How to specialize a template function for enum, and specific type?

Question

I currently have a function:

template 
bool func(T &t, int x)
{
    // do stuff...
}

However I would like to have thr

Answer 1

Use tag dispatching:

namespace details {
  template
  bool func( T& t, int x, std::true_type /* is_enum */, std::false_type ) {
  }
  template
  bool func( T& t, int x, std::false_type, std::true_type /* unsigned char */ ) {
  }
  template
  bool func( T& t, int x, std::false_type, std::false_type ) {
    // neither
  }
}
template
bool func( T& t, int x ) {
  return details::func( t, x, std::is_enum{}, std::is_same{} );
}