Iterators using ++ Write/Read using << and >>. Not a major problem, but it's weird and not very useful when you're trying to be C compatible. You can index in

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