diff options
author | mikhnenko <mikhnenko@yandex-team.com> | 2023-11-04 00:34:43 +0300 |
---|---|---|
committer | mikhnenko <mikhnenko@yandex-team.com> | 2023-11-04 00:56:50 +0300 |
commit | 1b85f8248fcbe51733270e55a66115495f55e962 (patch) | |
tree | 5a15497b81da50ab1729df98ea80b44e6d17e8f2 /contrib/libs/cxxsupp/libcxxmsvc/include/__random/negative_binomial_distribution.h | |
parent | 7f0f6f3bb94e4546f9c87b9ba3bed8721b1cd5de (diff) | |
download | ydb-1b85f8248fcbe51733270e55a66115495f55e962.tar.gz |
Use ym2 for sysincls generating
Diffstat (limited to 'contrib/libs/cxxsupp/libcxxmsvc/include/__random/negative_binomial_distribution.h')
-rw-r--r-- | contrib/libs/cxxsupp/libcxxmsvc/include/__random/negative_binomial_distribution.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/contrib/libs/cxxsupp/libcxxmsvc/include/__random/negative_binomial_distribution.h b/contrib/libs/cxxsupp/libcxxmsvc/include/__random/negative_binomial_distribution.h new file mode 100644 index 0000000000..01e9c303a7 --- /dev/null +++ b/contrib/libs/cxxsupp/libcxxmsvc/include/__random/negative_binomial_distribution.h @@ -0,0 +1,176 @@ +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef _LIBCPP___RANDOM_NEGATIVE_BINOMIAL_DISTRIBUTION_H +#define _LIBCPP___RANDOM_NEGATIVE_BINOMIAL_DISTRIBUTION_H + +#include <__config> +#include <__random/bernoulli_distribution.h> +#include <__random/gamma_distribution.h> +#include <__random/poisson_distribution.h> +#include <iosfwd> +#include <limits> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +# pragma GCC system_header +#endif + +_LIBCPP_PUSH_MACROS +#include <__undef_macros> + +_LIBCPP_BEGIN_NAMESPACE_STD + +template<class _IntType = int> +class _LIBCPP_TEMPLATE_VIS negative_binomial_distribution +{ +public: + // types + typedef _IntType result_type; + + class _LIBCPP_TEMPLATE_VIS param_type + { + result_type __k_; + double __p_; + public: + typedef negative_binomial_distribution distribution_type; + + _LIBCPP_INLINE_VISIBILITY + explicit param_type(result_type __k = 1, double __p = 0.5) + : __k_(__k), __p_(__p) {} + + _LIBCPP_INLINE_VISIBILITY + result_type k() const {return __k_;} + _LIBCPP_INLINE_VISIBILITY + double p() const {return __p_;} + + friend _LIBCPP_INLINE_VISIBILITY + bool operator==(const param_type& __x, const param_type& __y) + {return __x.__k_ == __y.__k_ && __x.__p_ == __y.__p_;} + friend _LIBCPP_INLINE_VISIBILITY + bool operator!=(const param_type& __x, const param_type& __y) + {return !(__x == __y);} + }; + +private: + param_type __p_; + +public: + // constructor and reset functions +#ifndef _LIBCPP_CXX03_LANG + _LIBCPP_INLINE_VISIBILITY + negative_binomial_distribution() : negative_binomial_distribution(1) {} + _LIBCPP_INLINE_VISIBILITY + explicit negative_binomial_distribution(result_type __k, double __p = 0.5) + : __p_(__k, __p) {} +#else + _LIBCPP_INLINE_VISIBILITY + explicit negative_binomial_distribution(result_type __k = 1, + double __p = 0.5) + : __p_(__k, __p) {} +#endif + _LIBCPP_INLINE_VISIBILITY + explicit negative_binomial_distribution(const param_type& __p) : __p_(__p) {} + _LIBCPP_INLINE_VISIBILITY + void reset() {} + + // generating functions + template<class _URNG> + _LIBCPP_INLINE_VISIBILITY + result_type operator()(_URNG& __g) + {return (*this)(__g, __p_);} + template<class _URNG> result_type operator()(_URNG& __g, const param_type& __p); + + // property functions + _LIBCPP_INLINE_VISIBILITY + result_type k() const {return __p_.k();} + _LIBCPP_INLINE_VISIBILITY + double p() const {return __p_.p();} + + _LIBCPP_INLINE_VISIBILITY + param_type param() const {return __p_;} + _LIBCPP_INLINE_VISIBILITY + void param(const param_type& __p) {__p_ = __p;} + + _LIBCPP_INLINE_VISIBILITY + result_type min() const {return 0;} + _LIBCPP_INLINE_VISIBILITY + result_type max() const {return numeric_limits<result_type>::max();} + + friend _LIBCPP_INLINE_VISIBILITY + bool operator==(const negative_binomial_distribution& __x, + const negative_binomial_distribution& __y) + {return __x.__p_ == __y.__p_;} + friend _LIBCPP_INLINE_VISIBILITY + bool operator!=(const negative_binomial_distribution& __x, + const negative_binomial_distribution& __y) + {return !(__x == __y);} +}; + +template <class _IntType> +template<class _URNG> +_IntType +negative_binomial_distribution<_IntType>::operator()(_URNG& __urng, const param_type& __pr) +{ + result_type __k = __pr.k(); + double __p = __pr.p(); + if (__k <= 21 * __p) + { + bernoulli_distribution __gen(__p); + result_type __f = 0; + result_type __s = 0; + while (__s < __k) + { + if (__gen(__urng)) + ++__s; + else + ++__f; + } + return __f; + } + return poisson_distribution<result_type>(gamma_distribution<double> + (__k, (1-__p)/__p)(__urng))(__urng); +} + +template <class _CharT, class _Traits, class _IntType> +basic_ostream<_CharT, _Traits>& +operator<<(basic_ostream<_CharT, _Traits>& __os, + const negative_binomial_distribution<_IntType>& __x) +{ + __save_flags<_CharT, _Traits> __lx(__os); + typedef basic_ostream<_CharT, _Traits> _OStream; + __os.flags(_OStream::dec | _OStream::left | _OStream::fixed | + _OStream::scientific); + _CharT __sp = __os.widen(' '); + __os.fill(__sp); + return __os << __x.k() << __sp << __x.p(); +} + +template <class _CharT, class _Traits, class _IntType> +basic_istream<_CharT, _Traits>& +operator>>(basic_istream<_CharT, _Traits>& __is, + negative_binomial_distribution<_IntType>& __x) +{ + typedef negative_binomial_distribution<_IntType> _Eng; + typedef typename _Eng::result_type result_type; + typedef typename _Eng::param_type param_type; + __save_flags<_CharT, _Traits> __lx(__is); + typedef basic_istream<_CharT, _Traits> _Istream; + __is.flags(_Istream::dec | _Istream::skipws); + result_type __k; + double __p; + __is >> __k >> __p; + if (!__is.fail()) + __x.param(param_type(__k, __p)); + return __is; +} + +_LIBCPP_END_NAMESPACE_STD + +_LIBCPP_POP_MACROS + +#endif // _LIBCPP___RANDOM_NEGATIVE_BINOMIAL_DISTRIBUTION_H |