template <typename F>
struct ScopeExit {
    ScopeExit(F f) : f(f) {}
    ~ScopeExit() { f(); }
    F f;
};

template <typename F>
ScopeExit<F> MakeScopeExit(F f) {
    return ScopeExit<F>(f);
};

#define SCOPE_EXIT(code) \
    auto STRING_JOIN2(scope_exit_, __LINE__) = MakeScopeExit([=](){code;})