By the requeriments specified by the std::input_iterator concept, (and supperior iterators seems to be the same), they have to provide copy and move constructors:

input_iter<T>(const input_iter<T>& other) = default;
input_iter<T>(input_iter<T>&& other) noexcept = default;

Can they be defaulted? The typical implementation contains a private member pointing to some data:

private:
T* data;

Is in iterators a shallow copy/move the desired behaviour? I mean, copy/move the pointer itself, or must implement an explicit deep copy?

CodePudding user response：

Iterators don't own the pointed object, they just point to it. So copying whatever member pointers suffices.