Closed Bug 669234 Opened 12 years ago Closed 12 years ago

Use AutoRestore to manage depth recursion tracking in nsSMILTimedElement


(Core :: SVG, defect)

Not set





(Reporter: birtles, Assigned: birtles)



(1 file, 1 obsolete file)

netwerk/base/src/nsIOService.cpp has an RAII-style AutoIncrement class that would be useful elsewhere. I'd like to move it to mfbt.
Assignee: nobody → birtles
Attached patch Patch v1a, r=dholbert (obsolete) — Splinter Review
Proposed patch. dholbert has already given this r+ in bug 665334 but requesting review from cjones too.
Attachment #543842 - Flags: review?(jones.chris.g)
Comment on attachment 543842 [details] [diff] [review]
Patch v1a, r=dholbert

Hi Brian,

I'm r-'ing this patch not because there are major problems with the impl, but because I'm not sure this is a common pattern across js/src and gecko.  The pattern I've come across more commonly is [1].  If AutoIncrement starts seeing use outside of the IO service, we can polish up it and revisit.

CC'ing luke for a second opinion.

Attachment #543842 - Flags: review?(jones.chris.g) → review-
I agree with the general sentiment that its good to hoist lazily (when needed) vs. eagerly.  I also agree that I can't think of any uses for AutoIncrement in SM; usually the ++/-- is part of some specific guard that does more than just ++/--.
(In reply to comment #2)
> [1]

Much as I like the sleekness of AutoIncrement, I think that AutoRestore should serve our purposes equally well.

Brian -- so it looks like we could replace your proposed...
> AutoIncrement<PRUint16> inc(&mUpdateIntervalRecursionDepth);
> AutoRestore<PRUint16> depthRestorer(mUpdateIntervalRecursionDepth);
> mUpdateIntervalRecursionDepth++;

Perhaps we should re-target this bug to be about that?
Thanks Chris and Luke. Fair call. I failed to point out that this wasn't just speculative; the reason for requesting it is that we need something like this in SMIL. However, as Daniel points out, the AutoRestore option Chris mentioned will do the trick. Thanks!
Component: General → SVG
QA Contact: general → general
Summary: Move AutoIncrement to mozilla/mfbt → Use AutoRestore to manage depth recursion tracking in nsSMILTimedElement
Attached patch Patch v2aSplinter Review
Attachment #543842 - Attachment is obsolete: true
Attachment #544119 - Flags: review?(dholbert)
Attachment #544119 - Flags: review?(dholbert) → review+
Landed on m-c:
Closed: 12 years ago
Resolution: --- → FIXED
Whiteboard: [inbound]
Target Milestone: --- → mozilla8
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