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//===----------------------------------------------------------------------===//
//
// 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_LOGNORMAL_DISTRIBUTION_H
#define _LIBCPP___RANDOM_LOGNORMAL_DISTRIBUTION_H
#include <__config>
#include <__random/normal_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 lognormal_distribution
{
public:
// types
typedef _RealType result_type;
class _LIBCPP_TEMPLATE_VIS param_type
{
result_type __m_;
result_type __s_;
public:
typedef lognormal_distribution distribution_type;
_LIBCPP_INLINE_VISIBILITY
explicit param_type(result_type __m = 0, result_type __s = 1)
: __m_(__m), __s_(__s) {}
_LIBCPP_INLINE_VISIBILITY
result_type m() const {return __m_;}
_LIBCPP_INLINE_VISIBILITY
result_type s() const {return __s_;}
friend _LIBCPP_INLINE_VISIBILITY
bool operator==(const param_type& __x, const param_type& __y)
{return __x.__m_ == __y.__m_ && __x.__s_ == __y.__s_;}
friend _LIBCPP_INLINE_VISIBILITY
bool operator!=(const param_type& __x, const param_type& __y)
{return !(__x == __y);}
};
private:
normal_distribution<result_type> __nd_;
public:
// constructor and reset functions
#ifndef _LIBCPP_CXX03_LANG
_LIBCPP_INLINE_VISIBILITY
lognormal_distribution() : lognormal_distribution(0) {}
_LIBCPP_INLINE_VISIBILITY
explicit lognormal_distribution(result_type __m, result_type __s = 1)
: __nd_(__m, __s) {}
#else
_LIBCPP_INLINE_VISIBILITY
explicit lognormal_distribution(result_type __m = 0,
result_type __s = 1)
: __nd_(__m, __s) {}
#endif
_LIBCPP_INLINE_VISIBILITY
explicit lognormal_distribution(const param_type& __p)
: __nd_(__p.m(), __p.s()) {}
_LIBCPP_INLINE_VISIBILITY
void reset() {__nd_.reset();}
// generating functions
template<class _URNG>
_LIBCPP_INLINE_VISIBILITY
result_type operator()(_URNG& __g)
{
return _VSTD::exp(__nd_(__g));
}
template<class _URNG>
_LIBCPP_INLINE_VISIBILITY
result_type operator()(_URNG& __g, const param_type& __p)
{
typename normal_distribution<result_type>::param_type __pn(__p.m(), __p.s());
return _VSTD::exp(__nd_(__g, __pn));
}
// property functions
_LIBCPP_INLINE_VISIBILITY
result_type m() const {return __nd_.mean();}
_LIBCPP_INLINE_VISIBILITY
result_type s() const {return __nd_.stddev();}
_LIBCPP_INLINE_VISIBILITY
param_type param() const {return param_type(__nd_.mean(), __nd_.stddev());}
_LIBCPP_INLINE_VISIBILITY
void param(const param_type& __p)
{
typename normal_distribution<result_type>::param_type __pn(__p.m(), __p.s());
__nd_.param(__pn);
}
_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 lognormal_distribution& __x,
const lognormal_distribution& __y)
{return __x.__nd_ == __y.__nd_;}
friend _LIBCPP_INLINE_VISIBILITY
bool operator!=(const lognormal_distribution& __x,
const lognormal_distribution& __y)
{return !(__x == __y);}
template <class _CharT, class _Traits, class _RT>
friend
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const lognormal_distribution<_RT>& __x);
template <class _CharT, class _Traits, class _RT>
friend
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is,
lognormal_distribution<_RT>& __x);
};
template <class _CharT, class _Traits, class _RT>
inline _LIBCPP_INLINE_VISIBILITY
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
const lognormal_distribution<_RT>& __x)
{
return __os << __x.__nd_;
}
template <class _CharT, class _Traits, class _RT>
inline _LIBCPP_INLINE_VISIBILITY
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is,
lognormal_distribution<_RT>& __x)
{
return __is >> __x.__nd_;
}
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___RANDOM_LOGNORMAL_DISTRIBUTION_H
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