Anything like GDestroyNotify in the mm api?

[Jessy Exum]

Hello everyone,

I am using MM in a C++ project, but my question won't be related to C++
besides a very high level description of what I did.

To get MM functions to invoke bound C++ functions as callbacks, I had to
generate a small structure for each MM function call that automatically
destroys itself once the callback fires. This works perfectly (mostly)!

Except! If the MM function is cancelled, my wrapping structure is never
invoked, never freed, and I get a memory leak. My current solution is to
use g_cancellable_connect to trigger the struct's destruction when I cancel
the MM operation. That is when I saw that g_cancellable_connect accepts an
optional GDestroyNotify* callback, and I started thinking about how much
more flexible the libmm-glib API would be if functions that accepted a
GCancellable, callback, and userdata ALSO supported a GDestroyNotify style
callback for freeing userdata.

I know I can't expect a massive API change to a mature project because it
would be convenient to one guy who is working in a different language, but
I wanted to bring the idea up in case anyone else likes the idea, or knows
why it was not implemented.

Thanks to everyone who read through this, I look forward to your feedback.

Stay safe,
Jessy Diamond Exum
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