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A project with some Objective-C has a few C classes with the implementation files having a .mm extension.
file.h
file.mm
What does the .mm mean? Shouldn’t it just be .m?
The extension
.mmis the extension for theC++compilation unit expected by the Objective-C compiler, while the.mextension is the extension for theCcompilation unit expected by the Objective-C compiler.That’s assuming you don’t use a compiler flag to override the file extension, as this gentleman has done.