Re: multiple declarations for method `length' ?
Re: multiple declarations for method `length' ?
- Subject: Re: multiple declarations for method `length' ?
- From: j o a r <email@hidden>
- Date: Thu, 30 Dec 2004 19:16:28 +0100
Please don't cross-post!
On 2004-12-30, at 19.05, Mark Dawson wrote:
When compiling this Obj-C line in XCode 1.5, I get the following
warning:
LengthParser.m:295: warning: multiple declarations for method `length'
short decimalLen = [[[NSUserDefaults standardUserDefaults]
objectForKey:NSDecimalSeparator] length];
What does this mean? It seems to run OK, producing the result (1 for
US system) that I'd expect…
If you check NSDictionary you'll find that:
- (id)objectForKey:(id)aKey
...it returns an "id" object. In other words, the compiler don't know
what type of object it is. When you call the method "length" on that
object, the compiler needs to guess what implementation to use. If
there is only one such method it's easy, but if there are several it's
not. You can help the compiler by casting:
NSString *str = [[NSUserDefaults standardUserDefaults] objectForKey:
NSDecimalSeparator];
short decimalLen = [str length];
or
short decimalLen = [(NSString *)[[NSUserDefaults standardUserDefaults]
objectForKey:NSDecimalSeparator] length];
j o a r
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