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

AMDG Igor R wrote:

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<HasDependentType<Type> >::type* dummy = 0) { }

I tried this way:

template<class Type, class Enable = void> struct HasDependentType : mpl::false_ {}; template<class Type> struct HasDependentType<Type, typename Type::DependentType> : mpl::true_ {};

...but it appears incorrect (partial specialization is never ised).

http://www.boost.org/libs/mpl/doc/refmanual/has-xxx-trait-def.html In Christ, Steven Watanabe