Delegate gets destroyed

Question

I'm building a cross platform app, and 1 of those platforms is Macos.

Now the core of my code is written in C++, and Obj-C++.

I create a window like this:

NSWindow* window = [[NSWindow alloc] initWithContentRect:NSMakeRect(x, y, width, height) styleMask:macosWindowStyle backing:NSBackingStoreBuffered defer:false];

but I wanted to listen to the window. I could've subclassed it, but I chose not to.

The other way to get events from the NSWindow was to set a delegate.

Now since my code was in Obj-C++, I couldn't have a C++ class inherit from a Obj-C protocol.

So, I created a Obj-C header, which implemented NSWindowDelegate .

Here it is:

@interface SomeClass : NSObject<NSWindowDelegate>

@end

I overrode windowShouldClose as such:

- (BOOL)windowShouldClose:(NSWindow *)sender {
    NSLog(@"Hello!");
    return true;
}

and in my Obj-C++ file, I did this:

NSWindow* window = [[NSWindow alloc] initWithContentRect:NSMakeRect(x, y, width, height) styleMask:macosWindowStyle backing:NSBackingStoreBuffered defer:false];
SomeClass* someClass = [[SomeClass alloc] init];
[window setDelegate:someClass];

However, when I pressed the X button, nothing happened.

I then proceeded to test the same thing in Swift, same result.

I then realized that the delegate was being destroyed because it was a weak reference.

My question is, how do I get around this?

Answer 1

OK, I figured it out. I for some reason thought I could not have Obj-C class pointers in my Obj-C++ code. I thought that was one of the limitations.