Re: NSEnumerator and the missing peek method
Re: NSEnumerator and the missing peek method
- Subject: Re: NSEnumerator and the missing peek method
- From: Jan Vereecken <email@hidden>
- Date: Thu, 29 Sep 2005 23:27:46 +0200
On 29 Sep 2005, at 23:01, Nick Zitzmann wrote:
On Sep 29, 2005, at 2:53 PM, Jan Vereecken wrote:
- Why didn't the AppKit developers include this (the hasNext
method) in the first place?
NSEnumerator isn't in the AppKit.
- How do other developers conquer this problem?
If you need to know what the next object is going to be, then you
probably shouldn't use NSEnumerator. Instead, use an array
iterator, like this: (warning - code written in Mail, untested, use
at your own risk, etc.)
unsigned int i;
const unsigned int count = [array count];
for (i = 0 ; i < count ; i++)
{
id object = [array objectAtIndex:i];
// and so on, and so on...
if (i+1 < count)
{
// peek at the next object here
}
}
That is the solution I use at the moment. I was only wondering if
someone maybe found a way to extend NSEnumerator with a new method to
peek which would make following code possible.
while(myObject = [enumerator nextObject]) {
do something (for example append a string)
if([enumerator hasNext]) {
do something (for example add a newline)
}
}
Java offers this functionality in their Iterator's and I was
wondering if the same was possible in Cocoa.
Nick Zitzmann
<http://www.chronosnet.com/>
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