Check if a class has a member function of a given signature

Question

I\'m asking for a template trick to detect if a class has a specific member function of a given signature.

The problem is similar to the one cited here http://www.go

Answer 1

To be non-intrusive, you can also put serialize in the namespace of the class being serialised, or of the archive class, thanks to Koenig lookup. See Namespaces for Free Function Overrides for more details. :-)

Opening up any given namespace to implement a free function is Simply Wrong. (e.g., you're not supposed to open up namespace std to implement swap for your own types, but should use Koenig lookup instead.)