InsertBefore in DList of structs

[r-const-dev]

On Monday, 4 March 2019 at 10:09:19 UTC, drug wrote:
> On 04.03.2019 13:03, drug wrote:
>> insertStable needs DList.Range, not Until!... one. You can do 
>> something like this https://run.dlang.io/is/A2vZjW
> Oops, it was wrong example, I'd recommend this way - 
> https://run.dlang.io/is/ugPL8j
> ```
> import std.algorithm, std.container, std.stdio;
>
> struct DataPoint {
>     immutable ulong time;
>     ulong value;
> }
>
> void main() {
>     auto dataPoints = DList!DataPoint([
>         DataPoint(10_000_000, 1),
>         DataPoint(30_000_000, 3),
>         DataPoint(40_000_000, 4),
>     ]);
>
>     auto time = 30_000_000;
>     auto r = findSplit!((a, b) => a.time == b)(dataPoints[], 
> [time]);
>
>     auto dp = dataPoints[].find(r[1].front);
>     writeln("before: ", dataPoints[]);
>     dataPoints.insertBefore(dp, DataPoint(20_000_000, 2));
>     writeln("after: ", dataPoints[]);
> }
>
> ```

Thanks, seems that using dataPoints[] makes dataPoints usable as 
an range. How can I learn more about [] operator? I'm not sure I 
understand how is this documented in DList.

Find does the job! What's the difference between find and until?