.
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*
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* @param __s The new seed.
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*/
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void
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seed(unsigned long __s = 1);
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/**
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* Reseeds the %linear_congruential random number generator engine
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* sequence using values from the generator function @p __g.
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*
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* @param __g the seed generator function.
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*/
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template<class _Gen>
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void
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seed(_Gen& __g)
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{ seed(__g, typename is_fundamental<_Gen>::type()); }
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/**
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* Gets the smallest possible value in the output range.
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*/
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result_type
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min() const;
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/**
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* Gets the largest possible value in the output range.
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*/
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result_type
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max() const;
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/**
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* Gets the next random number in the sequence.
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*/
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result_type
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operator()();
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/**
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* Compares two linear congruential random number generator
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* objects of the same type for equality.
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*
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* @param __lhs A linear congruential random number generator object.
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* @param __rhs Another linear congruential random number generator obj.
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*
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* @returns true if the two objects are equal, false otherwise.
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*/
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friend bool
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operator==(const linear_congruential& __lhs,
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const linear_congruential& __rhs)
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{ return __lhs._M_x == __rhs._M_x; }
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/**
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* Compares two linear congruential random number generator
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* objects of the same type for inequality.
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*
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* @param __lhs A linear congruential random number generator object.
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* @param __rhs Another linear congruential random number generator obj.
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*
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* @returns true if the two objects are not equal, false otherwise.
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*/
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friend bool
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operator!=(const linear_congruential& __lhs,
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const linear_congruential& __rhs)
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{ return !(__lhs == __rhs); }
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/**
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* Writes the textual representation of the state x(i) of x to @p __os.
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*
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* @param __os The output stream.
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* @param __lcr A % linear_congruential random number generator.
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* @returns __os.
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*/
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template<class _UIntType1, _UIntType1 __a1, _UIntType1 __c1,
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_UIntType1 __m1,
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typename _CharT, typename _Traits>
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friend std::basic_ostream<_CharT, _Traits>&
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operator<<(std::basic_ostream<_CharT, _Traits>& __os,
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const linear_congruential<_UIntType1, __a1, __c1,
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__m1>& __lcr);
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/**
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* Sets the state of the engine by reading its textual
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* representation from @p __is.
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*
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* The textual representation must have been previously written using an
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* output stream whose imbued locale and whose type's template
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* specialization arguments _CharT and _Traits were the same as those of
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* @p __is.
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*
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* @param __is The input stream.
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* @param __lcr A % linear_congruential random number generator.
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* @returns __is.
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*/
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template<class _UIntType1, _UIntType1 __a1, _UIntType1 __c1,
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_UIntType1 __m1,
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typename _CharT, typename _Traits>
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friend std::basic_istream<_CharT, _Traits>&
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operator>>(std::basic_istream<_CharT, _Traits>& __is,
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linear_congruential<_UIntType1, __a1, __c1, __m1>& __lcr);
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private:
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template<class _Gen>
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void
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seed(_Gen& __g, true_type)
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{ return seed(static_cast<unsigned long>(__g)); }
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template<class _Gen>
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void
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seed(_Gen& __g, false_type);
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private:
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_UIntType _M_x;
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};
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/**
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* The classic Minimum Standard rand0 of Lewis, Goodman, and Miller.
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*/
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typedef linear_congruential<unsigned long, 16807, 0, 2147483647> minstd_rand0;
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/**
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* An alternative LCR (Lehmer Generator function) .
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*/
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typedef linear_congruential<unsigned long, 48271, 0, 2147483647> minstd_rand;
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/**
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* A generalized feedback shift register discrete random number generator.
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*
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* This algorithm avoind multiplication and division and is designed to be
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* friendly to a pipelined architecture. If the parameters are chosen
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* correctly, this generator will produce numbers with a very long period and
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* fairly good apparent entropy, although still not cryptographically strong.
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*
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* The best way to use this generator is with the predefined mt19937 class.
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*
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* This algorithm was originally invented by Makoto Matsumoto and
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* Takuji Nishimura.
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*
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* @var word_size The number of bits in each element of the state vector.
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* @var state_size The degree of recursion.
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* @var shift_size The period parameter.
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* @var mask_bits The separation point bit index.
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* @var parameter_a The last row of the twist matrix.
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* @var output_u The first right-shift tempering matrix parameter.
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* @var output_s The first left-shift tempering matrix parameter.
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* @var output_b The first left-shift tempering matrix mask.
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* @var output_t The second left-shift tempering matrix parameter.
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* @var output_c The second left-shift tempering matrix mask.
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* @var output_l The second right-shift tempering matrix parameter.
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*/
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template<class _UIntType, int __w, int __n, int __m, int __r,
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_UIntType __a, int __u, int __s, _UIntType __b, int __t,
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_UIntType __c, int __l>
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class mersenne_twister;
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template<class _UIntType, int __w, int __n, int __m, int __r,
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_UIntType __a, int __u, int __s, _UIntType __b, int __t,
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_UIntType __c, int __l,
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typename _CharT, typename _Traits>
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std::basic_ostream<_CharT, _Traits>&
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operator<<(std::basic_ostream<_CharT, _Traits>& __os,
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const mersenne_twister<_UIntType, __w, __n, __m,
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__r, __a, __u, __s, __b, __t, __c, __l>& __x);
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template<class _UIntType, int __w, int __n, int __m, int __r,
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_UIntType __a, int __u, int __s, _UIntType __b, int __t,
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_UIntType __c, int __l,
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typename _CharT, typename _Traits>
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std::basic_istream<_CharT, _Traits>&
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operator>>(std::basic_istream<_CharT, _Traits>& __is,
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mersenne_twister<_UIntType, __w, __n, __m,
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__r, __a, __u, __s, __b, __t, __c, __l>& __x);
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template<class _UIntType, int __w, int __n, int __m, int __r,
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_UIntType __a, int __u, int __s, _UIntType __b, int __t,
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_UIntType __c, int __l>
|
|
class mersenne_twister
|
|
{
|
|
__glibcxx_class_requires(_UIntType, _UnsignedIntegerConcept)
|
|
|
|
public:
|
|
// types
|
|
typedef _UIntType result_type;
|
|
|
|
// parameter values
|
|
static const int word_size = __w;
|
|
static const int state_size = __n;
|
|
static const int shift_size = __m;
|
|
static const int mask_bits = __r;
|
|
static const _UIntType parameter_a = __a;
|
|
static const int output_u = __u;
|
|
static const int output_s = __s;
|
|
static const _UIntType output_b = __b;
|
|
static const int output_t = __t;
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|
static const _UIntType output_c = __c;
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|
static const int output_l = __l;
|
|
|
|
// constructors and member function
|
|
mersenne_twister()
|
|
{ seed(); }
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|
|
|
explicit
|
|
mersenne_twister(unsigned long __value)
|
|
{ seed(__value); }
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|
|
|
template<class _Gen>
|
|
mersenne_twister(_Gen& __g)
|
|
{ seed(__g); }
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|
|
|
void
|
|
seed()
|
|
{ seed(5489UL); }
|
|
|
|
void
|
|
seed(unsigned long __value);
|
|
|
|
template<class _Gen>
|
|
void
|
|
seed(_Gen& __g)
|
|
{ seed(__g, typename is_fundamental<_Gen>::type()); }
|
|
|
|
result_type
|
|
min() const
|
|
{ return 0; };
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|
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|
result_type
|
|
max() const
|
|
{ return _Shift<_UIntType, __w>::__value - 1; }
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|
|
|
result_type
|
|
operator()();
|
|
|
|
/**
|
|
* Compares two % mersenne_twister random number generator objects of
|
|
* the same type for equality.
