[libcxx-commits] [libcxx] [libc++] Merge the implementations of ranges::copy_n and std::copy_n and fix vector::insert to assign (PR #157444)

[Louis Dionne via libcxx-commits]

================
@@ -473,6 +473,20 @@ using iter_value_t =
                            indirectly_readable_traits<remove_cvref_t<_Ip> >,
                            iterator_traits<remove_cvref_t<_Ip> > >::value_type;
 
+template <class _Iter>
+using __iter_value_t _LIBCPP_NODEBUG = iter_value_t<_Iter>;
+
+template <class _Iter>
+using __iter_difference_t _LIBCPP_NODEBUG = iter_difference_t<_Iter>;
+
+#else
+
+template <class _Iter>
+using __iter_value_t _LIBCPP_NODEBUG = __iter_value_type<_Iter>;
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ldionne wrote:

The naming in this file is starting to be pretty confusing. I'd like us to rename `__iter_reference`, `__iter_diff_t` and friends to something else. Maybe `__classic_iter_diff_t` or `__iterator_traits_diff_t`?

https://github.com/llvm/llvm-project/pull/157444