On Sun, Nov 1, 2009 at 9:19 PM, John Joyce
<dangerwillrobinsondan...@gmail.com> wrote:
> Is it possible to create an NSCharacterSet constant?
No. By definition, constants are assigned values at compile time.
Objects other than strings can only be created at runtime. There is
no way around this fact.
> Is it best just to declare a global constant string, then initialize an
> NSCharacterSet during app initialization? It certainly seems that is the
> only real option.
Answers will vary. You could use a static global variable which is
assigned in +initialize, or you could use a static variable in a
category on NSCharacterSet, or a number of other things. Basically
what you really want is a singleton, not a constant.
I'm partial to the following construct:
+ (Foo *)sharedFoo {
static Foo *sharedFoo;
dispatch_once_t once;
dispatch_once(&once, ^{ sharedFoo = [[foo alloc] init]; }
return sharedfoo;
}
--Kyle Sluder
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