How do I use std::vector::assign in C++?

Can you explain how to use std::vector::assign in C++?

Sure! The std::vector::assign function is used to assign new values to a vector, replacing its current contents.

What are the different ways to use the assign function?

You can use assign in several ways: you can assign a range of elements, a specific number of copies of a value, or even another vector.

Can you give me a code example?

Of course! Here's a simple example:

#include <vector>
#include <iostream>

int main() {
    std::vector<int> vec;
    vec.assign(5, 10); // Assigns 5 elements with the value 10
    for (int n : vec) std::cout << n << ' '; // Output: 10 10 10 10 10
}

This assigns five 10s to the vector.

What happens if I use assign on an empty vector?

If you use assign on an empty vector, it will simply fill the vector with the new values you provide, effectively resizing it.