Using a C++ source file across Mac and Windows

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Given a header only C++ source file that implements logging mostly using standard C++11 so that it is portable and works on both Mac and Windows. Just has a class that implements static functions for "standard" logging requirements in a typical project.

It has a few functions within #ifdef/#endif block that use NSString and few other Cocoa classes for UI based projects that use Cocoa. Everything else in the header is "pure" C++.

Any C++ source file that uses logging includes this header and to be able to compile in XCode the file settings specify "compile as Objective C++" although the file extension is .cpp.

It seems "awkward" to have a .cpp file have Objective C code (by including this header) and compile as .mm (Objective C++), but to keep it portable the .cpp extension is "necessary/ appropriate".

Assuming that using Boost or another library is not an option, how can this situation be rectified - not having to compile a .cpp file as Objective C++, but yet being able to use the header for logging say NSString values from a .mm file.

Posted 3-Dec-15 4:02am

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Albert Holguin 3-Dec-15 22:39pm

Not sure why libraries aren't an option for you... ??? ....there's an open source logger called log4cpp that's become pretty popular in Linux, but it's definitely cross-platform.

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KarstenK · Answer 1 · 2015-12-03T04:39:00

You can use C and C++ files in Xcode, but you must must create it correct for the Xcode-compiler. With "File->New->File" and select the correct type in the wizard.

It is easier to separate the Cocoa classes from pure C/C++. We often use a Coca-Wrapper class which converting the data to pure C data and than calling some C++.

Objective-C

- (void) write: (NSString*) text
{
  char *text = [text cStringUsingEncoding:NSUTF8StringEncoding]; 
  LogMessage(text);
}