Mac Apps That Use Garbage Collection Must Move to ARC

[deadalnix via Digitalmars-d]

On Thursday, 26 February 2015 at 20:15:37 UTC, Walter Bright 
wrote:
> I don't really understand your point. Write barriers are 
> emitted for code that is doing a write.

That is exactly the point? When you don't write, you don't pay 
for write barriers. It is fairly straightforward that the 
argument that write barrier are expensive and undesirable does 
not follow for immutable heap.