使用ARC和C ++互操作纠正__bridge用法？ （如何避免内存泄漏？）

I have a bit of pure C++ code which is reading from Objective-C data structures with the help of a function pointer to a method in an Objective C class. I'm treating the Objective-C class instance to read from as an opaque pointer. For example, the C++ method that does the reading has a signature like this:I have a bit of pure C++ code which is reading