Re: best practice: error handling

["Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr>]

Le Tue, 31 May 2011 19:13:16 +0200, Vinzent Hoefler  
<0439279208b62c95f1880bf0f8776eeb@t-domaingrabbing.de> a écrit:
> If you kind of expect the call to fail under normal conditions, a proper
> out-Parameter (like "Success" ;) can be added.
>
> Keep in mind, that returning some error requires a function, and until  
> now
> functions can't have "out"-parameters, so returning an "error code" is  
> only
> possible for those subroutines which do not need to have  
> "out"-parameters.
I strongly suspect this is precisely the reason why Ada 2012 will add out  
parameters to function ;)
First, I though this was a silly idea, and later, from time to time, I  
though this was indeed a good idea, at least to return status from  
function, without the need to define wrapper types every where (at least,  
while Ada do not have provision to return proper tuples like functional  
languages do). Moreover, a function may still be conceptually Pure, even  
with out parameters ;)

-- 
“Syntactic sugar causes cancer of the semi-colons.”  [Epigrams on  
Programming — Alan J. — P. Yale University]
“Structured Programming supports the law of the excluded muddle.” [Idem]
“c++; /* this makes c bigger but returns the old value */” [Anonymous]