|
|
*
|
|
* @param __lhs A % mersenne_twister random number generator object.
|
|
* @param __rhs Another % mersenne_twister random number generator
|
|
* object.
|
|
*
|
|
* @returns true if the two objects are equal, false otherwise.
|
|
*/
|
|
friend bool
|
|
operator==(const mersenne_twister& __lhs,
|
|
const mersenne_twister& __rhs)
|
|
{ return std::equal(__lhs._M_x, __lhs._M_x + state_size, __rhs._M_x); }
|
|
|
|
/**
|
|
* Compares two % mersenne_twister random number generator objects of
|
|
* the same type for inequality.
|
|
*
|
|
* @param __lhs A % mersenne_twister random number generator object.
|
|
* @param __rhs Another % mersenne_twister random number generator
|
|
* object.
|
|
*
|
|
* @returns true if the two objects are not equal, false otherwise.
|
|
*/
|
|
friend bool
|
|
operator!=(const mersenne_twister& __lhs,
|
|
const mersenne_twister& __rhs)
|
|
{ return !(__lhs == __rhs); }
|
|
|
|
/**
|
|
* Inserts the current state of a % mersenne_twister random number
|
|
* generator engine @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A % mersenne_twister random number generator engine.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<class _UIntType1, int __w1, int __n1, int __m1, int __r1,
|
|
_UIntType1 __a1, int __u1, int __s1, _UIntType1 __b1, int __t1,
|
|
_UIntType1 __c1, int __l1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const mersenne_twister<_UIntType1, __w1, __n1, __m1, __r1,
|
|
__a1, __u1, __s1, __b1, __t1, __c1, __l1>& __x);
|
|
|
|
/**
|
|
* Extracts the current state of a % mersenne_twister random number
|
|
* generator engine @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A % mersenne_twister random number generator engine.
|
|
*
|
|
* @returns The input stream with the state of @p __x extracted or in
|
|
* an error state.
|
|
*/
|
|
template<class _UIntType1, int __w1, int __n1, int __m1, int __r1,
|
|
_UIntType1 __a1, int __u1, int __s1, _UIntType1 __b1, int __t1,
|
|
_UIntType1 __c1, int __l1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
mersenne_twister<_UIntType1, __w1, __n1, __m1, __r1,
|
|
__a1, __u1, __s1, __b1, __t1, __c1, __l1>& __x);
|
|
|
|
private:
|
|
template<class _Gen>
|
|
void
|
|
seed(_Gen& __g, true_type)
|
|
{ return seed(static_cast<unsigned long>(__g)); }
|
|
|
|
template<class _Gen>
|
|
void
|
|
seed(_Gen& __g, false_type);
|
|
|
|
private:
|
|
_UIntType _M_x[state_size];
|
|
int _M_p;
|
|
};
|
|
|
|
/**
|
|
* The classic Mersenne Twister.
|
|
*
|
|
* Reference:
|
|
* M. Matsumoto and T. Nishimura, "Mersenne Twister: A 623-Dimensionally
|
|
* Equidistributed Uniform Pseudo-Random Number Generator", ACM Transactions
|
|
* on Modeling and Computer Simulation, Vol. 8, No. 1, January 1998, pp 3-30.
|
|
*/
|
|
typedef mersenne_twister<
|
|
unsigned long, 32, 624, 397, 31,
|
|
0x9908b0dful, 11, 7,
|
|
0x9d2c5680ul, 15,
|
|
0xefc60000ul, 18
|
|
> mt19937;
|
|
|
|
|
|
/**
|
|
* @brief The Marsaglia-Zaman generator.
|
|
*
|
|
* This is a model of a Generalized Fibonacci discrete random number
|
|
* generator, sometimes referred to as the SWC generator.
|
|
*
|
|
* A discrete random number generator that produces pseudorandom numbers using
|
|
* @f$x_{i}\leftarrow(x_{i - s} - x_{i - r} - carry_{i-1}) \bmod m @f$.
|
|
*
|
|
* The size of the state is @f$ r @f$
|
|
* and the maximum period of the generator is @f$ m^r - m^s -1 @f$.
|
|
*
|
|
* N1688[4.13] says "the template parameter _IntType shall denote an integral
|
|
* type large enough to store values up to m."
|
|
*
|
|
* @if maint
|
|
* @var _M_x The state of te generator. This is a ring buffer.
|
|
* @var _M_carry The carry.
|
|
* @var _M_p Current index of x(i - r).
|
|
* @endif
|
|
*/
|
|
template<typename _IntType, _IntType __m, int __s, int __r>
|
|
class subtract_with_carry;
|
|
|
|
template<typename _IntType, _IntType __m, int __s, int __r,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const subtract_with_carry<_IntType, __m, __s, __r>& __x);
|
|
|
|
template<typename _IntType, _IntType __m, int __s, int __r,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
subtract_with_carry<_IntType, __m, __s, __r>& __x);
|
|
|
|
template<typename _IntType, _IntType __m, int __s, int __r>
|
|
class subtract_with_carry
|
|
{
|
|
__glibcxx_class_requires(_IntType, _IntegerConcept)
|
|
|
|
public:
|
|
/** The type of the generated random value. */
|
|
typedef _IntType result_type;
|
|
|
|
// parameter values
|
|
static const _IntType modulus = __m;
|
|
static const int long_lag = __r;
|
|
static const int short_lag = __s;
|
|
|
|
public:
|
|
/**
|
|
* Constructs a default-initialized % subtract_with_carry random number
|
|
* generator.
|
|
*/
|
|
subtract_with_carry()
|
|
{ this->seed(); }
|
|
|
|
/**
|
|
* Constructs an explicitly seeded % subtract_with_carry random number
|
|
* generator.
|
|
*/
|
|
explicit
|
|
subtract_with_carry(unsigned long __value)
|
|
{ this->seed(__value); }
|
|
|
|
/**
|
|
* Constructs a % subtract_with_carry random number generator seeded from
|
|
* the PAD iterated by [__first, last).
