Joe Duffy on concurrency
Meta via Digitalmars-d
digitalmars-d at puremagic.com
Thu Dec 1 11:19:47 PST 2016
On Thursday, 1 December 2016 at 18:56:36 UTC, qznc wrote:
> On Thursday, 1 December 2016 at 12:17:46 UTC, Barry wrote:
>> http://joeduffyblog.com/2016/11/30/15-years-of-concurrency/
>
>
>
>> delegate void PureFunc<T>() immutable;
>
>> This meant that a lambda conforming to the PureFunc interface
>> could only close over immutable state.
>
>> Notice how powerful this has suddenly become! This PureFunc is
>> precisely what we would want for a parallel task. As we will
>> see shortly, these simple concepts alone are enough to enable
>> many of those PFX abstractions to become safe.
>
> That is an interesting idea. Afaik, D does not allow to limit
> closure like this?
Actually it does, and it works the exact same way as far as I can
tell.
void main()
{
int n;
int nested() immutable
{
return n; //Error: immutable function 'f761.main.nested' cannot
access mutable data 'n'
}
auto del = () immutable => n; //Error: immutable delegate
'f761.main.__dgliteral2' cannot access mutable data 'n'
}
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