[Boost-users] Re: C++ Template Metaprogramming - Exercise 2-0

Ben Hutchings wrote:

Well the first attempt doesn't solve the problem because it requires an extra parameter. The second attempt solves it but I don't think you're supposed to make use of other templates.

Any solutions is allowable, though that one is not particularly elegant.

I think the expected solution would be more like this:

template<typename T> struct add_const_ref { typename T const & type; };

template<typename T> struct add_const_ref { typename T & type; };

Actually there's a much more concise solution using the type traits library. That is, after all, the focus of the chapter. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com