From: Martin DeMello <martindemello@...>
Date: 2002-12-01T07:00:12+09:00
Subject: Re: [OT] Re: RCR: Stack, Queue alias methods in Array

MikkelFJ <mikkelfj-anti-spam@bigfoot.com> wrote:
> 
> "Martin DeMello" <martindemello@yahoo.com> wrote in message
> news:mV2G9.79479$ea.1364198@news2.calgary.shaw.ca...
>> Puzzle: There's a common occurrence of a doubly broken abstraction.
>> Physically, the structure most resembles a stack; that is, inserting and
>> removing are both trivial from the front end. However, people of one
>> type go out of their way to insert objects in the back end, trying to
>> convert the stack into a queue. And after that, the other class of
>> people go out of their way to *remove* objects from the back end,
>> turning the queue into a stack facing the other way, even though
>> insertion and deletion from that end are both O(n). What am I talking
>> about?
> 
> People shopping - fresh milk goes to the back of the queue.
> Classes: customers and employees.

Got it in one :)

martin