Add truncate to List.

[AStepanov25]

No description provided.

[rvanasa]

LGTM!

Review dismissed by automation script.

[timohanke]

Is the trapping behaviour when out of bound desired?

It could be more convenient for the code using this if truncating out of bound would do nothing. I mean in the same sense as a half-open interval [0,-1) is in some languages silently accepted as an empty interval and doesn't trap.

Any opinions?

[AStepanov25]

We can generalize truncate and addRepeat to resize.

[rvanasa]

It could be more convenient for the code using this if truncating out of bound would do nothing. I mean in the same sense as a half-open interval [0,-1) is in some languages silently accepted as an empty interval and doesn't trap.

I don't have a strong opinion either way about this but am slightly leaning towards no-op instead of trapping.

[timohanke]

am slightly leaning towards no-op instead of trapping.

Same. I think it makes surrounding code easier because it saves some if statements in the surrounding code.

We can generalize truncate and addRepeat to resize.

We could, but truncate alone is still easier to use. If you wanted to truncate with resize then wouldn't you have to supply a default value for the addRepeat inside it, even though you know it's not going to be used?