On 04.03.2019 11:14, r-const-dev wrote:
I have a DList of structs, DataPoint, ordered by a struct field, time.
I'm trying to insert a new entry preserving order, so I'm trying to use
`until` to find the insertion point and `insertBefore` with the result.
struct DataPoint {
immutable ulong time;
ulong value;
}
void main() {
DList!DataPoint dataPoints;
void incrementAt(ulong time) {
auto dataPoint = until!(dp => dp.time >= time)(dataPoints);
if (dataPoint.time == time) {
++dataPoint.value;
} else {
dataPoints.insertBefore(dataPoint, DataPoint(time, 1));
}
}
}
But I'm getting:
/dlang/dmd/linux/bin64/../../src/phobos/std/algorithm/searching.d(4898):
Error: template instance `onlineapp.main.incrementAt.Until!(__lambda2,
DList!(DataPoint), void)` does not match template declaration
Until(alias pred, Range, Sentinel) if (isInputRange!Range)
onlineapp.d(14): Error: template instance
`onlineapp.main.incrementAt.until!((dp) => dp.time >= time,
DList!(DataPoint))` error instantiating
dataPoints itself isn't a range, you need to use dataPoints[]. Also
insertStable needs DList.Range, not Until!... one. You can do something
like this https://run.dlang.io/is/A2vZjW