|
|
*/
|
|
template<class _Gen>
|
|
subtract_with_carry(_Gen& __g)
|
|
{ this->seed(__g); }
|
|
|
|
/**
|
|
* Seeds the initial state @f$ x_0 @f$ of the random number generator.
|
|
*
|
|
* @note This implementation follows the tr1 specification but will
|
|
* obviously not work correctly on all platforms, since it has hardcoded
|
|
* values that may overflow ints on some platforms.
|
|
*
|
|
* N1688[4.19] modifies this as follows.
|
|
* If @p __value == 0, sets value to 19780503. In any case, with a linear
|
|
* congruential generator lcg(i) having parameters @f$ m_{lcg} =
|
|
* 2147483563, a_{lcg} = 40014, c_{lcg} = 0, and lcg(0) = value @f$, sets
|
|
* @f$ x_{-r} \dots x_{-1} @f$ to
|
|
* @f$ lcg(1) \bmod m \dots lcg(r) \bmod m @f$ respectively.
|
|
* If @f$ x_{-1} = 0 @f$ set carry to 1, otherwise sets carry to 0.
|
|
*/
|
|
void
|
|
seed(unsigned long __value = 19780503);
|
|
|
|
/**
|
|
* Seeds the initial state @f$ x_0 @f$ of the % subtract_with_carry
|
|
* random number generator.
|
|
*/
|
|
template<class _Gen>
|
|
void
|
|
seed(_Gen& __g)
|
|
{ seed(__g, typename is_fundamental<_Gen>::type()); }
|
|
|
|
/**
|
|
* Gets the inclusive minimum value of the range of random integers
|
|
* returned by this generator.
|
|
*/
|
|
result_type
|
|
min() const
|
|
{ return 0; }
|
|
|
|
/**
|
|
* Gets the inclusive maximum value of the range of random integers
|
|
* returned by this generator.
|
|
*/
|
|
result_type
|
|
max() const
|
|
{ return this->modulus - 1; }
|
|
|
|
/**
|
|
* Gets the next random number in the sequence.
|
|
*/
|
|
result_type
|
|
operator()();
|
|
|
|
/**
|
|
* Compares two % subtract_with_carry random number generator objects of
|
|
* the same type for equality.
|
|
*
|
|
* @param __lhs A % subtract_with_carry random number generator object.
|
|
* @param __rhs Another % subtract_with_carry random number generator
|
|
* object.
|
|
*
|
|
* @returns true if the two objects are equal, false otherwise.
|
|
*/
|
|
friend bool
|
|
operator==(const subtract_with_carry& __lhs,
|
|
const subtract_with_carry& __rhs)
|
|
{ return std::equal(__lhs._M_x, __lhs._M_x + long_lag, __rhs._M_x); }
|
|
|
|
/**
|
|
* Compares two % subtract_with_carry random number generator objects of
|
|
* the same type for inequality.
|
|
*
|
|
* @param __lhs A % subtract_with_carry random number generator object.
|
|
* @param __rhs Another % subtract_with_carry random number generator
|
|
* object.
|
|
*
|
|
* @returns true if the two objects are not equal, false otherwise.
|
|
*/
|
|
friend bool
|
|
operator!=(const subtract_with_carry& __lhs,
|
|
const subtract_with_carry& __rhs)
|
|
{ return !(__lhs == __rhs); }
|
|
|
|
/**
|
|
* Inserts the current state of a % subtract_with_carry random number
|
|
* generator engine @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A % subtract_with_carry random number generator engine.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _IntType1, _IntType1 __m1, int __s1, int __r1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const subtract_with_carry<_IntType1, __m1, __s1,
|
|
__r1>& __x);
|
|
|
|
/**
|
|
* Extracts the current state of a % subtract_with_carry random number
|
|
* generator engine @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A % subtract_with_carry random number generator engine.
|
|
*
|
|
* @returns The input stream with the state of @p __x extracted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _IntType1, _IntType1 __m1, int __s1, int __r1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
subtract_with_carry<_IntType1, __m1, __s1, __r1>& __x);
|
|
|
|
private:
|
|
template<class _Gen>
|
|
void
|
|
seed(_Gen& __g, true_type)
|
|
{ return seed(static_cast<unsigned long>(__g)); }
|
|
|
|
template<class _Gen>
|
|
void
|
|
seed(_Gen& __g, false_type);
|
|
|
|
private:
|
|
int _M_p;
|
|
result_type _M_x[long_lag];
|
|
result_type _M_carry;
|
|
};
|
|
|
|
|
|
/**
|
|
* Produces random numbers from some base engine by discarding blocks of
|
|
* data.
|
|
*
|
|
* 0 <= @p __r <= @p __p
|
|
*/
|
|
template<class _UniformRandomNumberGenerator, int __p, int __r>
|
|
class discard_block;
|
|
|
|
template<class _UniformRandomNumberGenerator, int __p, int __r,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const discard_block<_UniformRandomNumberGenerator,
|
|
__p, __r>& __x);
|
|
|
|
template<class _UniformRandomNumberGenerator, int __p, int __r,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
discard_block<_UniformRandomNumberGenerator, __p, __r>& __x);
|
|
|
|
template<class _UniformRandomNumberGenerator, int __p, int __r>
|
|
class discard_block
|
|
{
|
|
// __glibcxx_class_requires(typename base_type::result_type,
|
|
// ArithmeticTypeConcept)
|
|
|
|
public:
|
|
/** The type of the underlying generator engine. */
|
|
typedef _UniformRandomNumberGenerator base_type;
|
|
/** The type of the generated random value. */
|
|
typedef typename base_type::result_type result_type;
|
|
|
|
// parameter values
|
|
static const int block_size = __p;
|
|
static const int used_block = __r;
|
|
|
|
/**
|
|
* Constructs a default %discard_block engine.
|
|
*
|
|
* The underlying engine is default constructed as well.
|
|
*/
|
|
discard_block()
|
|
: _M_n(0) { }
|
|
|
|
/**
|
|
* Copy constructs a %discard_block engine.
|
|
*
|
|
* Copies an existing base class random number geenerator.
|
|
* @param rng An existing (base class) engine object.
|
|
*/
|
|
explicit
|
|
discard_block(const base_type& __rng)
|
|
: _M_b(__rng), _M_n(0) { }
|
|
|
|
/**
|
|
* Seed constructs a %discard_block engine.
|
|
*
|
|
* Constructs the underlying generator engine seeded with @p __s.
|
|
* @param __s A seed value for the base class engine.
|
|
*/
|
|
explicit
|
|
discard_block(unsigned long __s)
|
|
: _M_b(__s), _M_n(0) { }
|
|
|
|
/**
|
|
* Generator constructs a %discard_block engine.
