On Wednesday, July 25, 2012 12:45:52 PM UTC+3, Aryeh Gregor wrote:
> The C++11 standard defines a new dedicated null-pointer symbol, "nullptr".  
> It provides better type-safety than existing null-pointer definitions, 
> because it doesn't allow implicit conversion to numeric types.  In 
> <https://bugzilla.mozilla.org/show_bug.cgi?id=626472> I defined "nullptr" to 
> mean 0L/0LL (like current nsnull) where unsupported, then redefined "nsnull" 
> to mean "nullptr".  This caught a bunch of places where people were using 
> nsnull to mean crazy things like NS_OK or other things that happened to equal 
> 0.
> 
> 
> 
> The next step is to s/nsnull/nullptr/ in the codebase, and get rid of nsnull. 
>  There's no reason for us to use our own identifier when there's a standard 
> one.  This will be of comparable scale to the PRBool elimination of last year 
> -- around 20,000 lines changed instead of 30,000.  This will of course 
> insta-bitrot any patches that people have that mention "nsnull" anywhere, but 
> a shell script will be provided to auto-fix them, as with the PRBool switch 
> (something like "sed -i s/\bnsnull\b/nullptr/ .hg/patches{,-*}/*" should do 
> it).
> 
> 
> 
> This message is of general interest because after the switch, "nsnull" will 
> no longer work, and patch queues will have to be updated.  Also, anyone who 
> maintains a branch will want to figure out how to avoid merge pain.

This is now done on m-c:

http://hg.mozilla.org/mozilla-central/rev/b5c4b792f3f2

Ehsan is going to watch the tree and handle the m-i merge.  To un-bitrot your 
Mercurial patches, you can use the script provided here:

https://bugzilla.mozilla.org/show_bug.cgi?id=626472#c40
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