Den 03-11-2010 19:50, Nevin Liber skrev:
It certainly isn't something I'd like to see in Boost.Any, as that isn't usually what people mean by equality comparable. Take the following example given the semantics you propose:
boost::any x(0); boost::any y(x);
assert(x == y); // fails
One that forwards the work to (lhs == rhs) for the underlying objects is much more interesting, but would require extending Boost.Any to implement it. It also means defining semantics for:
1. What to do if they hold the same type 2. What to do if they hold different types 3. What to do if one side is not a Boost.Any object 4. What to do if operator== isn't defined for the types involved
My armchair answers: 1. Forward to the expression lhs == rhs for the held objects 2. Forward to the expression lhs == rhs for the held objects
2. return false? -Thorsten