|
|
*
|
|
* @param __g A seed generator function.
|
|
*/
|
|
template<class _Gen>
|
|
discard_block(_Gen& __g)
|
|
: _M_b(__g), _M_n(0) { }
|
|
|
|
/**
|
|
* Reseeds the %discard_block object with the default seed for the
|
|
* underlying base class generator engine.
|
|
*/
|
|
void seed()
|
|
{
|
|
_M_b.seed();
|
|
_M_n = 0;
|
|
}
|
|
|
|
/**
|
|
* Reseeds the %discard_block object with the given seed generator
|
|
* function.
|
|
* @param __g A seed generator function.
|
|
*/
|
|
template<class _Gen>
|
|
void seed(_Gen& __g)
|
|
{
|
|
_M_b.seed(__g);
|
|
_M_n = 0;
|
|
}
|
|
|
|
/**
|
|
* Gets a const reference to the underlying generator engine object.
|
|
*/
|
|
const base_type&
|
|
base() const
|
|
{ return _M_b; }
|
|
|
|
/**
|
|
* Gets the minimum value in the generated random number range.
|
|
*/
|
|
result_type
|
|
min() const
|
|
{ return _M_b.min(); }
|
|
|
|
/**
|
|
* Gets the maximum value in the generated random number range.
|
|
*/
|
|
result_type
|
|
max() const
|
|
{ return _M_b.max(); }
|
|
|
|
/**
|
|
* Gets the next value in the generated random number sequence.
|
|
*/
|
|
result_type
|
|
operator()();
|
|
|
|
/**
|
|
* Compares two %discard_block random number generator objects of
|
|
* the same type for equality.
|
|
*
|
|
* @param __lhs A %discard_block random number generator object.
|
|
* @param __rhs Another %discard_block random number generator
|
|
* object.
|
|
*
|
|
* @returns true if the two objects are equal, false otherwise.
|
|
*/
|
|
friend bool
|
|
operator==(const discard_block& __lhs, const discard_block& __rhs)
|
|
{ return (__lhs._M_b == __rhs._M_b) && (__lhs._M_n == __rhs._M_n); }
|
|
|
|
/**
|
|
* Compares two %discard_block random number generator objects of
|
|
* the same type for inequality.
|
|
*
|
|
* @param __lhs A %discard_block random number generator object.
|
|
* @param __rhs Another %discard_block random number generator
|
|
* object.
|
|
*
|
|
* @returns true if the two objects are not equal, false otherwise.
|
|
*/
|
|
friend bool
|
|
operator!=(const discard_block& __lhs, const discard_block& __rhs)
|
|
{ return !(__lhs == __rhs); }
|
|
|
|
/**
|
|
* Inserts the current state of a %discard_block random number
|
|
* generator engine @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %discard_block random number generator engine.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<class _UniformRandomNumberGenerator1, int __p1, int __r1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const discard_block<_UniformRandomNumberGenerator1,
|
|
__p1, __r1>& __x);
|
|
|
|
/**
|
|
* Extracts the current state of a % subtract_with_carry random number
|
|
* generator engine @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %discard_block random number generator engine.
|
|
*
|
|
* @returns The input stream with the state of @p __x extracted or in
|
|
* an error state.
|
|
*/
|
|
template<class _UniformRandomNumberGenerator1, int __p1, int __r1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
discard_block<_UniformRandomNumberGenerator1,
|
|
__p1, __r1>& __x);
|
|
|
|
private:
|
|
base_type _M_b;
|
|
int _M_n;
|
|
};
|
|
|
|
|
|
/**
|
|
* James's luxury-level-3 integer adaptation of Luescher's generator.
|
|
*/
|
|
typedef discard_block<
|
|
subtract_with_carry<unsigned long, (1 << 24), 10, 24>,
|
|
223,
|
|
24
|
|
> ranlux3;
|
|
|
|
/**
|
|
* James's luxury-level-4 integer adaptation of Luescher's generator.
|
|
*/
|
|
typedef discard_block<
|
|
subtract_with_carry<unsigned long, (1 << 24), 10, 24>,
|
|
389,
|
|
24
|
|
> ranlux4;
|
|
|
|
|
|
/**
|
|
* A random number generator adaptor class that combines two random number
|
|
* generator engines into a single output sequence.
|
|
*/
|
|
template<class _UniformRandomNumberGenerator1, int __s1,
|
|
class _UniformRandomNumberGenerator2, int __s2>
|
|
class xor_combine;
|
|
|
|
template<class _UniformRandomNumberGenerator1, int __s1,
|
|
class _UniformRandomNumberGenerator2, int __s2,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const xor_combine<_UniformRandomNumberGenerator1, __s1,
|
|
_UniformRandomNumberGenerator2, __s2>& __x);
|
|
|
|
template<class _UniformRandomNumberGenerator1, int __s1,
|
|
class _UniformRandomNumberGenerator2, int __s2,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
xor_combine<_UniformRandomNumberGenerator1, __s1,
|
|
_UniformRandomNumberGenerator2, __s2>& __x);
|
|
|
|
template<class _UniformRandomNumberGenerator1, int __s1,
|
|
class _UniformRandomNumberGenerator2, int __s2>
|
|
class xor_combine
|
|
{
|
|
// __glibcxx_class_requires(typename _UniformRandomNumberGenerator1::
|
|
// result_type, ArithmeticTypeConcept)
|
|
// __glibcxx_class_requires(typename _UniformRandomNumberGenerator2::
|
|
// result_type, ArithmeticTypeConcept)
|
|
|
|
public:
|
|
/** The type of the the first underlying generator engine. */
|
|
typedef _UniformRandomNumberGenerator1 base1_type;
|
|
/** The type of the the second underlying generator engine. */
|
|
typedef _UniformRandomNumberGenerator2 base2_type;
|
|
|
|
private:
|
|
typedef typename base1_type::result_type _Result_type1;
|
|
typedef typename base2_type::result_type _Result_type2;
|
|
|
|
public:
|
|
/** The type of the generated random value. */
|
|
typedef typename _Select<(sizeof(_Result_type1) > sizeof(_Result_type2)),
|
|
_Result_type1, _Result_type2>::_Type result_type;
|
|
|
|
// parameter values
|
|
static const int shift1 = __s1;
|
|
static const int shift2 = __s2;
|
|
|
|
// constructors and member function
|
|
xor_combine() { }
|
|
|
|
xor_combine(const base1_type& __rng1, const base2_type& __rng2)
|
|
: _M_b1(__rng1), _M_b2(__rng2) { }
|
|
|
|
xor_combine(unsigned long __s)
|
|
: _M_b1(__s), _M_b2(__s + 1) { }
|
|
|
|
template<class _Gen>
|
|
xor_combine(_Gen& __g)
|
|
: _M_b1(__g), _M_b2(__g) { }
|
|
|
|
void
|
|
seed()
|
|
{
|
|
_M_b1.seed();
|
|
_M_b2.seed();
|
|
}
|
|
|
|
template<class _Gen>
|
|
void
|
|
seed(_Gen& __g)
|
|
{
|
|
_M_b1.seed(__g);
|
|
_M_b2.seed(__g);
|
|
}
|
|
|
|
const base1_type&
|
|
base1() const
|
|
{ return _M_b1; }
|
|
|
|
const base2_type&
|
|
base2() const
|
|
{ return _M_b2; }
|
|
|
|
result_type
|
|
min() const
|
|
{ return _M_b1.min() ^ _M_b2.min(); }
|
|
|
|
result_type
|
|
max() const
|
|
{ return _M_b1.max() | _M_b2.max(); }
|
|
|
|
/**
|
|
* Gets the next random number in the sequence.
