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Yes, and this .h file will be used from .c/.cpp because looks like it's way to bulky to add additional .m/.mm file just for OSX/iOS case when creating cross platform applications. Check tigr - it's possible to run exactly the same C/C++ code on Windows and OSX without any changes at all.

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Since Objective-C is a true superset of C (unlike C++) and there's also Objective-C++, you can just tell the compiler to compile all .c/.cpp as if they were .m/.mm. That is, if you can figure out how to coax your build system to pass the right flags.

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