From: Johan RÃ¥de (rade_at_[hidden])
Date: 2006-07-26 06:12:30
è¢æ™“辉 wrote:
> 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>("9999999999999999999999999999999999999999999999999999999999999999999999999999");
>
>
> 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
>
>
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I tested your example with VC++ 7.1, and it throws a bad_lexical_cast.
The problem you have has nothing to do with lexical_cast.
lexical_cast uses streams to do the conversion.
It seems that you use an implementation of the C++ standard library
with poorly implemented streams.
I see two options:
1. Write your own conversion routine by hand. (Not that hard.)
2. Get a better implementation of the C++ standard library.
You can not use atoi, for its behaviour is unspecified when the
conversion can not be carried out.
--Johan RÃ¥de