When interoperating with C++ code, should you create your ViewController as a .mm file or should you instead setup a facade between your controller and the C++ class?
What are the downsides of making a ViewController class become Objective-C++?
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You mean as a style question? You _can_ do either of those things. – Tommy Feb 02 '15 at 18:44
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No - in terms of performance and compiler issues. – Willam Hill Feb 02 '15 at 21:45
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If you plan to use the C++ code from different places (say, different view controllers), it may pay off to make a wrapper class to have everything encapsulated nicely. That way you'll only have one .mm file instead of several of them.
This answer contends that .mm files take more time to compile. Check it out for additional information on Objective-C++.
In any case, I'd try to keep ObjC and C++ as isolated as possible, if only for increased maintainability and simplicity.
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Ricardo Sanchez-Saez
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1Agreed, with an extra reason that refactoring tools are basically broken for .mm files. – Phillip Mills Feb 02 '15 at 19:05
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Good point, I almost forgot about that. Such an annoyance. I have AppCode installed just to refactor *C++* and *ObjC++* code. – Ricardo Sanchez-Saez Feb 02 '15 at 20:33