[libcxx-commits] [libcxx] [libc++] LWG 3821 uses_allocator_construction_args should have overload for pair-like (PR #66939)

[Louis Dionne via libcxx-commits]

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@@ -867,6 +867,43 @@ template <class T> struct hash<shared_ptr<T> >;
 template <class T, class Alloc>
   inline constexpr bool uses_allocator_v = uses_allocator<T, Alloc>::value;
 
+// [allocator.uses.construction], uses-allocator construction
+template<class T, class Alloc, class... Args>
+  constexpr auto uses_allocator_construction_args(const Alloc& alloc,             // freestanding, since C++20
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ldionne wrote:

We never really mention `// freestanding`, so I might remove it for consistency.

https://github.com/llvm/llvm-project/pull/66939