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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/contrib/llvm-project/libcxx/include/__random/lognormal_distribution.h
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//===----------------------------------------------------------------------===//

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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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