Re: protocol not seeing superclass implementation : bug or feature?
Re: protocol not seeing superclass implementation : bug or feature?
- Subject: Re: protocol not seeing superclass implementation : bug or feature?
- From: Christophe Dore <email@hidden>
- Date: Thu, 28 Mar 2002 12:18:40 +0100
Well, in a simpler way, just add a category to NSView that declares it
respects your protocol.
@interface NSView (MyRectangle) <MyRectangle>
@ end
Thus, any NSView sill respect your protocol (as a matter of fact, it does).
Nathan Day wrote:
Protocols don't work like this unfortunately but you can get a similar
effect by implementing the formal protocol as part of an informal
protocol, that is a category of the class with no implementation block.
for example
#import <AppKit/AppKit.h>
@protocol MyRectangle
- (NSRect)bounds;
@end
@interface TestView : NSView {
}
@end
@interface TestView (MyRectangle) <MyRectangle>
@ end
On Wednesday, March 27, 2002, at 06:26 PM, Michael B. Johnson wrote:
So let's say I have the following code in my TestView.h:
#import <AppKit/AppKit.h>
@protocol MyRectangle
- (NSRect)bounds;
@end
@interface TestView : NSView <MyRectangle> {
}
@end
When I compile, I get:
TestView.m:26: warning: incomplete implementation of class `TestView'
TestView.m:26: warning: method definition for `-bounds' not found
TestView.m:26: warning: class `TestView' does not fully implement the
`MyRectangle' protocol
which, given that NSView *does* implement this method, and TestView
clearly inherits from NSView, it seems silly for the compiler to
complain. Is this somehow a feature, and I'm missing it? Or is this a
genuine bug? If it's not a bug, what's the best way to not get the
error - I can obviously declare and then implement
- (NSRect)bounds {
return [super bounds];
}
but that seems silly (or again, maybe not - I think I'm just not seeing
some obvious feature of this).
Thanks for any insight.
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