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

Turn out the comment about overload into answer:

// For enum
template<typename T>
typename std::enable_if<std::is_enum<T>::value, bool>::type
func(T& t, int x);

// for unsigned char
bool func(unsigned char& t, int x);

// for other
template<typename T>
typename std::enable_if<!std::is_enum<T>::value, bool>::type
func(T& t, int x);

Live example

An alternative is to use specialization for unsigned char:

// for other
template<typename T>
typename std::enable_if<!std::is_enum<T>::value, bool>::type
func(T& t, int x);

// specialization for unsigned char
template <>
bool func(unsigned char& t, int x);

Live example

Answer 2

Use tag dispatching:

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