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Re: Types for the method have to conform?

Subject: Re: Types for the method have to conform?
From: Sherm Pendley <email@hidden>
Date: Wed, 10 Aug 2005 22:04:58 -0400
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On Aug 10, 2005, at 9:11 PM, John Calsbeek wrote:

I've got a method declared as follows:
- (id)initWithData:(NSData *)data options:(NSDictionary *)options error:(NSError **)errorPtr;

I've been running into a certain problem in which gcc seems to think that the actual signature is:

- (id)initWithData:(NSData *)data options:(unsigned int)options error:(NSError **)errorPtr;

because every other method using the selector initWithData:options:error: uses that signature. Will I be perpetually haunted by those warnings when I compile, or will I have to switch to an unsigned int for options?

You need to declare the type of the object you're sending these messages to. If you declare it as "id", you'll get warnings because the compiler finds multiple signatures and doesn't know which one applies.

In other words, instead of writing this:

    id foo = [[FooMatic alloc] initWithData ...];

Write it like this:

    FooMatic *foo = [[FooMatic alloc] initWithData ...];

That way the compiler knows to use the signature found in the FooMatic class for that method.

sherm--

Cocoa programming in Perl: http://camelbones.sourceforge.net
Hire me! My resume: http://www.dot-app.org

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	>Types for the method have to conform? (From: John Calsbeek <email@hidden>)

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