#include <iostream>
using namespace std;
 
#include <tuple>
#include <string>
 
template <typename Functor, typename Arg>
decltype(auto) call(Functor f, Arg &&arg) { // (1)
    std::cout << "Base case" << std::endl;
}
 
template <typename Functor, typename... Args>
decltype(auto) call(Functor f, std::tuple<Args...> &&args) { 
    std::cout << "TTT" << std::endl;
}
 
int main() {
 
   call(1,std::tuple<int>{1});
   call(1,2);
 
   std::tuple<int> ti{5};
   call(1,ti);
   call(1,std::move(ti));
 
 
}

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