将迭代器返回到STL容器中的元素

Question

您如何检查该函数返回的迭代器是否指向容器类中的某个东西？

Answer 1

Iterators are passed around as [begin,end) pairs, with the end value signifying "not found" or other forms of the empty sequence. Return that from your function, or return a pair<bool,iterator> (or similar).

Answer 2

You can't. Make sure you return a valid iterator.

Well I suppose you could by iterating through the container and checking to see if the iterators are equal. But that would be horrid.