MLNShapeCollection.castFromPointer constructor
      
      MLNShapeCollection.castFromPointer(})
     
    
Constructs a MLNShapeCollection that wraps the given raw object pointer.
Implementation
MLNShapeCollection.castFromPointer(ffi.Pointer<objc.ObjCObject> other,
    {bool retain = false, bool release = false}) :
    this._(other, retain: retain, release: release);