I have a project with a base view controller class, that is inherited by about 25 other view controllers. Now I need to use a bit of core audio in that base class, so I'm integrating an Audio class (adapted from Apple's aurioTouch example project) that uses C++. The base class imports the Audio class's header, and then initializes an Audio object so that I can call methods within the Audio class.
When I compile, I get errors like "expected '=', ',', ';', 'asm' or 'attribute' before '!=' token" in the Audio class and its helper classes, because the compiler is tripping over the C++ syntax. If I change the extension of the base class to .mm I get the same errors; I think I will have to also change the extension of all the classes that inherit from the base class.
Is there a way to avoid this? In other words, how can I compile just the minimum amount of files as C++ -- ideally just the Audio class, or the Audio class and the base class -- without changing the rest of the project?
The reason I ask is that this bit of audio is about .5% of the app's functionality, and it seems wrong to change dozens of files to compile differently just because of this one small addition.
It should actually suffice to rename the .m file that uses C++ functionality to .mm. You have to make sure that you don't include any C++ headers in the header file of your class, otherwise the other non-C++ classes will go berserk trying to include your class's header file.