forked from OSchip/llvm-project
156 lines
4.8 KiB
C++
156 lines
4.8 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_WEIBULL_DISTRIBUTION_H
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#define _LIBCPP___RANDOM_WEIBULL_DISTRIBUTION_H
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#include <__config>
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#include <__random/exponential_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 weibull_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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result_type __a_;
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result_type __b_;
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public:
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typedef weibull_distribution distribution_type;
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_LIBCPP_INLINE_VISIBILITY
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explicit param_type(result_type __a = 1, result_type __b = 1)
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: __a_(__a), __b_(__b) {}
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_LIBCPP_INLINE_VISIBILITY
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result_type a() const {return __a_;}
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_LIBCPP_INLINE_VISIBILITY
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result_type b() const {return __b_;}
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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.__a_ == __y.__a_ && __x.__b_ == __y.__b_;}
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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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};
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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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weibull_distribution() : weibull_distribution(1) {}
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_LIBCPP_INLINE_VISIBILITY
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explicit weibull_distribution(result_type __a, result_type __b = 1)
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: __p_(param_type(__a, __b)) {}
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#else
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_LIBCPP_INLINE_VISIBILITY
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explicit weibull_distribution(result_type __a = 1, result_type __b = 1)
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: __p_(param_type(__a, __b)) {}
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#endif
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_LIBCPP_INLINE_VISIBILITY
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explicit weibull_distribution(const param_type& __p)
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: __p_(__p) {}
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_LIBCPP_INLINE_VISIBILITY
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void 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 __p.b() *
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_VSTD::pow(exponential_distribution<result_type>()(__g), 1/__p.a());}
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// property functions
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_LIBCPP_INLINE_VISIBILITY
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result_type a() const {return __p_.a();}
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_LIBCPP_INLINE_VISIBILITY
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result_type b() const {return __p_.b();}
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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 weibull_distribution& __x,
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const weibull_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 weibull_distribution& __x,
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const weibull_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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basic_ostream<_CharT, _Traits>&
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operator<<(basic_ostream<_CharT, _Traits>& __os,
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const weibull_distribution<_RT>& __x)
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{
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__save_flags<_CharT, _Traits> __lx(__os);
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typedef basic_ostream<_CharT, _Traits> _OStream;
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__os.flags(_OStream::dec | _OStream::left | _OStream::fixed |
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_OStream::scientific);
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_CharT __sp = __os.widen(' ');
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__os.fill(__sp);
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__os << __x.a() << __sp << __x.b();
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return __os;
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}
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template <class _CharT, class _Traits, class _RT>
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basic_istream<_CharT, _Traits>&
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operator>>(basic_istream<_CharT, _Traits>& __is,
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weibull_distribution<_RT>& __x)
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{
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typedef weibull_distribution<_RT> _Eng;
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typedef typename _Eng::result_type result_type;
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typedef typename _Eng::param_type param_type;
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__save_flags<_CharT, _Traits> __lx(__is);
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typedef basic_istream<_CharT, _Traits> _Istream;
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__is.flags(_Istream::dec | _Istream::skipws);
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result_type __a;
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result_type __b;
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__is >> __a >> __b;
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if (!__is.fail())
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__x.param(param_type(__a, __b));
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return __is;
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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_WEIBULL_DISTRIBUTION_H
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