Add helper KeepRefUntilDone

webrtc/base/keep_ref_until_done.h

Index: webrtc/base/keep_ref_until_done.h
diff --git a/webrtc/base/keep_ref_until_done.h b/webrtc/base/keep_ref_until_done.h
new file mode 100644
index 0000000000000000000000000000000000000000..743a09a8065a882bcfc68d8fb17d833650276a1d
--- /dev/null
+++ b/webrtc/base/keep_ref_until_done.h
@@ -0,0 +1,35 @@
+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_KEEP_REF_UNTIL_DONE_H_
+#define WEBRTC_BASE_KEEP_REF_UNTIL_DONE_H_
+
+#include "webrtc/base/bind.h"
+#include "webrtc/base/callback.h"
+#include "webrtc/base/refcount.h"
+#include "webrtc/base/scoped_ref_ptr.h"
+
+namespace rtc {
+
+namespace impl {
+static inline void DoNothing(const scoped_refptr<RefCountInterface>& object) {}
+}  // namespace impl
+
+// KeepRefUntilDone keeps a reference to |object| until the returned
+// callback goes out of scope. If the returned callback is copied, the
+// reference will be released when the last callback goes out of scope.
+static inline Callback0<void> KeepRefUntilDone(RefCountInterface* object) {

[tommi, 2015/11/30 13:05:01]

I actually kinda liked having the same compatibility as scoped_refptr does.

[magjed_webrtc, 2015/11/30 15:41:52]

If you don't put this definition in a cc file, you might as well use a template
function. As long as it's static you shouldn't get any linker name conflicts.

+  return rtc::Bind(&impl::DoNothing, scoped_refptr<RefCountInterface>(object));
+}
+
+}  // namespace rtc
+
+
+#endif  // WEBRTC_BASE_KEEP_REF_UNTIL_DONE_H_