#include <functional>
 
struct lols {
    std::function<void()> mem;
    template<typename T> lols(T&& t)
    : mem(t) {}
    lols(lols&& other) { mem.swap(other.mem); }
    ~lols() { if (mem) mem(); }
};
 
template<typename T> lols finally(T&& t) {
    return lols { std::forward<T>(t) };
}
 
#include <iostream>
int print(int i)
{
    std::cout << i << ' '; 
    return i;
}
 
int main() {
    auto f = finally([] { print(13); });
    return print(0);
}

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