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On Wednesday, 25 August 2021 at 11:02:23 UTC, Steven Schveighoffer wrote:
>On 8/25/21 4:31 AM, frame wrote:
>On Tuesday, 24 August 2021 at 21:15:02 UTC, Steven Schveighoffer wrote:
>I'm surprised you bring PHP as an example, as it appears their foreach interface works EXACTLY as D does:
Yeah, but the point is, there is a rewind() method. That is called every time on foreach().
It seems what you are after is forward ranges. Those are able to "rewind" when you are done with them. It's just not done through a rewind method, but via saving the range before iteration:
foreach(val; forwardRange.save)
{
...
break;
}
// forwardRange hasn't been iterated here
-Steve
This could be any custom method for my ranges or forward range returned by some function.
But that doesn't help if some thirdparty library function would break and return just an input range. Then it seems that it must be very properly implemented like postblit technics mentioned before. Some author may never care about.
That it works in 99% of all cases should not be an excuse for a design flaw.
The documentation really need to mention this.