#include <iostream>
 
template<typename T>
using IsEnumConcept = std::enable_if_t<std::is_enum<T>::value>;
 
template<typename T, typename = void>
struct OutImpl
{
	void operator()() const { std::cout<<"for not enum\n"; }	
};
 
template <typename T>
struct OutImpl<T, IsEnumConcept<T>>
{
	void operator()() const { std::cout<<"for enum\n"; }	
};
 
template<typename T>
void out()
{
	OutImpl<T>()();
}
 
enum class MyEnum{};
 
int main() {
	out<MyEnum>();
	out<int>();
}
 

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