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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_EXTREME_VALUE_DISTRIBUTION_H
10#define _LIBCPP___CXX03___RANDOM_EXTREME_VALUE_DISTRIBUTION_H
11
12#include <__cxx03/__config>
13#include <__cxx03/__random/is_valid.h>
14#include <__cxx03/__random/uniform_real_distribution.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 extreme_value_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 extreme_value_distribution distribution_type;
43
44 _LIBCPP_HIDE_FROM_ABI explicit param_type(result_type __a = 0, 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 extreme_value_distribution(result_type __a = 0, result_type __b = 1)
61 : __p_(param_type(__a, __b)) {}
62 _LIBCPP_HIDE_FROM_ABI explicit extreme_value_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
73 // property functions
74 _LIBCPP_HIDE_FROM_ABI result_type a() const { return __p_.a(); }
75 _LIBCPP_HIDE_FROM_ABI result_type b() const { return __p_.b(); }
76
77 _LIBCPP_HIDE_FROM_ABI param_type param() const { return __p_; }
78 _LIBCPP_HIDE_FROM_ABI void param(const param_type& __p) { __p_ = __p; }
79
80 _LIBCPP_HIDE_FROM_ABI result_type min() const { return -numeric_limits<result_type>::infinity(); }
81 _LIBCPP_HIDE_FROM_ABI result_type max() const { return numeric_limits<result_type>::infinity(); }
82
83 friend _LIBCPP_HIDE_FROM_ABI bool
84 operator==(const extreme_value_distribution& __x, const extreme_value_distribution& __y) {
85 return __x.__p_ == __y.__p_;
86 }
87 friend _LIBCPP_HIDE_FROM_ABI bool
88 operator!=(const extreme_value_distribution& __x, const extreme_value_distribution& __y) {
89 return !(__x == __y);
90 }
91};
92
93template <class _RealType>
94template <class _URNG>
95_RealType extreme_value_distribution<_RealType>::operator()(_URNG& __g, const param_type& __p) {
96 static_assert(__libcpp_random_is_valid_urng<_URNG>::value, "");
97 return __p.a() - __p.b() * std::log(-std::log(1 - uniform_real_distribution<result_type>()(__g)));
98}
99
100template <class _CharT, class _Traits, class _RT>
101_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
102operator<<(basic_ostream<_CharT, _Traits>& __os, const extreme_value_distribution<_RT>& __x) {
103 __save_flags<_CharT, _Traits> __lx(__os);
104 typedef basic_ostream<_CharT, _Traits> _OStream;
105 __os.flags(_OStream::dec | _OStream::left | _OStream::fixed | _OStream::scientific);
106 _CharT __sp = __os.widen(' ');
107 __os.fill(__sp);
108 __os << __x.a() << __sp << __x.b();
109 return __os;
110}
111
112template <class _CharT, class _Traits, class _RT>
113_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
114operator>>(basic_istream<_CharT, _Traits>& __is, extreme_value_distribution<_RT>& __x) {
115 typedef extreme_value_distribution<_RT> _Eng;
116 typedef typename _Eng::result_type result_type;
117 typedef typename _Eng::param_type param_type;
118 __save_flags<_CharT, _Traits> __lx(__is);
119 typedef basic_istream<_CharT, _Traits> _Istream;
120 __is.flags(_Istream::dec | _Istream::skipws);
121 result_type __a;
122 result_type __b;
123 __is >> __a >> __b;
124 if (!__is.fail())
125 __x.param(param_type(__a, __b));
126 return __is;
127}
128
129_LIBCPP_END_NAMESPACE_STD
130
131_LIBCPP_POP_MACROS
132
133#endif // _LIBCPP___CXX03___RANDOM_EXTREME_VALUE_DISTRIBUTION_H
134

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