Function that only accepts enumeration types

Question

Man, I can't stand this damn templates no mo'

So suppose I have this function...

void sort(vector<int>& vec)
{
    // stuff
}

How can I make that function accept vectors of all enumeration types without overloading it 10 goddamn times?

I don't know much about templates but was thinking about doing something like this... (which gave me the error: type name is not allowed)

template<typename T, std::enable_if_t<std::is_enum<T>>>
void sort(vector<T>& vec)
{
    // stuff
}

Answer 1

Just if you use fresh C++ (what I recommend if possible). There is a working example using concepts (c++20). Just tested at gcc 10

#include <type_traits>
#include <vector>
#include <concepts>

template<typename T> requires std::is_enum<T>::value
void sort(std::vector<T> & vec)
{
        // stuff
}

int main()
{
        enum Mew
        {
            neat,
            ugly
        };

        std::vector<Mew> v;
        sort(v);               //works

        std::vector<int> v_int;
        sort(v_int);           //error here

        return 0;
}