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

From: Ô¬Ïþ»Ô (farproc_at_[hidden])
Date: 2006-07-25 20:40:45

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