[boost] Re: lexical_cast with default value

From: Dave Dribin (dave-ml_at_[hidden])
Date: 2005-04-25 09:40:10

Did anyone ever get a chance to look at this feature and patch?  I 
could do the documentation updates, too, if desired.

-Dave

On Apr 15, 2005, at 3:05 PM, Dave Dribin wrote:

> Hi all,
>
> I recently discovered lexical_cast, and it's very nice and elegant.  
> I'd like to put in a feature request, though: the ability to use a 
> default value rather than throwing an exception on conversion failure. 
>  Basically, it would take a second argument that would be the value 
> returned if the conversion fails.  This could be used directly in the 
> example, like:
>
>     std::vector<short> args;
>
>     while(*++argv)
>     {
>         args.push_back(lexical_cast<short>(*argv, 0));
>     }
>
> This eliminates the throwing and catching of an exception for cases 
> where conversion failure is not an exceptional.
>
> I've attached a patch to lexical_cast.hpp found in Boost 1.32.0
>
> -Dave