Call operator for objc.ObjCBlock<objc.CGSize Function(ffi.Pointer<ffi.Void>, objc.CGSize)>.
objc.ObjCBlock<objc.CGSize Function(ffi.Pointer<ffi.Void>, objc.CGSize)>
Available on ObjCBlock<CGSize Function(Pointer<Void>, CGSize)>, provided by the ObjCBlock_NSSize_ffiVoid_NSSize_CallExtension extension