|
|
*/
|
|
result_type
|
|
operator()()
|
|
{ return ((_M_b1() << shift1) ^ (_M_b2() << shift2)); }
|
|
|
|
/**
|
|
* Compares two %xor_combine random number generator objects of
|
|
* the same type for equality.
|
|
*
|
|
* @param __lhs A %xor_combine random number generator object.
|
|
* @param __rhs Another %xor_combine random number generator
|
|
* object.
|
|
*
|
|
* @returns true if the two objects are equal, false otherwise.
|
|
*/
|
|
friend bool
|
|
operator==(const xor_combine& __lhs, const xor_combine& __rhs)
|
|
{
|
|
return (__lhs.base1() == __rhs.base1())
|
|
&& (__lhs.base2() == __rhs.base2());
|
|
}
|
|
|
|
/**
|
|
* Compares two %xor_combine random number generator objects of
|
|
* the same type for inequality.
|
|
*
|
|
* @param __lhs A %xor_combine random number generator object.
|
|
* @param __rhs Another %xor_combine random number generator
|
|
* object.
|
|
*
|
|
* @returns true if the two objects are not equal, false otherwise.
|
|
*/
|
|
friend bool
|
|
operator!=(const xor_combine& __lhs, const xor_combine& __rhs)
|
|
{ return !(__lhs == __rhs); }
|
|
|
|
/**
|
|
* Inserts the current state of a %xor_combine random number
|
|
* generator engine @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %xor_combine random number generator engine.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<class _UniformRandomNumberGenerator11, int __s11,
|
|
class _UniformRandomNumberGenerator21, int __s21,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const xor_combine<_UniformRandomNumberGenerator11, __s11,
|
|
_UniformRandomNumberGenerator21, __s21>& __x);
|
|
|
|
/**
|
|
* Extracts the current state of a %xor_combine random number
|
|
* generator engine @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %xor_combine random number generator engine.
|
|
*
|
|
* @returns The input stream with the state of @p __x extracted or in
|
|
* an error state.
|
|
*/
|
|
template<class _UniformRandomNumberGenerator11, int __s11,
|
|
class _UniformRandomNumberGenerator21, int __s21,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
xor_combine<_UniformRandomNumberGenerator11, __s11,
|
|
_UniformRandomNumberGenerator21, __s21>& __x);
|
|
|
|
private:
|
|
base1_type _M_b1;
|
|
base2_type _M_b2;
|
|
};
|
|
|
|
|
|
/**
|
|
* A standard interface to a platform-specific non-deterministic random number
|
|
* generator (if any are available).
|
|
*/
|
|
class random_device
|
|
{
|
|
public:
|
|
// types
|
|
typedef unsigned int result_type;
|
|
|
|
// constructors, destructors and member functions
|
|
|
|
#ifdef _GLIBCXX_USE_RANDOM_TR1
|
|
|
|
explicit
|
|
random_device(const std::string& __token = "/dev/urandom")
|
|
{
|
|
if ((__token != "/dev/urandom" && __token != "/dev/random")
|
|
|| !_M_filebuf.open(__token.c_str(),
|
|
std::ios_base::in | std::ios_base::binary))
|
|
std::__throw_runtime_error(__N("random_device::"
|
|
"random_device(const std::string&)"));
|
|
}
|
|
|
|
~random_device()
|
|
{ _M_filebuf.close(); }
|
|
|
|
#else
|
|
|
|
explicit
|
|
random_device(const std::string& __token = "mt19937")
|
|
: _M_mt(_M_strtoul(__token)) { }
|
|
|
|
private:
|
|
static unsigned long
|
|
_M_strtoul(const std::string& __str)
|
|
{
|
|
unsigned long __ret = 5489UL;
|
|
if (__str != "mt19937")
|
|
{
|
|
const char* __nptr = __str.c_str();
|
|
char* __endptr;
|
|
__ret = std::strtoul(__nptr, &__endptr, 0);
|
|
if (*__nptr == '\0' || *__endptr != '\0')
|
|
std::__throw_runtime_error(__N("random_device::_M_strtoul"
|
|
"(const std::string&)"));
|
|
}
|
|
return __ret;
|
|
}
|
|
|
|
public:
|
|
|
|
#endif
|
|
|
|
result_type
|
|
min() const
|
|
{ return std::numeric_limits<result_type>::min(); }
|
|
|
|
result_type
|
|
max() const
|
|
{ return std::numeric_limits<result_type>::max(); }
|
|
|
|
double
|
|
entropy() const
|
|
{ return 0.0; }
|
|
|
|
result_type
|
|
operator()()
|
|
{
|
|
#ifdef _GLIBCXX_USE_RANDOM_TR1
|
|
result_type __ret;
|
|
_M_filebuf.sgetn(reinterpret_cast<char*>(&__ret), sizeof(result_type));
|
|
return __ret;
|
|
#else
|
|
return _M_mt();
|
|
#endif
|
|
}
|
|
|
|
private:
|
|
random_device(const random_device&);
|
|
void operator=(const random_device&);
|
|
|
|
#ifdef _GLIBCXX_USE_RANDOM_TR1
|
|
std::filebuf _M_filebuf;
|
|
#else
|
|
mt19937 _M_mt;
|
|
#endif
|
|
};
|
|
|
|
/* @} */ // group tr1_random_generators
|
|
|
|
/**
|
|
* @addtogroup tr1_random_distributions Random Number Distributions
|
|
* @ingroup tr1_random
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @addtogroup tr1_random_distributions_discrete Discrete Distributions
|
|
* @ingroup tr1_random_distributions
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Uniform discrete distribution for random numbers.
|
|
* A discrete random distribution on the range @f$[min, max]@f$ with equal
|
|
* probability throughout the range.
