[boost] lexical_cast on the pocket pc

From: Matt Comi (mattcomi_at_[hidden])
Date: 2005-11-24 10:38:06

Hi,

I've written a functor (primarily for use with a std::map<string, ?>)  
that sorts numerically first and alphabetically second using  
lexical_cast. It looks like this:

     try
     {
         return lexical_cast<double>(lhs) < lexical_cast<double>(rhs);
     }
     catch (bad_lexical_cast&)
     {
         return lhs < rhs;
     }

...and it's been working nicely so far. However on the Pocket PC,  
each time an exception is raised by the lexical_cast, it takes about  
a quarter of a second to move on to the catch. Not very nice when the  
map is huge.

As far as I can tell, there is no way to say to ensure that a  
lexical_cast is going to be valid until you actually perform it. I'm  
hoping that I won't need to resort to duplicating the innards of  
lexical_cast in order to implement this function on the Pocket PC.

Any ideas?

Thanks all,

Matt.

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