"Almost there" version of TDPL updated on Safari Rough Cuts

[Sean Kelly]

dsimcha Wrote:

> == Quote from Sean Kelly (sean at invisibleduck.org)'s article
> > Álvaro Castro-Castilla Wrote:
> > >
> > > Language extensions for message passing, such as Kilim for Java send messages
> giving away the ownership of data, not copying it. That's a reason for the need of
> compiler/runtime support.
> > Knowledge of unique ownership can obviate the need for copying, but copying is a
> reasonable fall-back in most cases.
> > > Also, parallel map/foreach is more feasible as a library-only solution,
> whether the message passing requires some support from the runtime environment.
> > It really depends on the language and what your goals are.  There are message
> passing libraries for C, for example, but they don't provide much in the way of
> safety.
> 
> IDK, generally I agree with the idea that D and Phobos should provide safe
> defaults and more efficiency when you really need it and explicitly ask for it.
> The exception, though, is when someone is using a construct that would only be
> used by people who really need efficiency, and thus has already explicitly asked
> for efficiency.  This includes parallel foreach.

Yeah, that's why I said in my original reply that if message passing were used, it may be necessary to use casting to avoid copying.  However, it may just be enough to just pass a slice of a shared range.  Nothing has really been decided regarding restrictions for what can be passed.