Re: [boost] [lexical_cast][STLport 4.5.3][trunk] static assertion failed in boost/detail/lcast_precision.hpp

From: Alexander Nasonov (alnsn_at_[hidden])
Date: 2007-10-09 04:04:46

Paul A Bristow <pbristow <at> hetp.u-net.com> writes:
> Although I made some input on this, I'm not the maintainer for
> lexical_cast (and don't have thiese platforms to test).
> 
> Maintainer is Alexander Nasonov [alexander.nasonov <at> gmail.com])
> but in case he isn't listening:

I'm listening but I couldn't reply last few times because gmane
rejects to send my messages. Sorry to all who didn't get a reply.

I don't have an access to this complier either.

> I can't see an obvious cause (presume it works OK on other platforms),
> so I can only suggest breaking this down into separate
> assertions to see which one is causing the trouble,
> and perhaps getting the values of std::limits<T>::digits and
> boost::is_abstract<T>.
> 
> It seems that the suitable precision (decimal digits to use to
> get the full accuracy for type T) can't be calculated.
> 
> It would also be useful to see what T is?  Is this some funny
> type for which std::numeric_limits isn't properly specialised?

There is no specialication at all in the example:

> #include <boost/lexical_cast.hpp>
> int main()
> {
>  return 0;
> }

Joaquín, can you try

#include <boost/detail/lcast_precision.hpp>
int main() {}

and then break this assertion down to see which part is failing?

If it doesn't help, you can disable precision calculation at compile-time.
Currently, it's disabled only if BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
is defined but of course it can be changed.

--
Alexander