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126 lines
4.5 KiB
C++
126 lines
4.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___RANDOM_LOGNORMAL_DISTRIBUTION_H
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#define _LIBCPP___RANDOM_LOGNORMAL_DISTRIBUTION_H
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#include <__config>
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#include <__random/is_valid.h>
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#include <__random/normal_distribution.h>
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#include <cmath>
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#include <iosfwd>
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#include <limits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _RealType = double>
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class _LIBCPP_TEMPLATE_VIS lognormal_distribution {
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static_assert(__libcpp_random_is_valid_realtype<_RealType>::value,
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"RealType must be a supported floating-point type");
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public:
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// types
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typedef _RealType result_type;
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class _LIBCPP_TEMPLATE_VIS param_type {
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result_type __m_;
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result_type __s_;
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public:
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typedef lognormal_distribution distribution_type;
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_LIBCPP_HIDE_FROM_ABI explicit param_type(result_type __m = 0, result_type __s = 1) : __m_(__m), __s_(__s) {}
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_LIBCPP_HIDE_FROM_ABI result_type m() const { return __m_; }
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_LIBCPP_HIDE_FROM_ABI result_type s() const { return __s_; }
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friend _LIBCPP_HIDE_FROM_ABI bool operator==(const param_type& __x, const param_type& __y) {
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return __x.__m_ == __y.__m_ && __x.__s_ == __y.__s_;
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}
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friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const param_type& __x, const param_type& __y) { return !(__x == __y); }
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};
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private:
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normal_distribution<result_type> __nd_;
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public:
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// constructor and reset functions
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#ifndef _LIBCPP_CXX03_LANG
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_LIBCPP_HIDE_FROM_ABI lognormal_distribution() : lognormal_distribution(0) {}
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_LIBCPP_HIDE_FROM_ABI explicit lognormal_distribution(result_type __m, result_type __s = 1) : __nd_(__m, __s) {}
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#else
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_LIBCPP_HIDE_FROM_ABI explicit lognormal_distribution(result_type __m = 0, result_type __s = 1) : __nd_(__m, __s) {}
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#endif
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_LIBCPP_HIDE_FROM_ABI explicit lognormal_distribution(const param_type& __p) : __nd_(__p.m(), __p.s()) {}
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_LIBCPP_HIDE_FROM_ABI void reset() { __nd_.reset(); }
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// generating functions
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template <class _URNG>
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_LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g) {
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return std::exp(__nd_(__g));
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}
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template <class _URNG>
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_LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g, const param_type& __p) {
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typename normal_distribution<result_type>::param_type __pn(__p.m(), __p.s());
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return std::exp(__nd_(__g, __pn));
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}
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// property functions
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_LIBCPP_HIDE_FROM_ABI result_type m() const { return __nd_.mean(); }
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_LIBCPP_HIDE_FROM_ABI result_type s() const { return __nd_.stddev(); }
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_LIBCPP_HIDE_FROM_ABI param_type param() const { return param_type(__nd_.mean(), __nd_.stddev()); }
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_LIBCPP_HIDE_FROM_ABI void param(const param_type& __p) {
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typename normal_distribution<result_type>::param_type __pn(__p.m(), __p.s());
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__nd_.param(__pn);
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}
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_LIBCPP_HIDE_FROM_ABI result_type min() const { return 0; }
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_LIBCPP_HIDE_FROM_ABI result_type max() const { return numeric_limits<result_type>::infinity(); }
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friend _LIBCPP_HIDE_FROM_ABI bool operator==(const lognormal_distribution& __x, const lognormal_distribution& __y) {
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return __x.__nd_ == __y.__nd_;
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}
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friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const lognormal_distribution& __x, const lognormal_distribution& __y) {
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return !(__x == __y);
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}
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template <class _CharT, class _Traits, class _RT>
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friend basic_ostream<_CharT, _Traits>&
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operator<<(basic_ostream<_CharT, _Traits>& __os, const lognormal_distribution<_RT>& __x);
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template <class _CharT, class _Traits, class _RT>
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friend basic_istream<_CharT, _Traits>&
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operator>>(basic_istream<_CharT, _Traits>& __is, lognormal_distribution<_RT>& __x);
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};
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template <class _CharT, class _Traits, class _RT>
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inline _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
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operator<<(basic_ostream<_CharT, _Traits>& __os, const lognormal_distribution<_RT>& __x) {
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return __os << __x.__nd_;
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}
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template <class _CharT, class _Traits, class _RT>
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inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
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operator>>(basic_istream<_CharT, _Traits>& __is, lognormal_distribution<_RT>& __x) {
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return __is >> __x.__nd_;
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}
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___RANDOM_LOGNORMAL_DISTRIBUTION_H
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