How do I compare iterators in a C++ std::vector?

How do I compare iterators in a C++ std::vector?

In C++, you can compare iterators using relational operators like <, >, <=, >=, ==, and !=. For example, if you have two iterators, it1 and it2, you can check if they point to the same element with it1 == it2.

Can you give me an example of comparing two iterators?

Sure! Here's a simple example:

std::vector<int> vec = {1, 2, 3, 4, 5};
auto it1 = vec.begin();
auto it2 = vec.begin() + 2;
if (it1 < it2) {
    std::cout << "it1 points to an element before it2";
}

What happens if I compare iterators from different vectors?

Comparing iterators from different vectors is undefined behavior. You should only compare iterators that belong to the same container.

Are there any special considerations when using iterators?

Yes, make sure the iterators are valid and within the bounds of the vector. Also, avoid using iterators after the vector has been modified.