[Boost-users] [boost-users][mpl, enable_if] checking if a type has specific dependant type

Hello, I'd like to define a trait that would evaluate to true for types that have some specific dependant type (DependentType), to use like this: template<class Type> func(int i, typename boost::enable_if::type* dummy = 0) { } I tried this way: template struct HasDependentType : mpl::false_ {}; template<class Type> struct HasDependentType : mpl::true_ {}; ...but it appears incorrect (partial specialization is never ised). Thanks in advance.