Can I mix Swift with C++? Like the Objective-C .mm files

by

The confusion may come from the assumption that merely changing a file extension from .m to .mm is all you need to bridge the languages, when, in reality, it does nothing of that sort. It is not the .mm that causes friction with .cpp, it is the .h header which must positively not be a C++ header.

Same project: Yes.

In the same project, you can happily mix C, C++, Objective-C, Objective C++, Swift, and even Assembly.

  1. ...Bridging-Header.h: you expose C, Objective-C and Objective-C++ to Swift using this bridge
  2. <ProductModuleName>-Swift.h: exposes automatically your Swift classes marked with @objc to Objective-C
  3. .h: this is the tricky part, since they are ambiguously used for all flavors of C, ++ or not, Objective or not. When a .h does not contain a single C++ keyword, like class, it can be added to the ...Bridging-Header.h, and will expose whatever function the corresponding .c or .cpp functionalities it declares. Otherwise, that header must be wrapped in either a pure C or Objective-C API.

Same file: No.

In the same file, you can’t mix all 5. In the same source file:

  1. .swift: you can’t mix Swift with anything
  2. .m: you can mix Objective-C with C. (@Vinzzz)
  3. .mm: you can mix Objective-C with C++. This bridge is Objective-C++. (@Vinzzz).
  4. .c: pure C
  5. .cpp: you can mix C++ & Assembly (@Vality)
  6. .h: ubiquitous and ambiguous C, C++, Objective-C or Objective-C++, so the answer is it depends.

References

More Related Contents:

  1. OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
  2. How exactly does __attribute__((constructor)) work?
  3. Calling Objective-C method from C++ member function?
  4. Is it possible to program iPhone in C++
  5. Interacting with C++ classes from Swift
  6. What is Objective C++? [closed]
  7. OpenCV C++/Obj-C: Advanced square detection
  8. Use C++ with Cocoa Instead of Objective-C?
  9. Can I separate C++ main function and classes from Objective-C and/or C routines at compile and link?
  10. Can I have Swift, Objective-C, C and C++ files in the same Xcode project?
  11. Compiling external C++ library for use with iOS project
  12. Mixing Objective-C and C++
  13. How do unsigned integers work
  14. Image edge smoothing with opencv
  15. Video processing with OpenCV in IOS Swift project
  16. How can I use C++ with Objective-C in XCode
  17. banker’s algorithm in c++
  18. Finding the last digit of a very large 2^n number [closed]
  19. What are transparent comparators?
  20. What are all the member-functions created by compiler for a class? Does that happen all the time?
  21. dynamical two dimension array according to input
  22. Why should I declare a virtual destructor for an abstract class in C++?
  23. Why does call-by-value example not modify input parameter?
  24. Converting Hex String to NSData in Swift
  25. What is the purpose of using -pedantic in the GCC/G++ compiler?
  26. Multithreaded Rendering on OpenGL
  27. How to make a multiple-read/single-write lock from more basic synchronization primitives?
  28. How to rearrange a string equation?
  29. How to print pthread_t
  30. Convert string to mathematical evaluation [closed]

Leave a Comment