finally.cpp

template<typename T>
class FinalAction 
{
    FinalAction(T f): clean(f) {}
    ~FinalAction() { clean(); }
    T clean;
}

template<typename T>
FinalAction<T> finally(T f)
{
    return FinalAction<T>(f);
}

void test()
{
    int* p = new int(7);
    auto f = finally([&p]() { delete p; });
    
    throw std::runtime_error("foo!");
}