Remove a range of elements from a vector in C++

In this post, we’ll see how to remove the range of elements from a vector between specified indices in C++.

We can use the public member function std::vector::erase of the container std::vector for removing a part of the vector between the specified indices.

We have two overloaded versions of the erase() function: the first one removes only a single element at the specified position, and the second one removes all elements between the specified range. The solution is feasible using either one of them:

1. Using `erase(const_iterator pos)` function

#include <iostream>

#include <vector>

#include <iterator>

template<typename T>

void slice(std::vector<T> &v, int m, int n)

{

int k = n - m + 1;

auto it = v.cbegin() + m;

while (it != v.cend() && k--) {

it = v.erase(it);

}

int main()

{

std::vector<int> v = { 1, 2, 3, 4, 9, 8, 7, 6, 5 };

int m = 4, n = 7;

slice(v, m, n);

for (int const &i: v) {

std::cout << i << ' ';

}

return 0;

}

Download Run Code

Output:

1 2 3 4 5

2. Using `erase(const_iterator first, const_iterator last)` function