[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<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). Thanks in advance.
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
http://www.boost.org/libs/mpl/doc/refmanual/has-xxx-trait-def.html
In Christ, Steven Watanabe
Great, exactly what I need. Thanks a lot.
participants (2)
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Igor R -
Steven Watanabe