How can I modify elements in a std::vector using iterators?

How can I modify elements in a std::vector using iterators?

You can use iterators to traverse the vector and modify elements directly. For example, you can use a for loop with an iterator.

Can you show me a code example?

Sure! Here's a simple example:

#include <vector>
#include <iostream>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    for (auto it = vec.begin(); it != vec.end(); ++it) {
        *it *= 2; // Modify the element
    }
    for (const auto& val : vec) {
        std::cout << val << ' '; // Output modified elements
    }
}

This will double each element in the vector.

What if I want to remove elements while iterating?

You can use the erase method along with the iterator. Here's an example:

for (auto it = vec.begin(); it != vec.end(); ) {
    if (*it % 2 == 0) {
        it = vec.erase(it); // Remove even elements
    } else {
        ++it; // Only increment if not erasing
    }
}