[pulse] Example of use after destructor for temporaries

Summary: Adding a test case for use after destructor for temporaries. At the moment pulse does not find it as frontend does not inject destructors for temporaries.

Reviewed By: jvillard

Differential Revision: D13506229

fbshipit-source-id: 31b9466f7

infer/tests/codetoanalyze/cpp/pulse/temporaries.cpp

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2018-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+#include <iostream>
+
+namespace temporaries {
+
+struct A {
+  int f;
+};
+
+std::unique_ptr<A> some_f();
+
+void FN_call_some_f_deref_bad() {
+  const A& a_ref = *some_f(); // temporary unique_ptr returned by `some_f` is
+                              // destroyed at the end of the statement
+  std::cout << a_ref.f;
+}
+
+void call_some_f_ok() {
+  auto local = some_f(); // ok, as ownership of a temporary unique_ptr is passed
+                         // to `local`
+  const A& a_ref = *local;
+  std::cout << a_ref.f;
+}
+
+void call_some_f_copy_object_ok() {
+  auto a = *some_f().get(); // ok, as value is copied before temporary
+                            // unique_prt is destroyed
+  std::cout << a.f;
+}
+
+} // namespace temporaries