[libcxx-commits] [libcxx] [libc++] Implement LWG3545: std::pointer_traits should be SFINAE-friendly. (PR #65177)

[Daniel Cheng via libcxx-commits]

================
@@ -0,0 +1,23 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <memory>
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// template <class Ptr> constexpr auto to_address(const Ptr& p) noexcept;
+//     Mandates: one of pointer_traits<Ptr>::to_address() or Ptr::operator->()
+//     is present.
+
+#include <memory>
+
+struct NotPtr {};
+
+void test() {
+  (void)std::to_address(NotPtr()); // expected-error@*:* {{no matching function for call to 'to_address'}}
----------------
zetafunction wrote:

This test was mostly making sure that `std::to_address()` on non-pointer-like types still fails. If you don't think this is useful, happy to remove this.

https://github.com/llvm/llvm-project/pull/65177