C++ classes as instance variables of an Objective-C class

Question

I need to mix Objective-C and C++. I would like to hide all the C++ stuff inside one class and keep all the others plain Objective-C. The problem is that I want to have some C++

Answer 1

I also ran into this issue recently. In my case a protocol was overkill. I just needed to keep a pointer to a data access object that happened to be a C++ object.

What I did was declare the class with a void * instance variable and cast it when I use it in the instance methods.

This is a little bit hack-y, but conceptually, it's very similar to what the Objective-C id type is.