Re: Fast enumeration

[Fred Kiefer]

Am 09.02.2011 11:05, schrieb David Chisnall:
> On 9 Feb 2011, at 06:44, Riccardo Mottola wrote:
> 
>> If you want to expose this macro by default in base, I'd refrain
>> from that. However, I guess it can be exposed if Libobjc-2 is used:
>> the correlation with the newer library version and c99 is probably
>> 1. Pre-C99 support (which I guess sums up in gcc-2.95) can be left
>> to Objc-1.x and in this case the fast enumeration macro could be
>> hidden.
>> 
>> Of course, if Nikolaus comes up with a generic solution, no
>> objections at all.
> 
> I'm already using the GSFastEnumeration macros in -base, and have
> been for about six months.  If they are relying on C99 features that
> I didn't notice, no one has reported compilation failures in this
> time.
> 
> Unlike the enumerator solution, this gives the same performance and
> thread-safety as fast enumeration.  I'm not sure what the problem is.
> I didn't put them in the public headers location, because emulating a
> compiler in the preprocessor seems ugly to me, but if they're
> generally useful then we can move them there.
> 
> I also have some similar macros that provide a fast-enumeration style
> macro for iterating over characters in a string, which I should
> probably add in the same place - there are a few places where we are
> doing very slow string iteration in -base.

I think Riccardo was referring to the macros that where proposed by Jens
in his original mail. You know how he reacts on seeing C99 mentioned.
As far as I know your macros should be fine even by Riccardo's standards
and I really would like to see them in a public header. We should let
Richard decide which one.

Not sure about the string iteration though.

Cheers
Fred