traverse variadic template pramater pack in forward and backward mode

param_pack_traverse.cpp

#include <vector>
#include <list>
#include <iostream>
#include <iterator>
#include <algorithm>
#include <set>
#include <optional>
#include <tuple>

template <typename T>
class type_identity {
public:
    using type = T;
};

template <typename... Ts>
void print(Ts... ts) {
    auto _print = [] (auto t) {
        std::cout << t << std::endl;
        return type_identity<void>{};
    };
    (_print(ts) = ...);
    (_print(ts) , ...);
}

int main()
{
    print(1, 3.14, "abc");
    return 0;
}