Adding C++ Object to Objective-C Class

You should use opaque pointers and only include C++ headers in the file that implements your Objective-C class. That way you don’t force other files that include the header to use Objective-C++:

// header:
#import <UIKit/UIKit.h>
#import "GLView.h"

struct Opaque;

@interface GLViewController : UIViewController <GLViewDelegate>
{
    struct Opaque* opaque;
}
// ...
@end

---

// source file:
#import "myCppFile.h"

struct Opaque {
    myCppFile cppobject;
};

@implementation GLViewController
// ... create opaque member on initialization

- (void)foo
{
    opaque->cppobject.doSomething();
}
@end