I need to create a template function like this:

template<typename T>
void foo(T a)
{
   if (T is a subclass of class Bar)
      do this
   else
      do something else
}

I can also imagine doing it using template specialization ... but I have never seen a template specialization for all subclasses of a superclass. I don't want to repeat specialization code for each subclass

c++ templates template-specialization
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