14824e7fdSDimitry Andric //===----------------------------------------------------------------------===// 24824e7fdSDimitry Andric // 34824e7fdSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 44824e7fdSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 54824e7fdSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 64824e7fdSDimitry Andric // 74824e7fdSDimitry Andric //===----------------------------------------------------------------------===// 84824e7fdSDimitry Andric 94824e7fdSDimitry Andric #ifndef _LIBCPP___RANDOM_WEIBULL_DISTRIBUTION_H 104824e7fdSDimitry Andric #define _LIBCPP___RANDOM_WEIBULL_DISTRIBUTION_H 114824e7fdSDimitry Andric 124824e7fdSDimitry Andric #include <__config> 134824e7fdSDimitry Andric #include <__random/exponential_distribution.h> 14*5f757f3fSDimitry Andric #include <__random/is_valid.h> 154824e7fdSDimitry Andric #include <cmath> 164824e7fdSDimitry Andric #include <iosfwd> 174824e7fdSDimitry Andric #include <limits> 184824e7fdSDimitry Andric 194824e7fdSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 204824e7fdSDimitry Andric # pragma GCC system_header 214824e7fdSDimitry Andric #endif 224824e7fdSDimitry Andric 234824e7fdSDimitry Andric _LIBCPP_PUSH_MACROS 244824e7fdSDimitry Andric #include <__undef_macros> 254824e7fdSDimitry Andric 264824e7fdSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 274824e7fdSDimitry Andric 284824e7fdSDimitry Andric template<class _RealType = double> 294824e7fdSDimitry Andric class _LIBCPP_TEMPLATE_VIS weibull_distribution 304824e7fdSDimitry Andric { 31*5f757f3fSDimitry Andric static_assert(__libcpp_random_is_valid_realtype<_RealType>::value, 32*5f757f3fSDimitry Andric "RealType must be a supported floating-point type"); 33*5f757f3fSDimitry Andric 344824e7fdSDimitry Andric public: 354824e7fdSDimitry Andric // types 364824e7fdSDimitry Andric typedef _RealType result_type; 374824e7fdSDimitry Andric 384824e7fdSDimitry Andric class _LIBCPP_TEMPLATE_VIS param_type 394824e7fdSDimitry Andric { 404824e7fdSDimitry Andric result_type __a_; 414824e7fdSDimitry Andric result_type __b_; 424824e7fdSDimitry Andric public: 434824e7fdSDimitry Andric typedef weibull_distribution distribution_type; 444824e7fdSDimitry Andric 45*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 464824e7fdSDimitry Andric explicit param_type(result_type __a = 1, result_type __b = 1) 474824e7fdSDimitry Andric : __a_(__a), __b_(__b) {} 484824e7fdSDimitry Andric 49*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 504824e7fdSDimitry Andric result_type a() const {return __a_;} 51*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 524824e7fdSDimitry Andric result_type b() const {return __b_;} 534824e7fdSDimitry Andric 54*5f757f3fSDimitry Andric friend _LIBCPP_HIDE_FROM_ABI 554824e7fdSDimitry Andric bool operator==(const param_type& __x, const param_type& __y) 564824e7fdSDimitry Andric {return __x.__a_ == __y.__a_ && __x.__b_ == __y.__b_;} 57*5f757f3fSDimitry Andric friend _LIBCPP_HIDE_FROM_ABI 584824e7fdSDimitry Andric bool operator!=(const param_type& __x, const param_type& __y) 594824e7fdSDimitry Andric {return !(__x == __y);} 604824e7fdSDimitry Andric }; 614824e7fdSDimitry Andric 624824e7fdSDimitry Andric private: 634824e7fdSDimitry Andric param_type __p_; 644824e7fdSDimitry Andric 654824e7fdSDimitry Andric public: 664824e7fdSDimitry Andric // constructor and reset functions 674824e7fdSDimitry Andric #ifndef _LIBCPP_CXX03_LANG 68*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 694824e7fdSDimitry Andric weibull_distribution() : weibull_distribution(1) {} 70*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 714824e7fdSDimitry Andric explicit weibull_distribution(result_type __a, result_type __b = 1) 724824e7fdSDimitry Andric : __p_(param_type(__a, __b)) {} 734824e7fdSDimitry Andric #else 74*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 754824e7fdSDimitry Andric explicit weibull_distribution(result_type __a = 1, result_type __b = 1) 764824e7fdSDimitry Andric : __p_(param_type(__a, __b)) {} 774824e7fdSDimitry Andric #endif 78*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 794824e7fdSDimitry Andric explicit weibull_distribution(const param_type& __p) 804824e7fdSDimitry Andric : __p_(__p) {} 81*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 824824e7fdSDimitry