From: Bob Hutchison <hutch@...>
Date: 2007-10-23T23:47:42+09:00
Subject: Re: pop/push, shift/unshift


On 23-Oct-07, at 10:37 AM, David A. Black wrote:
> On Tue, 23 Oct 2007, Jes˙s Gabriel y Gal·n wrote:
>
>> Fair enough, although the idea was to use such an object using just
>> queue semantics, so everybody knows what enqueue/dequeue do. Maybe
>> aliasing them in Array doesn't make sense: what about having those
>> alias in a class Queue < Array or in the instance of the array you
>> plan to use just as a queue?
>>
>> queue = []
>> class << queue
>>   alias :enqueue :push
>>   alias :dequeue :shift
>> end
>
> Now you're talking :-) You could even wrap it up like this:
>
> module Queue
>   def self.extend_object(o)
>     class << o
>       alias enqueue push
>       alias dequeue shift
>     end
>   end
> end
>
> q = [].extend(Queue)
>
> (I'm a big #extend fan.)
>
>
> David
>
>

This is potentially a troublesome implementation. I believe that the  
queue is going to grow and grow. See my other messages about the  
behaviour of un/shift.

Cheers,
Bob

----
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