How should a Mojo client register a member function as a Mojo function callback?

[Simon Que]

Hi Mojo team,

Ilya and I were wondering what the proper pattern is for calling a remote Mojo function that returns some data and thus requires a callback / response handler. See Lines 19-21 here:

https://codereview.chromium.org/2056973002/diff/20001/chrome/renderer/leak_detector_remote_client.cc

Our concern is that it may not be safe to use base::Unretained(this) when binding the class member function as a callback. Looking at the Mojo documentation, I see an example here that binds a non-member function:

https://www.chromium.org/developers/design-documents/mojo#TOC-Responding-to-Requests

However, there is no example of using a class member function for this purpose. What is the proper way to do it?

Thanks,

Simon

[Jeff Brown]

Binding to class members are fine as long as you ensure that the interface pointer is released before the object is destroyed.  Callbacks won't be invoked once the interface is unbound.

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