Invalidating list iterator

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To retrieve the end of a directory, the class must be instantiated with the default constructor.

Entries can be created or deleted while iterating without invalidating the iterator.

All standard containers support at least forward iterator types.

Bidirectional iterators are like forward iterators but can also be iterated through backwards.

No contained elements are accessed by the call, but the iterator returned can be used to access or modify elements.

Concurrently accessing or modifying different elements is safe.

Make sure you visit this Iterator Status documentation to know more details of it.

An iterator is any object that, pointing to some element in a range of elements (such as an array or a container), has the ability to iterate through the elements of that range using a set of operators (with at least the increment () has a specific iterator type designed to iterate through its elements.

Does the position of the iterator before the insertion/removal matter? (Hadn't thought about it, but it would invalidate all iterators at the point of insertion and beyond in all cases.

Returns an iterator pointing to the first element in the list container.

Notice that, unlike member list::front, which returns a reference to the first element, this function returns a bidirectional iterator pointing to it.

Then again, vectors are most frequently added to at the end of the container, so there's normally nothing to invalidate.) Deletion from a vector invalidates that iterator and all iterators past it.

Well, it's implementation dependent and there might be some implementer that does something else (perhaps using malloc to reserve a piece of memory and then use placement new or something).

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