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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_GEOMETRIC_DISTRIBUTION_H
10#define _LIBCPP___CXX03___RANDOM_GEOMETRIC_DISTRIBUTION_H
11
12#include <__cxx03/__config>
13#include <__cxx03/__random/is_valid.h>
14#include <__cxx03/__random/negative_binomial_distribution.h>
15#include <__cxx03/iosfwd>
16#include <__cxx03/limits>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19# pragma GCC system_header
20#endif
21
22_LIBCPP_PUSH_MACROS
23#include <__cxx03/__undef_macros>
24
25_LIBCPP_BEGIN_NAMESPACE_STD
26
27template <class _IntType = int>
28class _LIBCPP_TEMPLATE_VIS geometric_distribution {
29 static_assert(__libcpp_random_is_valid_inttype<_IntType>::value, "IntType must be a supported integer type");
30
31public:
32 // types
33 typedef _IntType result_type;
34
35 class _LIBCPP_TEMPLATE_VIS param_type {
36 double __p_;
37
38 public:
39 typedef geometric_distribution distribution_type;
40
41 _LIBCPP_HIDE_FROM_ABI explicit param_type(double __p = 0.5) : __p_(__p) {}
42
43 _LIBCPP_HIDE_FROM_ABI double p() const { return __p_; }
44
45 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const param_type& __x, const param_type& __y) {
46 return __x.__p_ == __y.__p_;
47 }
48 friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const param_type& __x, const param_type& __y) { return !(__x == __y); }
49 };
50
51private:
52 param_type __p_;
53
54public:
55 // constructors and reset functions
56 _LIBCPP_HIDE_FROM_ABI explicit geometric_distribution(double __p = 0.5) : __p_(__p) {}
57 _LIBCPP_HIDE_FROM_ABI explicit geometric_distribution(const param_type& __p) : __p_(__p) {}
58 _LIBCPP_HIDE_FROM_ABI void reset() {}
59
60 // generating functions
61 template <class _URNG>
62 _LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g) {
63 return (*this)(__g, __p_);
64 }
65 template <class _URNG>
66 _LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g, const param_type& __p) {
67 return negative_binomial_distribution<result_type>(1, __p.p())(__g);
68 }
69
70 // property functions
71 _LIBCPP_HIDE_FROM_ABI double p() const { return __p_.p(); }
72
73 _LIBCPP_HIDE_FROM_ABI param_type param() const { return __p_; }
74 _LIBCPP_HIDE_FROM_ABI void param(const param_type& __p) { __p_ = __p; }
75
76 _LIBCPP_HIDE_FROM_ABI result_type min() const { return 0; }
77 _LIBCPP_HIDE_FROM_ABI result_type max() const { return numeric_limits<result_type>::max(); }
78
79 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const geometric_distribution& __x, const geometric_distribution& __y) {
80 return __x.__p_ == __y.__p_;
81 }
82 friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const geometric_distribution& __x, const geometric_distribution& __y) {
83 return !(__x == __y);
84 }
85};
86
87template <class _CharT, class _Traits, class _IntType>
88_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
89operator<<(basic_ostream<_CharT, _Traits>& __os, const geometric_distribution<_IntType>& __x) {
90 __save_flags<_CharT, _Traits> __lx(__os);
91 typedef basic_ostream<_CharT, _Traits> _OStream;
92 __os.flags(_OStream::dec | _OStream::left | _OStream::fixed | _OStream::scientific);
93 return __os << __x.p();
94}
95
96template <class _CharT, class _Traits, class _IntType>
97_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
98operator>>(basic_istream<_CharT, _Traits>& __is, geometric_distribution<_IntType>& __x) {
99 typedef geometric_distribution<_IntType> _Eng;
100 typedef typename _Eng::param_type param_type;
101 __save_flags<_CharT, _Traits> __lx(__is);
102 typedef basic_istream<_CharT, _Traits> _Istream;
103 __is.flags(_Istream::dec | _Istream::skipws);
104 double __p;
105 __is >> __p;
106 if (!__is.fail())
107 __x.param(param_type(__p));
108 return __is;
109}
110
111_LIBCPP_END_NAMESPACE_STD
112
113_LIBCPP_POP_MACROS
114
115#endif // _LIBCPP___CXX03___RANDOM_GEOMETRIC_DISTRIBUTION_H
116

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