================
@@ -45,13 +47,129 @@ _LIBCPP_PUSH_MACROS
_LIBCPP_BEGIN_NAMESPACE_STD
-// __split_buffer allocates a contiguous chunk of memory and stores objects in
the range [__begin_, __end_).
-// It has uninitialized memory in the ranges [__first_, __begin_) and
[__end_, __cap_). That allows
-// it to grow both in the front and back without having to move the data.
+template <class _SplitBuffer, class _Tp, class _Allocator>
+class __split_buffer_pointer_layout {
+protected:
+ using value_type = _Tp;
+ using allocator_type = _Allocator;
+ using __alloc_rr _LIBCPP_NODEBUG =
__libcpp_remove_reference_t<allocator_type>;
+ using __alloc_traits _LIBCPP_NODEBUG = allocator_traits<__alloc_rr>;
+ using reference = value_type&;
+ using const_reference = const value_type&;
+ using size_type = typename __alloc_traits::size_type;
+ using difference_type = typename
__alloc_traits::difference_type;
+ using pointer = typename __alloc_traits::pointer;
+ using const_pointer = typename
__alloc_traits::const_pointer;
+ using iterator = pointer;
+ using const_iterator = const_pointer;
+
+public: // TODO: make private after vector becomes size-based
----------------
ldionne wrote:
Can you explain what will making `vector` size-based change with respect to
these fields being private vs public?
https://github.com/llvm/llvm-project/pull/139632
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