[cfe-dev] objc++ enhancements for new c++ features

[James Gregurich via cfe-dev]

> On Mar 21, 2018, at 1:43 PM, David Chisnall <David.Chisnall at cl.cam.ac.uk> wrote:
> 
> I believe that you are conflating ARC-language and ARC-library features.  You should be able to use an __unsafe_unretained pointer and directly call the underlying runtime library ARC functions.  This is what I have done in smart pointers in the past to use ARC with non-ARC-aware ObjC++ compilers.
> 

not sure why you mention that. its not really relevant to my point.
 
My only point to raising the whole issue is that std::weak_pointer<NSObject> should do the right thing out of the box even if ARC is enabled. Currently..based on the last time I did experimentation...it strongly retains under ARC  and there was no way I could find to externally coerce std::weak_ptr<NSObject> to behave as a weak reference. 

The STL weak_ptr template needs to be adjusted to work correctly with objc pointers when ARC is enabled.