| //===----------------------------------------------------------------------===// |
| // |
| // 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_WEIBULL_DISTRIBUTION_H |
| #define _LIBCPP___RANDOM_WEIBULL_DISTRIBUTION_H |
| |
| #include <__config> |
| #include <__random/exponential_distribution.h> |
| #include <cmath> |
| #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 _RealType = double> |
| class _LIBCPP_TEMPLATE_VIS weibull_distribution |
| { |
| public: |
| // types |
| typedef _RealType result_type; |
| |
| class _LIBCPP_TEMPLATE_VIS param_type |
| { |
| result_type __a_; |
| result_type __b_; |
| public: |
| typedef weibull_distribution distribution_type; |
| |
| _LIBCPP_INLINE_VISIBILITY |
| explicit param_type(result_type __a = 1, result_type __b = 1) |
| : __a_(__a), __b_(__b) {} |
| |
| _LIBCPP_INLINE_VISIBILITY |
| result_type a() const {return __a_;} |
| _LIBCPP_INLINE_VISIBILITY |
| result_type b() const {return __b_;} |
| |
| friend _LIBCPP_INLINE_VISIBILITY |
| bool operator==(const param_type& __x, const param_type& __y) |
| {return __x.__a_ == __y.__a_ && __x.__b_ == __y.__b_;} |
| 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 |
| weibull_distribution() : weibull_distribution(1) {} |
| _LIBCPP_INLINE_VISIBILITY |
| explicit weibull_distribution(result_type __a, result_type __b = 1) |
| : __p_(param_type(__a, __b)) {} |
| #else |
| _LIBCPP_INLINE_VISIBILITY |
| explicit weibull_distribution(result_type __a = 1, result_type __b = 1) |
| : __p_(param_type(__a, __b)) {} |
| #endif |
| _LIBCPP_INLINE_VISIBILITY |
| explicit weibull_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> |
| _LIBCPP_INLINE_VISIBILITY |
| result_type operator()(_URNG& __g, const param_type& __p) |
| {return __p.b() * |
| _VSTD::pow(exponential_distribution<result_type>()(__g), 1/__p.a());} |
| |
| // property functions |
| _LIBCPP_INLINE_VISIBILITY |
| result_type a() const {return __p_.a();} |
| _LIBCPP_INLINE_VISIBILITY |
| result_type b() const {return __p_.b();} |
| |
| _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>::infinity();} |
| |
| friend _LIBCPP_INLINE_VISIBILITY |
| bool operator==(const weibull_distribution& __x, |
| const weibull_distribution& __y) |
| {return __x.__p_ == __y.__p_;} |
| friend _LIBCPP_INLINE_VISIBILITY |
| bool operator!=(const weibull_distribution& __x, |
| const weibull_distribution& __y) |
| {return !(__x == __y);} |
| }; |
| |
| template <class _CharT, class _Traits, class _RT> |
| basic_ostream<_CharT, _Traits>& |
| operator<<(basic_ostream<_CharT, _Traits>& __os, |
| const weibull_distribution<_RT>& __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); |
| __os << __x.a() << __sp << __x.b(); |
| return __os; |
| } |
| |
| template <class _CharT, class _Traits, class _RT> |
| basic_istream<_CharT, _Traits>& |
| operator>>(basic_istream<_CharT, _Traits>& __is, |
| weibull_distribution<_RT>& __x) |
| { |
| typedef weibull_distribution<_RT> _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 __a; |
| result_type __b; |
| __is >> __a >> __b; |
| if (!__is.fail()) |
| __x.param(param_type(__a, __b)); |
| return __is; |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___RANDOM_WEIBULL_DISTRIBUTION_H |