How do I use const iterators with std::vector in C++?

Can you explain how to use const iterators with std::vector in C++?

Sure! In C++, a const iterator allows you to traverse a vector without modifying its elements. You can use it like this:

Could you show me a code example?

Of course! Here's a simple example:

#include <iostream>
#include <vector>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    std::vector<int>::const_iterator it;

    for (it = vec.cbegin(); it != vec.cend(); ++it) {
        std::cout << *it << " ";
    }
    return 0;
}

This code uses cbegin() and cend() to get const iterators.

What happens if I try to modify an element using a const iterator?

If you try to modify an element using a const iterator, you'll get a compilation error. Const iterators are designed to prevent modifications.

Are there any performance differences between const and non-const iterators?

Generally, there are no significant performance differences. The choice between them should be based on whether you need to modify the elements or not.