1417279 - Make nsArray::IndexOf a bit more sane

Status: RESOLVED FIXED

(Core :: XPCOM, enhancement)

Description

[Blake Kaplan (:mrbkap) (inactive)]

nsArray::IndexOf currently has two branches [1]: one that calls through to the under lying Array's implementation of IndexOf and one that uses EnumerateForward with a closure (and that enumerates every element anyway). This appears to be because nsArray used to be based on nsVoidArray, which only had an IndexOf that took an element to find and no start index.

Fortunately, we now live in the future. nsVoidArray is long gone and nsArray's underlying implementation is based on nsTArray, which has all the variants that one could ever hope for. We can get rid of the odd second case in IndexOf.

[1] https://searchfox.org/mozilla-central/rev/a662f122c37704456457a526af90db4e3c0fd10e/xpcom/ds/nsArray.cpp#84

Comment 1

[Blake Kaplan (:mrbkap) (inactive)]

Attachment: Bug 1417279 - Remove an odd second case from nsArray::IndexOf.

Now that nsArray uses nsTArray under the hood, we don't have to do weird
ForwardEnumeration hacks to start IndexOf at a non-zero index.

Review commit: https://reviewboard.mozilla.org/r/199550/diff/#index_header
See other reviews: https://reviewboard.mozilla.org/r/199550/

Comment 2

[Nathan Froyd [:froydnj]]

Comment on attachment 8928341 [details]
Bug 1417279 - Remove an odd second case from nsArray::IndexOf.

https://reviewboard.mozilla.org/r/199550/#review204646

::: commit-message-b2f45:3
(Diff revision 1)
> +Bug 1417279 - Remove an odd second case from nsArray::IndexOf. r=froydnj
> +
> +Now that nsArray uses nsTArray under the hood, we don't have to do weird

Nit: make this `nsCOMArray`, rather than `nsTArray`, perhaps?  It's all `nsTArray` in the end, saying `nsCOMArray` would be a little clearer?

Comment 3

[Blake Kaplan (:mrbkap) (inactive)]

Comment on attachment 8928341 [details]
Bug 1417279 - Remove an odd second case from nsArray::IndexOf.

Review request updated; see interdiff: https://reviewboard.mozilla.org/r/199550/diff/1-2/

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/9ccc25047469
Remove an odd second case from nsArray::IndexOf. r=froydnj

Comment 5

[Noemi Erli[:noemi_erli]]

https://hg.mozilla.org/mozilla-central/rev/9ccc25047469