[libc++] Removes _LIBCPP_ABI_OLD_LOGNORMAL_DISTRIBUTION

[Mordante]

Summary

This was planned for LLVM 15 but was never done.

libcxx/docs/ReleaseNotes.rst

- Libc++ used to provide some C++11 tag type global variables in C++03 as an extension, which are removed in
   this release. Those variables were ``std::allocator_arg``, ``std::defer_lock``, ``std::try_to_lock``,
   ``std::adopt_lock``, and ``std::piecewise_construct``. Note that the types associated to those variables are
   still provided in C++03 as an extension (e.g. ``std::piecewise_construct_t``). Providing those variables in
   C++03 mode made it impossible to define them properly -- C++11 mandated that they be ``constexpr`` variables,
   which is impossible in C++03 mode. Furthermore, C++17 mandated that they be ``inline constexpr`` variables,
   which led to ODR violations when mixed with the C++03 definition. Cleaning this up is required for libc++ to
   make progress on support for C++20 modules.
 
+- The ``_LIBCPP_ABI_OLD_LOGNORMAL_DISTRIBUTION`` macro has been removed.
+
 Upcoming Deprecations and Removals
 ----------------------------------
 
 - The ``_LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED`` macro will not be honored anymore in LLVM 18.
   Please see the updated documentation about the safe libc++ mode and in particular the ``_LIBCPP_VERBOSE_ABORT``
   macro for details.
 
 - The headers ``<experimental/deque>``, ``<experimental/forward_list>``, ``<experimental/list>``,

libcxx/include/__random/lognormal_distribution.h

 #  pragma GCC system_header
 #endif
 
 _LIBCPP_PUSH_MACROS
 #include <__undef_macros>
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#ifdef _LIBCPP_ABI_OLD_LOGNORMAL_DISTRIBUTION
-
-template<class _RealType = double>
-class _LIBCPP_TEMPLATE_VIS lognormal_distribution
-{
-public:
-    // types
-    typedef _RealType result_type;
-
-    class _LIBCPP_TEMPLATE_VIS param_type
-    {
-        normal_distribution<result_type> __nd_;
-    public:
-        typedef lognormal_distribution distribution_type;
-
-        _LIBCPP_INLINE_VISIBILITY
-        explicit param_type(result_type __m = 0, result_type __s = 1)
-            : __nd_(__m, __s) {}
-
-        _LIBCPP_INLINE_VISIBILITY
-        result_type m() const {return __nd_.mean();}
-        _LIBCPP_INLINE_VISIBILITY
-        result_type s() const {return __nd_.stddev();}
-
-        friend _LIBCPP_INLINE_VISIBILITY
-            bool operator==(const param_type& __x, const param_type& __y)
-            {return __x.__nd_ == __y.__nd_;}
-        friend _LIBCPP_INLINE_VISIBILITY
-            bool operator!=(const param_type& __x, const param_type& __y)
-            {return !(__x == __y);}
-        friend class lognormal_distribution;
-
-        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);
-    };
-
-private:
-    param_type __p_;
-
-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)
-        : __p_(param_type(__m, __s)) {}
-#else
-    _LIBCPP_INLINE_VISIBILITY
-    explicit lognormal_distribution(result_type __m = 0,
-                                    result_type __s = 1)
-        : __p_(param_type(__m, __s)) {}
-#endif
-    _LIBCPP_INLINE_VISIBILITY
-    explicit lognormal_distribution(const param_type& __p)
-        : __p_(__p) {}
-    _LIBCPP_INLINE_VISIBILITY
-    void reset() {__p_.__nd_.reset();}
-
-    // generating functions
-    template<class _URNG>
-        _LIBCPP_INLINE_VISIBILITY
-        result_type operator()(_URNG& __g)
-        {return (*this)(__g, __p_);}
-    template<class _URNG>
-        _LIBCPP_INLINE_VISIBILITY
-        result_type operator()(_URNG& __g, const param_type& __p)
-        {return _VSTD::exp(const_cast<normal_distribution<result_type>&>(__p.__nd_)(__g));}
-
-    // property functions
-    _LIBCPP_INLINE_VISIBILITY
-    result_type m() const {return __p_.m();}
-    _LIBCPP_INLINE_VISIBILITY
-    result_type s() const {return __p_.s();}
-
-    _LIBCPP_INLINE_VISIBILITY
-    param_type param() const {return __p_;}
-    _LIBCPP_INLINE_VISIBILITY
-    void param(const param_type& __p) {__p_ = __p;}
-
-    _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.__p_ == __y.__p_;}
-    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.__p_.__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.__p_.__nd_;
-}
-
-#else // _LIBCPP_ABI_OLD_LOGNORMAL_DISTRIBUTION
-
 template<class _RealType = double>
 class _LIBCPP_TEMPLATE_VIS lognormal_distribution
 {
 public:
     // types
     typedef _RealType result_type;
 
     class _LIBCPP_TEMPLATE_VIS param_type

 inline _LIBCPP_INLINE_VISIBILITY
 basic_istream<_CharT, _Traits>&
 operator>>(basic_istream<_CharT, _Traits>& __is,
            lognormal_distribution<_RT>& __x)
 {
     return __is >> __x.__nd_;
 }
 
-#endif // _LIBCPP_ABI_OLD_LOGNORMAL_DISTRIBUTION
-
 _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
 
 #endif // _LIBCPP___RANDOM_LOGNORMAL_DISTRIBUTION_H