DIP69 - Implement scope for escape proof references
H. S. Teoh via Digitalmars-d
digitalmars-d at puremagic.com
Thu Dec 4 10:31:07 PST 2014
On Thu, Dec 04, 2014 at 01:57:43AM -0800, Walter Bright via Digitalmars-d wrote:
> On 12/4/2014 1:53 AM, ketmar via Digitalmars-d wrote:
> >cosmetic issue: some comments are referring to rules by number
> >("Error, rule 5"), yet the rules aren't explicitly numbered. not a
> >big deal, but still somewhat hard to follow.
>
> Yeah, still learning wiki markup!
I don't understand the line where rule 5 was invoked:
scope int* a;
...
scope int** f = &a; // Error, rule 5
Why is it an error, since f has a shorter lifetime than a? And what has
it gotta do with rule 5, which currently reads:
A scope ref variable can be initialized with another scope ref
variable - scope ref is idempotent.
?
T
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