[libcxx-commits] [libcxx] [libc++][chrono] Implement LWG 4481: disallow chrono::duration<const T, P> (PR #207558)

[via libcxx-commits]

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@@ -164,6 +169,9 @@ template <class _ToDuration, class _Rep, class _Period, enable_if_t<__is_duratio
 
 template <class _Rep, class _Period>
 class duration {
+#if _LIBCPP_STD_VER >= 26
+  static_assert(is_same_v<_Rep, remove_cv_t<_Rep>>, "A duration representation cannot be cv-qualified");
+#endif
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emmett2020 wrote:

Many thanks. I've updated the code.

- The fix now applies to C++03, C++11, and later versions.
- For the assertion message, I used "can not" instead of "cannot" to match the style of the is_duration_v check — they're similar.
- I've also updated Cxx26Issues.csv. Thanks again for your careful review.

https://github.com/llvm/llvm-project/pull/207558