forked from OSchip/llvm-project
164 lines
5.1 KiB
C++
164 lines
5.1 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/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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{
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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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{
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normal_distribution<result_type> __nd_;
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public:
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typedef lognormal_distribution distribution_type;
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_LIBCPP_INLINE_VISIBILITY
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explicit param_type(result_type __m = 0, result_type __s = 1)
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: __nd_(__m, __s) {}
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_LIBCPP_INLINE_VISIBILITY
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result_type m() const {return __nd_.mean();}
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_LIBCPP_INLINE_VISIBILITY
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result_type s() const {return __nd_.stddev();}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator==(const param_type& __x, const param_type& __y)
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{return __x.__nd_ == __y.__nd_;}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator!=(const param_type& __x, const param_type& __y)
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{return !(__x == __y);}
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friend class lognormal_distribution;
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template <class _CharT, class _Traits, class _RT>
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friend
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basic_ostream<_CharT, _Traits>&
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operator<<(basic_ostream<_CharT, _Traits>& __os,
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const lognormal_distribution<_RT>& __x);
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template <class _CharT, class _Traits, class _RT>
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friend
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basic_istream<_CharT, _Traits>&
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operator>>(basic_istream<_CharT, _Traits>& __is,
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lognormal_distribution<_RT>& __x);
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};
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private:
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param_type __p_;
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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_INLINE_VISIBILITY
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lognormal_distribution() : lognormal_distribution(0) {}
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_LIBCPP_INLINE_VISIBILITY
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explicit lognormal_distribution(result_type __m, result_type __s = 1)
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: __p_(param_type(__m, __s)) {}
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#else
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_LIBCPP_INLINE_VISIBILITY
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explicit lognormal_distribution(result_type __m = 0,
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result_type __s = 1)
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: __p_(param_type(__m, __s)) {}
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#endif
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_LIBCPP_INLINE_VISIBILITY
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explicit lognormal_distribution(const param_type& __p)
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: __p_(__p) {}
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_LIBCPP_INLINE_VISIBILITY
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void reset() {__p_.__nd_.reset();}
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// generating functions
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template<class _URNG>
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_LIBCPP_INLINE_VISIBILITY
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result_type operator()(_URNG& __g)
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{return (*this)(__g, __p_);}
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template<class _URNG>
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_LIBCPP_INLINE_VISIBILITY
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result_type operator()(_URNG& __g, const param_type& __p)
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{return _VSTD::exp(const_cast<normal_distribution<result_type>&>(__p.__nd_)(__g));}
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// property functions
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_LIBCPP_INLINE_VISIBILITY
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result_type m() const {return __p_.m();}
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_LIBCPP_INLINE_VISIBILITY
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result_type s() const {return __p_.s();}
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_LIBCPP_INLINE_VISIBILITY
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param_type param() const {return __p_;}
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_LIBCPP_INLINE_VISIBILITY
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void param(const param_type& __p) {__p_ = __p;}
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_LIBCPP_INLINE_VISIBILITY
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result_type min() const {return 0;}
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_LIBCPP_INLINE_VISIBILITY
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result_type max() const {return numeric_limits<result_type>::infinity();}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator==(const lognormal_distribution& __x,
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const lognormal_distribution& __y)
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{return __x.__p_ == __y.__p_;}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator!=(const lognormal_distribution& __x,
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const lognormal_distribution& __y)
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{return !(__x == __y);}
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template <class _CharT, class _Traits, class _RT>
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friend
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basic_ostream<_CharT, _Traits>&
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operator<<(basic_ostream<_CharT, _Traits>& __os,
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const lognormal_distribution<_RT>& __x);
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template <class _CharT, class _Traits, class _RT>
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friend
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basic_istream<_CharT, _Traits>&
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operator>>(basic_istream<_CharT, _Traits>& __is,
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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_INLINE_VISIBILITY
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basic_ostream<_CharT, _Traits>&
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operator<<(basic_ostream<_CharT, _Traits>& __os,
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const lognormal_distribution<_RT>& __x)
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{
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return __os << __x.__p_.__nd_;
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}
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template <class _CharT, class _Traits, class _RT>
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inline _LIBCPP_INLINE_VISIBILITY
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basic_istream<_CharT, _Traits>&
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operator>>(basic_istream<_CharT, _Traits>& __is,
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lognormal_distribution<_RT>& __x)
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{
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return __is >> __x.__p_.__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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