Restrict C++ Template Parameter to Subclass

Question

How can I force a template parameter T to be a subclass of a specific class Baseclass? Something like this:

template 

        

Answer 1

You don't need concepts, but you can use SFINAE:

template 
boost::enable_if< boost::is_base_of::value >::type function() {
   // This function will only be considered by the compiler if
   // T actualy derived from Base
}

Note that this will instantiate the function only when the condition is met, but it will not provide a sensible error if the condition is not met.