Tool to fix calls to scoped_ptr<T>(NULL) to use the default ctor instead

tools/clang/rewrite_scoped_ptr_ctor_null/tests/test-expected.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/memory/scoped_ptr.h"

[Nico, 2013/06/11 19:58:13]

Hm. One day, someone will move scoped_ptr to namespace base and the test will
stop running. Is it possible to make this not depend on other files?

Then the py change wouldn't be necessary either I think.

[dcheng, 2013/06/11 20:07:41]

Originally, that's what I did--I just had a minimal definition of scoped_ptr in
this file. But the problem is AST matching is somewhat fragile, especially when
temporaries are involved. In the end, I figured it'd be more robust to just have
it depend on scoped_ptr directly.

Also, this is essentially a one-off tool; once all existing violations are
fixed, I plan to make this usage a compile error. After that, I might remove
this tool (or just leave it, so people have an example to follow).

+
+void TestDeclarations() {
+  scoped_ptr<int> a, b(new int), c;
+  scoped_ptr_malloc<int> d;
+}
+
+void TestNew() {
+  scoped_ptr<int>* a = new scoped_ptr<int>, *b = new scoped_ptr<int>(new int),
+                   *c = new scoped_ptr<int>;
+}
+
+class TestInitializers {
+ public:
+  TestInitializers() {}
+  TestInitializers(bool) {}
+  TestInitializers(double) : b(new int), c() {}
+
+ private:
+  scoped_ptr<int> a;
+  scoped_ptr<int> b;
+  scoped_ptr<int> c;
+};
+
+scoped_ptr<int> TestTemporaries(scoped_ptr<int> a, scoped_ptr<int> b) {
+  scoped_ptr<int> c =
+      TestTemporaries(scoped_ptr<int>(), scoped_ptr<int>(new int));
+  return scoped_ptr<int>();
+}