Re: Why use protocols?
Re: Why use protocols?
- Subject: Re: Why use protocols?
- From: Bob Ippolito <email@hidden>
- Date: Thu, 19 May 2005 16:16:13 -0400
On May 19, 2005, at 3:47 PM, Matt Neuburg wrote:
On Wed, 18 May 2005 20:03:05 +0200, Ondra Cada <email@hidden> said:
@implementation MyTableColumn
-dataCellForRow:(int)row {
id ds=[[self tableView] dataSource];
if ([ds respondsToSelector:@selector(dataCellForRow:sender:)])
return [ds dataCellForRow:row sender:self];
return [super dataCellForRow:row];
}
I completely agree in principle, and I do use this way too, but
IIRC my
experience has been that the compiler warns (it doesn't know at
compile time
that ds responds to dataCellForRow:sender:), whereas a formal protocol
prevents the warning... I may be misremembering, however.
An informal protocol (interface-only category on NSObject) also
prevents warnings.
-bob
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