container_as_template_args

#include <iostream>
#include <string>
#include <vector>
#include <array>
#include <set>
#include <type_traits>

template <typename Container, typename = typename std::enable_if_t<std::is_same_v<typename Container::value_type, int>>>
std::string toString(const Container &c, char delimiter = ' ')
{
    std::string res;
    for (auto ele : c)
    {
        res += std::to_string(ele) + " " + delimiter;
    }

    if (!res.empty())
    {
        res.pop_back();
    }
    return res;
}

int main()
{
    std::vector<int> vec{1, 2, 3};
    std::array<int, 3> arr{1, 2, 3};
    std::set<int> set{1, 2, 3};

    std::cout << toString(vec) << std::endl;
    std::cout << toString(arr) << std::endl;
    std::cout << toString(set) << std::endl;
    return 0;
}