Re: NSEnumerator and the missing peek method
Re: NSEnumerator and the missing peek method
- Subject: Re: NSEnumerator and the missing peek method
- From: "John C. Randolph" <email@hidden>
- Date: Thu, 29 Sep 2005 14:09:26 -0700
On Sep 29, 2005, at 1:53 PM, Jan Vereecken wrote:
Hello,
I'm currently busy with a project where I regularly make use of a
NSEnumerator object to iterate over a set of objects. The "problem"
I'm experiencing is that there is no method to peek at the next
object (for example [enumerator hasNext]). I circumvent the need to
peek via the enumerator with counting the objects of the enumerator
([[enumerator allObjects] count]) and check when the last element
is reached (and do something).
Bad idea. -allObjects will create a new array.
- Why didn't the AppKit developers include this (the hasNext
method) in the first place?
Probably because you can't always tell if there is a next object
until you try to obtain it. Remember, enumerators don't only
traverse arrays. They might be going through sets, and I could write
an enumerator that traverses a tree, which still behaves the same as
all other enumerators
-jcr
John C. Randolph <email@hidden> (408) 914-0013
Roaming Cocoa Engineer,
Available for your projects at great Expense and Inconvenience.
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