Re: [Boost-users] Looking for more advanced type_traits-likefunctionality

I have took a look at some parts of the boost library, but I couldn't find what I want, and

that is something like this: How can I determine if a type T has such and such member? It

would look like something like this:

has_member::result (true if T::paint() exists) has_member::result (true if T::m_size exists)

The closest to this I could find is boost::type_traits but that does not provide this

functionality.

There are two problems: 1) You have to write a separate traits class for every member that you want to detect, there is no real way to boilerplate this. 2) The techniques used are only supported on a minority of current compilers. However, take a look at http://lists.boost.org/MailArchives/boost/msg52178.php for a working example. Also if you want to detect member types (as opposed to member functions) then there is an almost-boilerplate example in boost/mpl/_aux/has_xxx.hpp. John.