Re: (Newb) Populate NSMutableDictioanry with NSArray
Re: (Newb) Populate NSMutableDictioanry with NSArray
- Subject: Re: (Newb) Populate NSMutableDictioanry with NSArray
- From: Keary Suska <email@hidden>
- Date: Sun, 31 Aug 2008 14:21:32 -0600
- Thread-topic: (Newb) Populate NSMutableDictioanry with NSArray
8/31/08 2:34 AM, also sprach email@hidden:
> NSMutableDictionary * myCollection;
> myCollection = [[NSArray alloc] initWithObjects:@"a", @"b", @"c", nil];
>
> The types are not the same. So my first question is, is this a bug?
> And if so, why didn't the compiler catch it? I come from C# so unless
> NSMutableDictionary inherits NSArray this logic would not compile.
Yes, it is a "bug". Because the return type of -initWithObjects is "id",
which can represent any object, the compiler can't know that the types are
incompatible.
IIRC, you should get a compiler warning if you call a method that only
NSArray implements, such as -objectAtIndex:, on the myCollection object.
HTH,
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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