Re: [Boost-users] How to cast form string to number safely?

From: Meißner, Joachim [Rohmann GmbH] (meissner_at_[hidden])
Date: 2006-07-26 08:02:00

Is it possible that you have disabled exceptions in your project?

Regards, Joachim
> Dear boost-users:
> 
> I am really sorry for asking shch a silly question, but I 
> really need your help!
> 
> boost::lexical_cast is a great function to do casting. If I 
> want is to cast from string to a "long long" type value, I 
> can use the follow: 
> 
> long long llVar = lexical_cast<long long>("123456789");
> 
> It is alright in this circs, but what if:
> 
> lexical_cast<long 
> long>("9999999999999999999999999999999999999999999999999999999
> 999999999999999999999"); 
> 
> This is an obvious overflow, but I have no way to handle this 
> error, it returns a wrong number without throwing an exception!
> 
> Any suggestion? Thank you very much!!!
> 
> Kevin 
> 
>