[libcxx-commits] [libcxx] [libc++][chrono] Implements duration Rep constraints. (PR #80539)

[via libcxx-commits]

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@@ -29,6 +30,28 @@ class Rep
 
 struct NotARep {};
 
+#if TEST_STD_VER >= 11
+// Several duration operators take a Rep parameter. Before LWG3050 this
+// parameter was constrained to be convertible from a non-const object,
+// but the code always uses a const object. So the function was SFINEA's
+// away for this type. LWG3050 fixes the constrain to use a const
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h-vetinari wrote:

```suggestion
// but the code always uses a const object. So the function was SFINAE'd
// away for this type. LWG3050 fixes the constraint to use a const
```

https://github.com/llvm/llvm-project/pull/80539