[libcxx-commits] [libcxx] [libc++][spaceship] P2404R3: Move-only types for equality_comparable_with, totally_ordered_with, and three_way_comparable_with (PR #99420)

[Christopher Di Bella via libcxx-commits]

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@@ -37,6 +38,22 @@ concept __weakly_equality_comparable_with =
 template <class _Tp>
 concept equality_comparable = __weakly_equality_comparable_with<_Tp, _Tp>;
 
+#  if _LIBCPP_STD_VER >= 23
+
+// clang-format off
+template <class _Tp, class _Up>
+concept equality_comparable_with =
+    equality_comparable<_Tp> && equality_comparable<_Up> &&
+    __comparison_common_type_with<_Tp, _Up> &&
+    equality_comparable<
+        common_reference_t<
+            __make_const_lvalue_ref<_Tp>,
+            __make_const_lvalue_ref<_Up>>> &&
+    __weakly_equality_comparable_with<_Tp, _Up>;
+// clang-format on
----------------
cjdb wrote:

Same here.

https://github.com/llvm/llvm-project/pull/99420