From: Robert Klemme <shortcutter@...>
Date: 2009-01-23T06:28:24+09:00
Subject: Re: String doesnt auto dup on modification

On 22.01.2009 12:23, Brian Candler wrote:
> RK Sentinel wrote:
>> I guess I'll just have to remember not to modify a string I take from 
>> another class.
> 
> Or as was said earlier on: simply don't use destructive string methods 
> unless you really have to. Pretend that all strings are frozen.
> 
> You can enforce this easily enough in your unit tests: e.g. you could 
> pass in strings that really are frozen, and check that your code still 
> works :-)

Well, this is only half of the story: it does not save you from outside 
code changing the instance under your hands.  Aliasing works both ways, 
i.e. you can screw up the receiver but also the caller. :-)

Cheers

	robert

-- 
remember.guy do |as, often| as.you_can - without end