Objective C syntax inside .cpp file?

Question

I'm trying to copy over some example code into my own project. The example project is iPhoneExtAudioFileConvertTest from the sdk. The example project contains a file called ExtAudioFileConvert.cpp. This file contains what looks like Objective-C code:

assert([NSThread isMainThread]);

The example project runs fine, but the compiler complains about the code above when I build my own project: error: expected primary-expression before '[' token

What's going on here? Obviously there's some way to use objective c bracket syntax in a .cpp file. What do I need to do to make it work?

Answer 1

Change the file extension to .mm for Objective-C++ instead of just .cpp for C++.