Unable to access CAMetalLayer with CocoaWindow due to protected layer property

According to the documentation for CrossWindow-Renderer, in order to access the underlying CAMetalLayer, we need to access the layer property. However, this property is marked as protected in CocoaWindow, which makes it impossible to use Metal with Cocoa. The relevant code can be found here:

CrossWindow/src/CrossWindow/Cocoa/CocoaWindow.h

Lines 48 to 61 in 3511e43

    
           protected: 
        
             // NSString* 
        
             void* mTitle; 
        
             WindowDesc mDesc; 
        
             // XWinWindow* 
        
             void* window; 
        
             // XWinView* 
        
             void* view; 
        
             // Any Layer Type 
        
             void* layer;

In contrast, the layer property is publicly accessible in UIKitWindow.

	protected:
	// NSString*
	void* mTitle;

	WindowDesc mDesc;

	// XWinWindow*
	void* window;

	// XWinView*
	void* view;

	// Any Layer Type
	void* layer;