foreach

[Bill Baxter]

On Sun, Nov 23, 2008 at 3:25 PM, Jarrett Billingsley
<jarrett.billingsley at gmail.com> wrote:
> On Sat, Nov 22, 2008 at 11:40 PM, Sam S E <eisenstat.aa at sympatioco.ca> wrote:
>> Does foreach use delegates? Isn't that unnecessary overhead?
>> --Sam
>
> It does use delegates, for iterating over most types.  When iterating
> over arrays, the compiler turns it into a sort of for loop instead.
>
> Is it unnecessary overhead?  It's not always as fast as it could be,
> but unless someone can figure out some other way of implementing it,
> it's pretty much the best we can get.
>
> How about iterator objects, like in C++ or Java?  Are they unnecessary
> overhead?  ;)

How does delegate overhead compare to the stack thread context switch
overhead in the new Fibers in druntime?

--bb