From: Charles Hixson <charleshixsn@...>
Date: 2003-11-24T01:00:26+09:00
Subject: Re: retry does not work

T. Onoma wrote:

>Guy:
>
>  
>
>>T> ...
>> Then change it : your need of resume in this case...
>>    
>>
>
>...i have a user interface script that uses the library. things happen in the library and if the user has set verbose more i should be able to report them to the user ...
>-ts
>
To me it seems that to handle this concern, the proper approach is to 
raise the exception within the library, catch it within the library 
(actually, within the same routine if possible), if you can't handle it 
there, then print out your message and re-raise the exception.  Of 
course the "printing out of the message" could be handled via a call to 
a custom "message handler" routine that serves your needs, so you have 
extra place (probably within the library) to specialize things in a more 
global way.  "resume" is quite tricky if you don't know just where you 
will be resuming to (consider what would happen to an external routine 
that "resumed" a program structured as I'm proposing).  I feel that 
resume is normally best used within the same routine that threw the 
exception, and that any other use is...dangerous.  It is too likely that 
later editing will introduce side effects without seeing the problems 
that are being caused.