#include <type_traits>
 
template <typename T>
using EnableIfInt =
  std::enable_if_t<std::is_arithmetic<T>::value>;
 
template <typename T, typename Enable = void>
class Class {
  static_assert(sizeof(T) == 0, "Nie wolno");
};
 
template <typename T>
class Class<T, EnableIfInt<T>> {
public:
    Class() {};
    void Method();
};
 
template <typename T>
void Class<T, EnableIfInt<T>>::Method() {
 
}
 
int main() {
    Class<int> class1;
    // Class<int [2]> class2;
    class1.Method();
}

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