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1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___CXX03___RANDOM_WEIBULL_DISTRIBUTION_H
10#define _LIBCPP___CXX03___RANDOM_WEIBULL_DISTRIBUTION_H
11
12#include <__cxx03/__config>
13#include <__cxx03/__random/exponential_distribution.h>
14#include <__cxx03/__random/is_valid.h>
15#include <__cxx03/cmath>
16#include <__cxx03/iosfwd>
17#include <__cxx03/limits>
18
19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20# pragma GCC system_header
21#endif
22
23_LIBCPP_PUSH_MACROS
24#include <__cxx03/__undef_macros>
25
26_LIBCPP_BEGIN_NAMESPACE_STD
27
28template <class _RealType = double>
29class _LIBCPP_TEMPLATE_VIS weibull_distribution {
30 static_assert(__libcpp_random_is_valid_realtype<_RealType>::value,
31 "RealType must be a supported floating-point type");
32
33public:
34 // types
35 typedef _RealType result_type;
36
37 class _LIBCPP_TEMPLATE_VIS param_type {
38 result_type __a_;
39 result_type __b_;
40
41 public:
42 typedef weibull_distribution distribution_type;
43
44 _LIBCPP_HIDE_FROM_ABI explicit param_type(result_type __a = 1, result_type __b = 1) : __a_(__a), __b_(__b) {}
45
46 _LIBCPP_HIDE_FROM_ABI result_type a() const { return __a_; }
47 _LIBCPP_HIDE_FROM_ABI result_type b() const { return __b_; }
48
49 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const param_type& __x, const param_type& __y) {
50 return __x.__a_ == __y.__a_ && __x.__b_ == __y.__b_;
51 }
52 friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const param_type& __x, const param_type& __y) { return !(__x == __y); }
53 };
54
55private:
56 param_type __p_;
57
58public:
59 // constructor and reset functions
60 _LIBCPP_HIDE_FROM_ABI explicit weibull_distribution(result_type __a = 1, result_type __b = 1)
61 : __p_(param_type(__a, __b)) {}
62 _LIBCPP_HIDE_FROM_ABI explicit weibull_distribution(const param_type& __p) : __p_(__p) {}
63 _LIBCPP_HIDE_FROM_ABI void reset() {}
64
65 // generating functions
66 template <class _URNG>
67 _LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g) {
68 return (*this)(__g, __p_);
69 }
70 template <class _URNG>
71 _LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g, const param_type& __p) {
72 return __p.b() * std::pow(exponential_distribution<result_type>()(__g), 1 / __p.a());
73 }
74
75 // property functions
76 _LIBCPP_HIDE_FROM_ABI result_type a() const { return __p_.a(); }
77 _LIBCPP_HIDE_FROM_ABI result_type b() const { return __p_.b(); }
78
79 _LIBCPP_HIDE_FROM_ABI param_type param() const { return __p_; }
80 _LIBCPP_HIDE_FROM_ABI void param(const param_type& __p) { __p_ = __p; }
81
82 _LIBCPP_HIDE_FROM_ABI result_type min() const { return 0; }
83 _LIBCPP_HIDE_FROM_ABI result_type max() const { return numeric_limits<result_type>::infinity(); }
84
85 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const weibull_distribution& __x, const weibull_distribution& __y) {
86 return __x.__p_ == __y.__p_;
87 }
88 friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const weibull_distribution& __x, const weibull_distribution& __y) {
89 return !(__x == __y);
90 }
91};
92
93template <class _CharT, class _Traits, class _RT>
94_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
95operator<<(basic_ostream<_CharT, _Traits>& __os, const weibull_distribution<_RT>& __x) {
96 __save_flags<_CharT, _Traits> __lx(__os);
97 typedef basic_ostream<_CharT, _Traits> _OStream;
98 __os.flags(_OStream::dec | _OStream::left | _OStream::fixed | _OStream::scientific);
99 _CharT __sp = __os.widen(' ');
100 __os.fill(__sp);
101 __os << __x.a() << __sp << __x.b();
102 return __os;
103}
104
105template <class _CharT, class _Traits, class _RT>
106_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
107operator>>(basic_istream<_CharT, _Traits>& __is, weibull_distribution<_RT>& __x) {
108 typedef weibull_distribution<_RT> _Eng;
109 typedef typename _Eng::result_type result_type;
110 typedef typename _Eng::param_type param_type;
111 __save_flags<_CharT, _Traits> __lx(__is);
112 typedef basic_istream<_CharT, _Traits> _Istream;
113 __is.flags(_Istream::dec | _Istream::skipws);
114 result_type __a;
115 result_type __b;
116 __is >> __a >> __b;
117 if (!__is.fail())
118 __x.param(param_type(__a, __b));
119 return __is;
120}
121
122_LIBCPP_END_NAMESPACE_STD
123
124_LIBCPP_POP_MACROS
125
126#endif // _LIBCPP___CXX03___RANDOM_WEIBULL_DISTRIBUTION_H
127

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source code of libcxx/include/__cxx03/__random/weibull_distribution.h