How do I use the erase function with std::vector in C++?

Can you explain how to use the erase function with std::vector in C++?

Sure! The erase function in std::vector removes elements from the vector. You can use it to remove a specific element or a range of elements.

How do I remove a specific element by value?

To remove a specific element by value, you can use the std::remove function followed by the erase method. For example:

#include <vector>
#include <algorithm>

std::vector<int> vec = {1, 2, 3, 4, 5};
vec.erase(std::remove(vec.begin(), vec.end(), 3), vec.end());

This will remove the value '3' from the vector.

What if I want to remove a range of elements?

To remove a range of elements, you can directly use the erase method with two iterators. For example:

vec.erase(vec.begin() + 1, vec.begin() + 3);

This will remove the elements at index 1 and 2.

Are there any performance considerations I should be aware of?

Yes, using erase can be costly because it may require shifting elements. If you frequently remove elements, consider using a different data structure like std::list.