#include <cstdio>
#include <functional>
#include <string_view>

class at_exit
{
public:
    template <class C2, class... A2>
    at_exit(C2 &&_c, A2 &&..._a)
        : function(
              std::bind_front(std::forward<C2>(_c), std::forward<A2>(_a)...)) {}
    at_exit(const at_exit &) = delete;
    at_exit(const at_exit &&) = delete;
    at_exit &operator=(const at_exit &) = delete;
    at_exit &operator=(const at_exit &&) = delete;
    ~at_exit() { function(); }

private:
    std::function<void()> function;
};

void msg(std::string_view s) { puts(s.data()); }

struct S1
{
    void operator()(std::string_view s) const { puts(s.data()); }
};

struct S2
{
    void print(std::string_view s) const { puts(s.data()); }
};

at_exit global1([] { puts("[global1]: lambda"); });
at_exit global2(msg, "[global2]: function");
at_exit global3(S1{}, "[global3]: struct::operator()");
at_exit global4(&S2::print, S2{}, "[global4]: struct::method");

int main()
{
    at_exit local1([] { puts("[local1]: lambda"); });
    at_exit local2(msg, "[local2]: function");
    at_exit local3(S1{}, "[local3]: struct::operator()");
    at_exit local4(&S2::print, S2{}, "[local4]: struct::method");
}