Andric void reset() {} 834824e7fdSDimitry Andric 844824e7fdSDimitry Andric // generating functions 854824e7fdSDimitry Andric template<class _URNG> 86*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 874824e7fdSDimitry Andric result_type operator()(_URNG& __g) 884824e7fdSDimitry Andric {return (*this)(__g, __p_);} 894824e7fdSDimitry Andric template<class _URNG> 90*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 914824e7fdSDimitry Andric result_type operator()(_URNG& __g, const param_type& __p) 924824e7fdSDimitry Andric {return __p.b() * 93*5f757f3fSDimitry Andric std::pow(exponential_distribution<result_type>()(__g), 1/__p.a());} 944824e7fdSDimitry Andric 954824e7fdSDimitry Andric // property functions 96*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 974824e7fdSDimitry Andric result_type a() const {return __p_.a();} 98*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 994824e7fdSDimitry Andric result_type b() const {return __p_.b();} 1004824e7fdSDimitry Andric 101*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 1024824e7fdSDimitry Andric param_type param() const {return __p_;} 103*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 1044824e7fdSDimitry Andric void param(const param_type& __p) {__p_ = __p;} 1054824e7fdSDimitry Andric 106*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 1074824e7fdSDimitry Andric result_type min() const {return 0;} 108*5f757f3fSDimitry Andric _LIBCPP_HIDE_FROM_ABI 1094824e7fdSDimitry Andric result_type max() const {return numeric_limits<result_type>::infinity();} 1104824e7fdSDimitry Andric 111*5f757f3fSDimitry Andric friend _LIBCPP_HIDE_FROM_ABI 1124824e7fdSDimitry Andric bool operator==(const weibull_distribution& __x, 1134824e7fdSDimitry Andric const weibull_distribution& __y) 1144824e7fdSDimitry Andric {return __x.__p_ == __y.__p_;} 115*5f757f3fSDimitry Andric friend _LIBCPP_HIDE_FROM_ABI 1164824e7fdSDimitry Andric bool operator!=(const weibull_distribution& __x, 1174824e7fdSDimitry Andric const weibull_distribution& __y) 1184824e7fdSDimitry Andric {return !(__x == __y);} 1194824e7fdSDimitry Andric }; 1204824e7fdSDimitry Andric 1214824e7fdSDimitry Andric template <class _CharT, class _Traits, class _RT> 122bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& 1234824e7fdSDimitry Andric operator<<(basic_ostream<_CharT, _Traits>& __os, 1244824e7fdSDimitry Andric const weibull_distribution<_RT>& __x) 1254824e7fdSDimitry Andric { 1264824e7fdSDimitry Andric __save_flags<_CharT, _Traits> __lx(__os); 1274824e7fdSDimitry Andric typedef basic_ostream<_CharT, _Traits> _OStream; 1284824e7fdSDimitry Andric __os.flags(_OStream::dec | _OStream::left | _OStream::fixed | 1294824e7fdSDimitry Andric _OStream::scientific); 1304824e7fdSDimitry Andric _CharT __sp = __os.widen(' '); 1314824e7fdSDimitry Andric __os.fill(__sp); 1324824e7fdSDimitry Andric __os << __x.a() << __sp << __x.b(); 1334824e7fdSDimitry Andric return __os; 1344824e7fdSDimitry Andric } 1354824e7fdSDimitry Andric 1364824e7fdSDimitry Andric template <class _CharT, class _Traits, class _RT> 137bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& 1384824e7fdSDimitry Andric operator>>(basic_istream<_CharT, _Traits>& __is, 1394824e7fdSDimitry Andric weibull_distribution<_RT>& __x) 1404824e7fdSDimitry Andric { 1414824e7fdSDimitry Andric typedef weibull_distribution<_RT> _Eng; 1424824e7fdSDimitry Andric typedef typename _Eng::result_type result_type; 1434824e7fdSDimitry Andric typedef typename _Eng::param_type param_type; 1444824e7fdSDimitry Andric __save_flags<_CharT, _Traits> __lx(__is); 1454824e7fdSDimitry Andric typedef basic_istream<_CharT, _Traits> _Istream; 1464824e7fdSDimitry Andric __is.flags(_Istream::dec | _Istream::skipws); 1474824e7fdSDimitry Andric result_type __a; 1484824e7fdSDimitry Andric result_type __b; 1494824e7fdSDimitry Andric __is >> __a >> __b; 1504824e7fdSDimitry Andric if (!__is.fail()) 1514824e7fdSDimitry Andric __x.param(param_type(__a, __b)); 1524824e7fdSDimitry Andric return __is; 1534824e7fdSDimitry Andric } 1544824e7fdSDimitry Andric 1554824e7fdSDimitry Andric _LIBCPP_END_NAMESPACE_STD 1564824e7fdSDimitry Andric 1574824e7fdSDimitry Andric _LIBCPP_POP_MACROS 1584824e7fdSDimitry Andric 1594824e7fdSDimitry Andric #endif // _LIBCPP___RANDOM_WEIBULL_DISTRIBUTION_H 160