Re: [boost] [TTI] macro to "box" types for subsequent traits extraction?

On Wed, May 7, 2014 at 2:03 AM, Edward Diener wrote:

Could you look at the documentation for BOOST_TTI_MEMBER_TYPE in the section called "Nested Types" of the TTI documentation ? I think you can easily adapt this to the purposes of your example.

Thanks! The closely related BOOST_TTI_TRAIT_MEMBER_TYPE does exactly what I need: #include #include // define class template X_trait with nested member type X BOOST_TTI_TRAIT_MEMBER_TYPE(X_trait, X) // convenient type extraction which defaults to int template<class T> using X_trait_t = typename X_trait::type; struct T1 { /* X defaults to int */ }; struct T2 { using X = char; }; int main() { static_assert(std::is_same::value, ""); static_assert(std::is_same::value, ""); }