How to Erase Elements from a C std::vector by Index?

Erasing Elements from std::vector by Index

In C , std::vector is a container that efficiently stores elements in contiguous memory locations. To remove elements from a vector, the erase function is employed.

Problem: Given a std::vector, deleting the element at a specific index.

Example:

std::vector<int> vec;

vec.push_back(6);
vec.push_back(-17);
vec.push_back(12);

vec.erase(???); // How to delete the second element?

Solution:

To erase a single element by index, use std::next to increment the vector iterator by the desired index:

vec.erase(std::next(vec.begin(), elementIndex));

To erase a range of elements, specify the beginning and end iterators:

int startIndex = 1;
int endIndex = 3;

vec.erase(std::next(vec.begin(), startIndex), std::next(vec.begin(), endIndex));

In the provided example, the following code will delete the second element (vec[1]):

vec.erase(std::next(vec.begin()));

For deleting the second and third elements, use:

vec.erase(std::next(vec.begin(), 1), std::next(vec.begin(), 3));

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