Get random template paramter

main.cpp

#include <cstdlib>
#include <ctime>

template<typename Head, typename... Tail>
constexpr int count_template_parameter(const Head &) {
    return 1;
}

template<typename Head, typename... Tail>
constexpr int count_template_parameter(const Head &, const Tail & ...tail) {
    return 1 + count_template_parameter(tail...);
}

template<typename Head, typename... Tail>
const Head & get_template_parameter(int i, const Head & h) {
    return h;
}

template<typename Head, typename... Tail>
const Head & get_template_parameter(int i, const Head & head, const Tail & ...tail) {
    if(i == 0) return head;
    return get_template_parameter(i-1, tail...);
}

template<typename... Vargs>
const auto & random_template_parameter(const Vargs & ...args) {
    int i = rand() % (count_template_parameter(args...));
    return get_template_parameter(i, args...);
}

int main() { 
    srand (time(NULL));
    return random_template_parameter(1,114,42,7,8,6);
}