How does std::remove_if work in C++?

Can you explain how std::remove_if works in C++?

Sure! std::remove_if is a function that removes elements from a container based on a predicate.

What does the predicate look like?

The predicate is a function or a lambda that returns true for elements to be removed and false for those to keep.

Can you give me a code example?

Absolutely! Here's a simple example:

#include <vector>
#include <algorithm>

std::vector<int> vec = {1, 2, 3, 4, 5};
vec.erase(std::remove_if(vec.begin(), vec.end(), [](int x) { return x % 2 == 0; }), vec.end());

This removes all even numbers from the vector.

What does the erase function do in this context?

The erase function actually removes the elements from the vector after std::remove_if has shifted the elements to be kept to the front.