template compile OTM

main.cpp

#include <iostream>
#include <tuple>

template <int n> auto foo(int a) {
    return std::make_tuple(foo<n - 1>(a), foo<n - 1>(a));
}

template <> auto foo<0>(int a) { return std::make_tuple(a, a); }

int main() {
    auto i = foo<100>(2);
    std::cout << &i << std::endl;
}