[libcxx-commits] [libcxx] [libc++] Replace `__compressed_pair` with `[[no_unique_address]]` (PR #76756)

[Louis Dionne via libcxx-commits]

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@@ -725,8 +726,7 @@ public:
 private:
   pointer __begin_ = nullptr;
   pointer __end_   = nullptr;
-  __compressed_pair<pointer, allocator_type> __end_cap_ =
-      __compressed_pair<pointer, allocator_type>(nullptr, __default_init_tag());
+  _LIBCPP_COMPRESSED_PAIR(pointer, __cap_, allocator_type, __alloc_);
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ldionne wrote:

You should be able to restore the `= nullptr` here and re-simplify the ctors after my suggestion to the macro.

https://github.com/llvm/llvm-project/pull/76756