Trouble using opaque pointers in Objective C++

Question

The answer to this quesion explains that opaque pointers are a good way to include C++ member variables in an Objective C++ header. I\'m getting compile errors when trying to fo

Answer 1

I don't have any problem with the following minimal sample:

struct ADSR_opaque;
@interface LoopyPulser : NSObject {
    struct ADSR_opaque* env;
}
@end

If you include the header in plain Objective-C files (not Objective-C++), you have to add struct.

Alternatively use typedefs:

struct ADSR_opaque_;
typedef struct ADSR_opaque_ ADSR_opaque;
@interface LoopyPulser : NSObject {
    ADSR_opaque* env;
    // ...