From: Hal Fulton <hal9000@...>
Date: 2004-04-24T05:09:42+09:00
Subject: Re: StringIO

why the lucky stiff wrote:
> Hal Fulton wrote:
> 
>> I've been playing with StringIO, and I've found that it doesn't inherit
>> from IO.
>>
>> I had thought this would be natural, as it would in theory permit us to
>> use a StringIO wherever an IO is used.
> 
> 
> I don't know exactly what you're getting at, but, in watching checkins 
> on Ruby CVS, anything that read:
> 
>   if obj.is_a? IO
> 
> was swapped to:
> 
>  if obj.respond_to? :read
> 
> over the last year.  I'm not saying StringIO shouldn't inherit from IO.  
> Just that it's become less important what descends from IO and more 
> important what implements obj#read.

Oh, certainly, I agree.

But I tried to use #select with a StringIO and it complained.
(If this is unreasonable, tell me, but it's not obvious to me.)


Hal