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 04:10:42

Joaquín Mª López Muñoz <joaquin <at> tid.es> writes:

> OK, I think I've got it: MSVC++ 6.5 behaves funny with static constants
> inside templates, as it does not see their correct value during template
> parsing. For instance, the following:
> 
>   #include <boost/config.hpp>
>   #include <boost/static_assert.hpp>
> 
>   template<typename T>
>   struct foo
>   {
>     BOOST_STATIC_CONSTANT(int,x=2);
>     BOOST_STATIC_ASSERT(x==2);
>   };
> 
>   int main()
>   {
>     return 0;
>   }
> 
> fails at the static assertion line (x is seen as 1, btw). After
> instantiation, however, the static constant holds the correct value,
> this phenomenon only happens at the parsing stage.

Does this change

  BOOST_STATIC_ASSERT(foo<T>::x==2); // qualified name

help?

> Is it OK to commit?
I'd rather disabled compile-time calculation.

--
Alexander