[PATCH] D17951: Implement is_always_lock_free

[Eric Fiselier via cfe-commits]

EricWF added inline comments.

================
Comment at: include/atomic:859
@@ +858,3 @@
+#if defined(__cpp_lib_atomic_is_always_lock_free)
+  static _LIBCPP_CONSTEXPR bool is_always_lock_free = __atomic_always_lock_free(sizeof(__a_), 0);
+#endif
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jfb wrote:
> I don't think so: it's similar to `std::integral_constant<_Tp, __v>::value`.
integral_constant::value has a definition on line 481 of type_traits.


http://reviews.llvm.org/D17951