But the dereference operator invokes UB if there is no value. Which is a recurring theme in C++: the default behavior is unsafe (in order to be faster), and th

But the dereference operator invokes UB if there is no value. Which is a recurring theme in C++: the default behavior is unsafe (in order to be faster), and there is a method to do the safe thing. Which is exactly the opposite of what it should be.