Re: [Boost-users] puzzle with enable_if

Hi John, John Dlugosz wrote:

I'm using the Microsoft 2008 compiler.

The template

template struct is_proper_TD_types : std::tr1::integral_constant

is_Universal_time_API<T>::value &&

(std::tr1::is_same::value ||

std::tr1::is_same::value ||

std::tr1::is_same::value ||

is_dimensional_time<D>::value) {};

gives an error "'T': must be a class or namespace when followed by '::'" when T is int.

Move the integral constant type you are deriving from to the template parameter list for SFINAE to apply. In this case that'll be: template ::value || std::tr1::is_same::value || std::tr1::is_same::value || is_dimensional_time<D>::value) > > struct is_proper_TD_types : Enable {}; Please let me know if this works for you. HTH, Gevorg P.S. BTW, has my suggestion in the thread "Choosing a variable size" worked for you?