I am making a framework in C++ using metal-cpp, basically a small game engine. I am also consequently using metal-cpp-extensions provided in LearnMetalCPP to make applications work.
For one of my classes, I needed to add AppKit.hpp inside a public header file, so I moved it and its associate headers(NSApplication.hpp, NSMenu.hpp, etc.) from Project headers to Public in Build Phases' Headers, however, it started giving me the error "cast of C pointer type 'void *' to Objective-C pointer type 'Class' requires a bridged cast" at several points in the AppKit headers. They don't appear when AppKit and its associates are in the Project headers, or when they are in the Private headers and no headers import it.
I imagined that disabling Objective-C ARC and Using __bridge casts outside of ARC in Build Settings would solve it, but it didn't budge. I imagined it wouldn't involve actively changing the headers would be the answer, but even if I try to put __bridge before the problematic casts, it didn't recognize __bridge.
How do I solve this? And why is it only happening in Public and not Project headers?
Hello,
We believe this is related to mixing ARC and non-ARC (Metal-cpp) when adding AppKit.hpp to a public header file. To resolve this you’ll want to determine what modules get included with AppKit.hpp and add bridge casts.
Information on creating these bridge casts can be found here Game Porting Toolkit 2.
Sample code showing this is here Rendering a Scene with Deferred Lighting in C++.