DIP77 - Fix unsafe RC pass by 'ref'

[Walter Bright via Digitalmars-d]

On 4/10/2015 2:11 PM, Martin Nowak wrote:
> On 04/09/2015 01:10 AM, Walter Bright wrote:
>> http://wiki.dlang.org/DIP77
>
> In the first problem example:
>
>   struct S {
>       RCArray!T array;
>   }
>   void main() {
>       auto s = S(RCArray!T([T()])); // s.array's refcount is now 1
>       foo(s, s.array[0]);           // pass by ref
>   }
>   void foo(ref S s, ref T t) {
>       s.array = RCArray!T([]);      // drop the old s.array
>       t.doSomething();              // oops, t is gone
>   }
>
> What do you do to pin s.array?
>
> auto tmp = s;
>
> or
>
> auto tmp = s.array;
>

The latter.