[libcxx-commits] [libcxx] [libc++] P2255R2: Add deleted tuple constructor overloads (PR #205379)

[Nikolas Klauser via libcxx-commits]

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@@ -610,6 +610,28 @@ public:
                  _IsNotSame<__remove_cvref_t<_Up...[0]>, tuple>>, // extension to allow mis-behaved user constructors
              is_constructible<_Tp, _Up>... > {};
 
+#    if _LIBCPP_STD_VER >= 23
+  template <class... _Up>
+  static consteval bool __constructs_dangling_reference() {
+    if constexpr (sizeof...(_Up) == sizeof...(_Tp))
+      return _Or<std::reference_constructs_from_temporary<_Tp, _Up&&>...>::value;
+    else
+      return false;
+  }
+
+  template <class _Source, class _DecayedSource = __remove_cvref_t<_Source> >
+  static constexpr bool __has_danglings_from_tuple_like = false;
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philnik777 wrote:

Please also update these names.

https://github.com/llvm/llvm-project/pull/205379