|
|
*/
|
|
template<typename _IntType = int>
|
|
class uniform_int;
|
|
|
|
template<typename _IntType, typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const uniform_int<_IntType>& __x);
|
|
|
|
template<typename _IntType, typename _CharT, typename _Traits>
|
|
std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
uniform_int<_IntType>& __x);
|
|
|
|
template<typename _IntType>
|
|
class uniform_int
|
|
{
|
|
__glibcxx_class_requires(_IntType, _IntegerConcept)
|
|
|
|
public:
|
|
/** The type of the parameters of the distribution. */
|
|
typedef _IntType input_type;
|
|
/** The type of the range of the distribution. */
|
|
typedef _IntType result_type;
|
|
|
|
public:
|
|
/**
|
|
* Constructs a uniform distribution object.
|
|
*/
|
|
explicit
|
|
uniform_int(_IntType __min = 0, _IntType __max = 9)
|
|
: _M_min(__min), _M_max(__max)
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT(_M_min <= _M_max);
|
|
}
|
|
|
|
/**
|
|
* Gets the inclusive lower bound of the distribution range.
|
|
*/
|
|
result_type
|
|
min() const
|
|
{ return _M_min; }
|
|
|
|
/**
|
|
* Gets the inclusive upper bound of the distribution range.
|
|
*/
|
|
result_type
|
|
max() const
|
|
{ return _M_max; }
|
|
|
|
/**
|
|
* Resets the distribution state.
|
|
*
|
|
* Does nothing for the uniform integer distribution.
|
|
*/
|
|
void
|
|
reset() { }
|
|
|
|
/**
|
|
* Gets a uniformly distributed random number in the range
|
|
* @f$(min, max)@f$.
|
|
*/
|
|
template<typename _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng)
|
|
{ return (__urng() % (_M_max - _M_min + 1)) + _M_min; }
|
|
|
|
/**
|
|
* Gets a uniform random number in the range @f$[0, n)@f$.
|
|
*
|
|
* This function is aimed at use with std::random_shuffle.
|
|
*/
|
|
template<typename _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng, result_type __n)
|
|
{ return __urng() % __n; }
|
|
|
|
/**
|
|
* Inserts a %uniform_int random number distribution @p __x into the
|
|
* output stream @p os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %uniform_int random number distribution.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _IntType1, typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const uniform_int<_IntType1>& __x);
|
|
|
|
/**
|
|
* Extracts a %unform_int random number distribution
|
|
* @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %uniform_int random number generator engine.
|
|
*
|
|
* @returns The input stream with @p __x extracted or in an error state.
|
|
*/
|
|
template<typename _IntType1, typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
uniform_int<_IntType1>& __x);
|
|
|
|
private:
|
|
_IntType _M_min;
|
|
_IntType _M_max;
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief A Bernoulli random number distribution.
|
|
*
|
|
* Generates a sequence of true and false values with likelihood @f$ p @f$
|
|
* that true will come up and @f$ (1 - p) @f$ that false will appear.
|
|
*/
|
|
class bernoulli_distribution;
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const bernoulli_distribution& __x);
|
|
|
|
class bernoulli_distribution
|
|
{
|
|
public:
|
|
typedef int input_type;
|
|
typedef bool result_type;
|
|
|
|
public:
|
|
/**
|
|
* Constructs a Bernoulli distribution with likelihood @p p.
|
|
*
|
|
* @param __p [IN] The likelihood of a true result being returned. Must
|
|
* be in the interval @f$ [0, 1] @f$.
|
|
*/
|
|
explicit
|
|
bernoulli_distribution(double __p = 0.5)
|
|
: _M_p(__p)
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT((_M_p >= 0.0) && (_M_p <= 1.0));
|
|
}
|
|
|
|
/**
|
|
* Gets the @p p parameter of the distribution.
|
|
*/
|
|
double
|
|
p() const
|
|
{ return _M_p; }
|
|
|
|
/**
|
|
* Resets the distribution state.
|
|
*
|
|
* Does nothing for a bernoulli distribution.
|
|
*/
|
|
void
|
|
reset() { }
|
|
|
|
/**
|
|
* Gets the next value in the Bernoullian sequence.
|
|
*/
|
|
template<class _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng)
|
|
{
|
|
if (__urng() < _M_p)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Inserts a %bernoulli_distribution random number distribution
|
|
* @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %bernoulli_distribution random number distribution.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const bernoulli_distribution& __x);
|
|
|
|
/**
|
|
* Extracts a %bernoulli_distribution random number distribution
|
|
* @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %bernoulli_distribution random number generator engine.
|
|
*
|
|
* @returns The input stream with @p __x extracted or in an error state.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
bernoulli_distribution& __x)
|
|
{ return __is >> __x._M_p; }
|
|
|
|
protected:
|
|
double _M_p;
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief A discrete geometric random number distribution.
|
|
*
|
|
* The formula for the geometric probability mass function is
|
|
* @f$ p(i) = (1 - p)p^{i-1} @f$ where @f$ p @f$ is the parameter of the
|
|
* distribution.
|
|
*/
|
|
template<typename _IntType = int, typename _RealType = double>
|
|
class geometric_distribution;
|
|
|
|
template<typename _IntType, typename _RealType,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const geometric_distribution<_IntType, _RealType>& __x);
|
|
|
|
template<typename _IntType, typename _RealType>
|
|
class geometric_distribution
|
|
{
|
|
public:
|
|
// types
|
|
typedef _RealType input_type;
|
|
typedef _IntType result_type;
|
|
|
|
// constructors and member function
|
|
explicit
|
|
geometric_distribution(const _RealType& __p = _RealType(0.5))
|
|
: _M_p(__p), _M_log_p(std::log(_M_p))
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT((_M_p >= 0.0) && (_M_p <= 1.0));
|
|
}
|
|
|
|
/**
|
|
* Gets the distribution parameter @p p.
|
|
*/
|
|
_RealType
|
|
p() const
|
|
{ return _M_p; }
|
|
|
|
void
|
|
reset() { }
|
|
|
|
template<class _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng)
|
|
{ return result_type(std::ceil(std::log(__urng()) / _M_log_p)); }
|
|
|
|
/**
|
|
* Inserts a %geometric_distribution random number distribution
|
|
* @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %geometric_distribution random number distribution.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _IntType1, typename _RealType1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const geometric_distribution<_IntType1, _RealType1>& __x);
|
|
|
|
/**
|
|
* Extracts a %geometric_distribution random number distribution
|
|
* @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %geometric_distribution random number generator engine.
|
|
*
|
|
* @returns The input stream with @p __x extracted or in an error state.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
geometric_distribution& __x)
|
|
{
|
|
__is >> __x._M_p;
|
|
__x._M_log_p = std::log(__x._M_p);
|
|
return __is;
|
|
}
|
|
|
|
protected:
|
|
_RealType _M_p;
|
|
_RealType _M_log_p;
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief A discrete Poisson random number distribution.
