DMD 0.170 release

[Sean Kelly]

Bruno Medeiros wrote:
> 
> Here's an idea:
> 
>   foreach(foo, aggregate) {  // Unordered, so compiler may optmize
>   foreach(foo, &aggregate.iterForward) { // Ordered and strict
>   foreach(foo, &aggregate.iterReverse) { // Ordered and strict
> 
> This way the strictness cannot be specified. Is it necessary? That is, 
> is there a case where one wants an *ordered* iteration, but the compiler 
> can optimize into an unordered (parallel) iteration?

If the involved data is volatile and being monitored by another thread, 
then yes.  But in that case some sort of memory barriers would probably 
be involved and the compiler could detect those and not optimize, so I'm 
not sure.


Sean