Iterators using ++<p>Write&#x2F;Read using &lt;&lt; and &gt;&gt;. Not a major problem, but it&#x27;s weird and not very useful when you&#x27;re trying to be C compatible.<p>You can index into a std::deque, but not a std::queue.<p>I&#x27;d also count the need for explicit in constructor declarations to be a similar kind of mistake.