|
|
*
|
|
* The formula for the poisson probability mass function is
|
|
* @f$ p(i) = \frac{mean^i}{i!} e^{-mean} @f$ where @f$ mean @f$ is the
|
|
* parameter of the distribution.
|
|
*/
|
|
template<typename _IntType = int, typename _RealType = double>
|
|
class poisson_distribution;
|
|
|
|
template<typename _IntType, typename _RealType,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const poisson_distribution<_IntType, _RealType>& __x);
|
|
|
|
template<typename _IntType, typename _RealType,
|
|
typename _CharT, typename _Traits>
|
|
std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
poisson_distribution<_IntType, _RealType>& __x);
|
|
|
|
template<typename _IntType, typename _RealType>
|
|
class poisson_distribution
|
|
{
|
|
public:
|
|
// types
|
|
typedef _RealType input_type;
|
|
typedef _IntType result_type;
|
|
|
|
// constructors and member function
|
|
explicit
|
|
poisson_distribution(const _RealType& __mean = _RealType(1));
|
|
|
|
/**
|
|
* Gets the distribution parameter @p mean.
|
|
*/
|
|
_RealType
|
|
mean() const
|
|
{ return _M_mean; }
|
|
|
|
void
|
|
reset() { }
|
|
|
|
template<class _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng);
|
|
|
|
/**
|
|
* Inserts a %poisson_distribution random number distribution
|
|
* @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %poisson_distribution random number distribution.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _IntType1, typename _RealType1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const poisson_distribution<_IntType1, _RealType1>& __x);
|
|
|
|
/**
|
|
* Extracts a %poisson_distribution random number distribution
|
|
* @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %poisson_distribution random number generator engine.
|
|
*
|
|
* @returns The input stream with @p __x extracted or in an error state.
|
|
*/
|
|
template<typename _IntType1, typename _RealType1,
|
|
typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
poisson_distribution<_IntType1, _RealType1>& __x);
|
|
|
|
protected:
|
|
_RealType _M_mean;
|
|
|
|
_RealType _M_lm_thr;
|
|
#if _GLIBCXX_USE_C99_MATH_TR1
|
|
_RealType _M_lfm, _M_sm, _M_d, _M_scx4, _M_2cx, _M_c2b, _M_cb;
|
|
#endif
|
|
bool _M_large;
|
|
};
|
|
|
|
/* @} */ // group tr1_random_distributions_discrete
|
|
|
|
/**
|
|
* @addtogroup tr1_random_distributions_continuous Continuous Distributions
|
|
* @ingroup tr1_random_distributions
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Uniform continuous distribution for random numbers.
|
|
*
|
|
* A continuous random distribution on the range [min, max) with equal
|
|
* probability throughout the range. The URNG should be real-valued and
|
|
* deliver number in the range [0, 1).
|
|
*/
|
|
template<typename _RealType = double>
|
|
class uniform_real;
|
|
|
|
template<typename _RealType, typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const uniform_real<_RealType>& __x);
|
|
|
|
template<typename _RealType, typename _CharT, typename _Traits>
|
|
std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
uniform_real<_RealType>& __x);
|
|
|
|
template<typename _RealType>
|
|
class uniform_real
|
|
{
|
|
public:
|
|
// types
|
|
typedef _RealType input_type;
|
|
typedef _RealType result_type;
|
|
|
|
public:
|
|
/**
|
|
* Constructs a uniform_real object.
|
|
*
|
|
* @param __min [IN] The lower bound of the distribution.
|
|
* @param __max [IN] The upper bound of the distribution.
|
|
*/
|
|
explicit
|
|
uniform_real(_RealType __min = _RealType(0),
|
|
_RealType __max = _RealType(1))
|
|
: _M_min(__min), _M_max(__max)
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT(_M_min <= _M_max);
|
|
}
|
|
|
|
result_type
|
|
min() const
|
|
{ return _M_min; }
|
|
|
|
result_type
|
|
max() const
|
|
{ return _M_max; }
|
|
|
|
void
|
|
reset() { }
|
|
|
|
template<class _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng)
|
|
{ return (__urng() * (_M_max - _M_min)) + _M_min; }
|
|
|
|
/**
|
|
* Inserts a %uniform_real random number distribution @p __x into the
|
|
* output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %uniform_real random number distribution.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _RealType1, typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const uniform_real<_RealType1>& __x);
|
|
|
|
/**
|
|
* Extracts a %unform_real random number distribution
|
|
* @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %uniform_real random number generator engine.
|
|
*
|
|
* @returns The input stream with @p __x extracted or in an error state.
|
|
*/
|
|
template<typename _RealType1, typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
uniform_real<_RealType1>& __x);
|
|
|
|
protected:
|
|
_RealType _M_min;
|
|
_RealType _M_max;
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief An exponential continuous distribution for random numbers.
|
|
*
|
|
* The formula for the exponential probability mass function is
|
|
* @f$ p(x) = \lambda e^{-\lambda x} @f$.
|
|
*
|
|
* <table border=1 cellpadding=10 cellspacing=0>
|
|
* <caption align=top>Distribution Statistics</caption>
|
|
* <tr><td>Mean</td><td>@f$ \frac{1}{\lambda} @f$</td></tr>
|
|
* <tr><td>Median</td><td>@f$ \frac{\ln 2}{\lambda} @f$</td></tr>
|
|
* <tr><td>Mode</td><td>@f$ zero @f$</td></tr>
|
|
* <tr><td>Range</td><td>@f$[0, \infty]@f$</td></tr>
|
|
* <tr><td>Standard Deviation</td><td>@f$ \frac{1}{\lambda} @f$</td></tr>
|
|
* </table>
|
|
*/
|
|
template<typename _RealType = double>
|
|
class exponential_distribution;
|
|
|
|
template<typename _RealType, typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const exponential_distribution<_RealType>& __x);
|
|
|
|
template<typename _RealType>
|
|
class exponential_distribution
|
|
{
|
|
public:
|
|
// types
|
|
typedef _RealType input_type;
|
|
typedef _RealType result_type;
|
|
|
|
public:
|
|
/**
|
|
* Constructs an exponential distribution with inverse scale parameter
|
|
* @f$ \lambda @f$.
|
|
*/
|
|
explicit
|
|
exponential_distribution(const result_type& __lambda = result_type(1))
|
|
: _M_lambda(__lambda)
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT(_M_lambda > 0);
|
|
}
|
|
|
|
/**
|
|
* Gets the inverse scale parameter of the distribution.
|
|
*/
|
|
_RealType
|
|
lambda() const
|
|
{ return _M_lambda; }
|
|
|
|
/**
|
|
* Resets the distribution.
|
|
*
|
|
* Has no effect on exponential distributions.
