[libcxx-commits] [libcxx] [libcxx] implement LWG4148: unique_ptr::operator* should not allow dangling references (PR #128213)

[Mark de Wever via libcxx-commits]

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@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// 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>
+
+#include <iostream>
+#include <memory>
+
+using namespace std;
+
+struct deleter {
+  using pointer = long*;
+  void operator()(pointer) const {}
+};
+
+int main(int argc, char const *argv[]) {
+  long l = 0;
+  std::unique_ptr<const int, deleter> p(&l);
+  // Error: indirection requires pointer operand ('std::unique_ptr<const int, deleter>' invalid)
+  int i = *p;
+  cout << i << endl;
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mordante wrote:

This is fine for debugging, but in the final test this should be removed, including the `iostream` include.

https://github.com/llvm/llvm-project/pull/128213