simple scope exit

scope_exit.h

template <typename Func> struct scope_exit
{
    Func cleanup;

    scope_exit(Func &&f) : cleanup(std::forward<Func>(f)) {}
    ~scope_exit() { cleanup(); }
};

template <typename Func> scope_exit<Func> make_scope_exit(Func &&f)
{
    return scope_exit<Func>(std::forward<Func>(f));
}

#define SCOPE_EXIT_IMPL2(l, cl) auto SCOPE_EXIT_##l##_exit = make_scope_exit(cl)
#define SCOPE_EXIT_IMPL1(l, cl) SCOPE_EXIT_IMPL2(l, cl)
#define SCOPE_EXIT(...) SCOPE_EXIT_IMPL1(__LINE__, ([&] { __VA_ARGS__ }))