|
|
*/
|
|
void
|
|
reset() { }
|
|
|
|
template<class _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng)
|
|
{ return -std::log(__urng()) / _M_lambda; }
|
|
|
|
/**
|
|
* Inserts a %exponential_distribution random number distribution
|
|
* @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %exponential_distribution random number distribution.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _RealType1, typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const exponential_distribution<_RealType1>& __x);
|
|
|
|
/**
|
|
* Extracts a %exponential_distribution random number distribution
|
|
* @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %exponential_distribution random number generator engine.
|
|
*
|
|
* @returns The input stream with @p __x extracted or in an error state.
|
|
*/
|
|
template<typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
exponential_distribution& __x)
|
|
{ return __is >> __x._M_lambda; }
|
|
|
|
private:
|
|
result_type _M_lambda;
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief A normal continuous distribution for random numbers.
|
|
*
|
|
* The formula for the normal probability mass function is
|
|
* @f$ p(x) = \frac{1}{\sigma \sqrt{2 \pi}}
|
|
* e^{- \frac{{x - mean}^ {2}}{2 \sigma ^ {2}} } @f$.
|
|
*/
|
|
template<typename _RealType = double>
|
|
class normal_distribution;
|
|
|
|
template<typename _RealType, typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const normal_distribution<_RealType>& __x);
|
|
|
|
template<typename _RealType, typename _CharT, typename _Traits>
|
|
std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
normal_distribution<_RealType>& __x);
|
|
|
|
template<typename _RealType>
|
|
class normal_distribution
|
|
{
|
|
public:
|
|
// types
|
|
typedef _RealType input_type;
|
|
typedef _RealType result_type;
|
|
|
|
public:
|
|
/**
|
|
* Constructs a normal distribution with parameters @f$ mean @f$ and
|
|
* @f$ \sigma @f$.
|
|
*/
|
|
explicit
|
|
normal_distribution(const result_type& __mean = result_type(0),
|
|
const result_type& __sigma = result_type(1))
|
|
: _M_mean(__mean), _M_sigma(__sigma), _M_saved_available(false)
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT(_M_sigma > 0);
|
|
}
|
|
|
|
/**
|
|
* Gets the mean of the distribution.
|
|
*/
|
|
_RealType
|
|
mean() const
|
|
{ return _M_mean; }
|
|
|
|
/**
|
|
* Gets the @f$ \sigma @f$ of the distribution.
|
|
*/
|
|
_RealType
|
|
sigma() const
|
|
{ return _M_sigma; }
|
|
|
|
/**
|
|
* Resets the distribution.
|
|
*/
|
|
void
|
|
reset()
|
|
{ _M_saved_available = false; }
|
|
|
|
template<class _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng);
|
|
|
|
/**
|
|
* Inserts a %normal_distribution random number distribution
|
|
* @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %normal_distribution random number distribution.
|
|
*
|
|
* @returns The output stream with the state of @p __x inserted or in
|
|
* an error state.
|
|
*/
|
|
template<typename _RealType1, typename _CharT, typename _Traits>
|
|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const normal_distribution<_RealType1>& __x);
|
|
|
|
/**
|
|
* Extracts a %normal_distribution random number distribution
|
|
* @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %normal_distribution random number generator engine.
|
|
*
|
|
* @returns The input stream with @p __x extracted or in an error state.
|
|
*/
|
|
template<typename _RealType1, typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
normal_distribution<_RealType1>& __x);
|
|
|
|
private:
|
|
result_type _M_mean;
|
|
result_type _M_sigma;
|
|
result_type _M_saved;
|
|
bool _M_saved_available;
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief A gamma continuous distribution for random numbers.
|
|
*
|
|
* The formula for the gamma probability mass function is
|
|
* @f$ p(x) = \frac{1}{\Gamma(\alpha)} x^{\alpha - 1} e^{-x} } @f$.
|
|
*/
|
|
template<typename _RealType = double>
|
|
class gamma_distribution;
|
|
|
|
template<typename _RealType, typename _CharT, typename _Traits>
|
|
std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const gamma_distribution<_RealType>& __x);
|
|
|
|
template<typename _RealType>
|
|
class gamma_distribution
|
|
{
|
|
public:
|
|
// types
|
|
typedef _RealType input_type;
|
|
typedef _RealType result_type;
|
|
|
|
public:
|
|
/**
|
|
* Constructs a gamma distribution with parameters @f$ \alpha @f$.
|
|
*/
|
|
explicit
|
|
gamma_distribution(const result_type& __alpha_val = result_type(1))
|
|
: _M_alpha(__alpha_val)
|
|
{
|
|
_GLIBCXX_DEBUG_ASSERT(_M_alpha > 0);
|
|
}
|
|
|
|
/**
|
|
* Gets the @f$ \alpha @f$ of the distribution.
|
|
*/
|
|
_RealType
|
|
alpha() const
|
|
{ return _M_alpha; }
|
|
|
|
/**
|
|
* Resets the distribution.
|
|
*/
|
|
void
|
|
reset() { }
|
|
|
|
template<class _UniformRandomNumberGenerator>
|
|
result_type
|
|
operator()(_UniformRandomNumberGenerator& __urng);
|
|
|
|
/**
|
|
* Inserts a %gamma_distribution random number distribution
|
|
* @p __x into the output stream @p __os.
|
|
*
|
|
* @param __os An output stream.
|
|
* @param __x A %gamma_distribution random number distribution.
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*
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* @returns The output stream with the state of @p __x inserted or in
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* an error state.
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*/
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|
template<typename _RealType1, typename _CharT, typename _Traits>
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|
friend std::basic_ostream<_CharT, _Traits>&
|
|
operator<<(std::basic_ostream<_CharT, _Traits>& __os,
|
|
const gamma_distribution<_RealType1>& __x);
|
|
|
|
/**
|
|
* Extracts a %gamma_distribution random number distribution
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|
* @p __x from the input stream @p __is.
|
|
*
|
|
* @param __is An input stream.
|
|
* @param __x A %gamma_distribution random number generator engine.
|
|
*
|
|
* @returns The input stream with @p __x extracted or in an error state.
|
|
*/
|
|
template<typename _RealType1, typename _CharT, typename _Traits>
|
|
friend std::basic_istream<_CharT, _Traits>&
|
|
operator>>(std::basic_istream<_CharT, _Traits>& __is,
|
|
gamma_distribution<_RealType1>& __x)
|
|
{ return __is >> __x._M_alpha; }
|
|
|
|
private:
|
|
result_type _M_alpha;
|
|
};
|
|
|
|
/* @} */ // group tr1_random_distributions_continuous
|
|
/* @} */ // group tr1_random_distributions
|
|
/* @} */ // group tr1_random
|
|
|
|
_GLIBCXX_END_NAMESPACE
|
|
}
|
|
|
|
#include <tr1/random.tcc>
|
|
|
|
#endif // _TR1_RANDOM
|