| //===----------------------------------------------------------------------===// |
| // |
| // 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_GEOMETRIC_DISTRIBUTION_H |
| #define _LIBCPP___RANDOM_GEOMETRIC_DISTRIBUTION_H |
| |
| #include <__config> |
| #include <__random/is_valid.h> |
| #include <__random/negative_binomial_distribution.h> |
| #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 _IntType = int> |
| class _LIBCPP_TEMPLATE_VIS geometric_distribution { |
| static_assert(__libcpp_random_is_valid_inttype<_IntType>::value, "IntType must be a supported integer type"); |
| |
| public: |
| // types |
| typedef _IntType result_type; |
| |
| class _LIBCPP_TEMPLATE_VIS param_type { |
| double __p_; |
| |
| public: |
| typedef geometric_distribution distribution_type; |
| |
| _LIBCPP_HIDE_FROM_ABI explicit param_type(double __p = 0.5) : __p_(__p) {} |
| |
| _LIBCPP_HIDE_FROM_ABI double p() const { return __p_; } |
| |
| friend _LIBCPP_HIDE_FROM_ABI bool operator==(const param_type& __x, const param_type& __y) { |
| return __x.__p_ == __y.__p_; |
| } |
| friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const param_type& __x, const param_type& __y) { return !(__x == __y); } |
| }; |
| |
| private: |
| param_type __p_; |
| |
| public: |
| // constructors and reset functions |
| #ifndef _LIBCPP_CXX03_LANG |
| _LIBCPP_HIDE_FROM_ABI geometric_distribution() : geometric_distribution(0.5) {} |
| _LIBCPP_HIDE_FROM_ABI explicit geometric_distribution(double __p) : __p_(__p) {} |
| #else |
| _LIBCPP_HIDE_FROM_ABI explicit geometric_distribution(double __p = 0.5) : __p_(__p) {} |
| #endif |
| _LIBCPP_HIDE_FROM_ABI explicit geometric_distribution(const param_type& __p) : __p_(__p) {} |
| _LIBCPP_HIDE_FROM_ABI void reset() {} |
| |
| // generating functions |
| template <class _URNG> |
| _LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g) { |
| return (*this)(__g, __p_); |
| } |
| template <class _URNG> |
| _LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g, const param_type& __p) { |
| return negative_binomial_distribution<result_type>(1, __p.p())(__g); |
| } |
| |
| // property functions |
| _LIBCPP_HIDE_FROM_ABI double p() const { return __p_.p(); } |
| |
| _LIBCPP_HIDE_FROM_ABI param_type param() const { return __p_; } |
| _LIBCPP_HIDE_FROM_ABI void param(const param_type& __p) { __p_ = __p; } |
| |
| _LIBCPP_HIDE_FROM_ABI result_type min() const { return 0; } |
| _LIBCPP_HIDE_FROM_ABI result_type max() const { return numeric_limits<result_type>::max(); } |
| |
| friend _LIBCPP_HIDE_FROM_ABI bool operator==(const geometric_distribution& __x, const geometric_distribution& __y) { |
| return __x.__p_ == __y.__p_; |
| } |
| friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const geometric_distribution& __x, const geometric_distribution& __y) { |
| return !(__x == __y); |
| } |
| }; |
| |
| template <class _CharT, class _Traits, class _IntType> |
| _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& |
| operator<<(basic_ostream<_CharT, _Traits>& __os, const geometric_distribution<_IntType>& __x) { |
| __save_flags<_CharT, _Traits> __lx(__os); |
| typedef basic_ostream<_CharT, _Traits> _OStream; |
| __os.flags(_OStream::dec | _OStream::left | _OStream::fixed | _OStream::scientific); |
| return __os << __x.p(); |
| } |
| |
| template <class _CharT, class _Traits, class _IntType> |
| _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& |
| operator>>(basic_istream<_CharT, _Traits>& __is, geometric_distribution<_IntType>& __x) { |
| typedef geometric_distribution<_IntType> _Eng; |
| typedef typename _Eng::param_type param_type; |
| __save_flags<_CharT, _Traits> __lx(__is); |
| typedef basic_istream<_CharT, _Traits> _Istream; |
| __is.flags(_Istream::dec | _Istream::skipws); |
| double __p; |
| __is >> __p; |
| if (!__is.fail()) |
| __x.param(param_type(__p)); |
| return __is; |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___RANDOM_GEOMETRIC_DISTRIBUTION_H |