[libc++] Simplify aligned_storage

Author: philnik777

libcxx/include/__type_traits/aligned_storage.h

@@ -11,7 +11,6 @@
 
 #include <__config>
 #include <__cstddef/size_t.h>
-#include <__type_traits/conditional.h>
 #include <__type_traits/integral_constant.h>
 #include <__type_traits/nat.h>
 #include <__type_traits/type_list.h>
@@ -50,22 +49,6 @@ typedef __type_list<__align_type<unsigned char>,
         > > > > > > > > > > __all_types;
 // clang-format on
 
-template <size_t _Align>
-struct _ALIGNAS(_Align) __fallback_overaligned {};
-
-template <class _TL, size_t _Align>
-struct __find_pod;
-
-template <class _Hp, size_t _Align>
-struct __find_pod<__type_list<_Hp, __nat>, _Align> {
-  typedef __conditional_t<_Align == _Hp::value, typename _Hp::type, __fallback_overaligned<_Align> > type;
-};
-
-template <class _Hp, class _Tp, size_t _Align>
-struct __find_pod<__type_list<_Hp, _Tp>, _Align> {
-  typedef __conditional_t<_Align == _Hp::value, typename _Hp::type, typename __find_pod<_Tp, _Align>::type> type;
-};
-
 template <class _TL, size_t _Len>
 struct __find_max_align;
 
@@ -88,9 +71,7 @@ struct __find_max_align<__type_list<_Hp, _Tp>, _Len>
 
 template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value>
 struct _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_TEMPLATE_VIS aligned_storage {
-  typedef typename __find_pod<__all_types, _Align>::type _Aligner;
-  union type {
-    _Aligner __align;
+  union _ALIGNAS(_Align) type {
     unsigned char __data[(_Len + _Align - 1) / _Align * _Align];
   };
 };
@@ -104,35 +85,6 @@ _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 #endif
 
-#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n)                                                                      \
-  template <size_t _Len>                                                                                               \
-  struct _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n> {                                   \
-    struct _ALIGNAS(n) type {                                                                                          \
-      unsigned char __lx[(_Len + n - 1) / n * n];                                                                      \
-    };                                                                                                                 \
-  }
-
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000);
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000);
-// PE/COFF does not support alignment beyond 8192 (=0x2000)
-#if !defined(_LIBCPP_OBJECT_FORMAT_COFF)
-_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000);
-#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF)
-
-#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION
-
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___TYPE_TRAITS_ALIGNED_STORAGE_H