[libcxx-commits] [libcxx] [libc++] Resolve LWG4439 and LWG4300 (PR #174257)

[William Tran-Viet via libcxx-commits]

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@@ -175,6 +175,26 @@ constexpr bool test_swap_ref() {
   }
   return true;
 }
+
+struct ADLSwap {
+  static inline bool called_adl_swap{false};
+
+  friend void swap(ADLSwap&, ADLSwap&) noexcept { called_adl_swap = true; }
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smallp-o-p wrote:

Wouldn't the use of the `= delete` `swap` just fail to compile? Would we just be testing that it's a valid expression?

https://github.com/llvm/llvm-project/pull/174257