RE: [boost] lexical_cast to unsigned

From: Fernando Cacciola (fcacciola_at_[hidden])
Date: 2001-12-07 17:47:09

----- Original Message -----
From: rogeeff <rogeeff_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Friday, December 07, 2001 7:09 PM
Subject: [boost] lexical_cast to unsigned

> Hi,
>
> Is it possible to make the lexical_cast to throw an exception in this
> case:
>
> #include <boost/lexical_cast.hpp>
> using namespace boost;
>
> int main()
> {
>     unsigned int i;
>
>     i = lexical_cast<unsigned int>( "-10" );
>
>     return i;
> }
>
>
Probably not, but right now I'm finishing the documentation of the improved
numeric_cast<> that I will submit for formal review very very soon. With it,
you will be able to do this:

#include <boost/lexical_cast.hpp>
#include <boost/numeric_cast.hpp>  // improved
using namespace boost;

int main()
{
    unsigned int i;

   try
   {
      i = numeric_cast<unsigned int>(lexical_cast<int>( "-10" ));
   }
   catch ( boost.:negative_overflow )
   {
   }

     return i;
}

Among other useful things!

You can see the *previous* version of this at:

http://groups.yahoo.com/group/boost/files/improved_numeric_cast

Fernando Cacciola
Sierra s.r.l.
fcacciola_at_[hidden]
www.gosierra.com