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How to Check if a Vector is Empty in C++?

Last Updated : 23 Jul, 2025

A vector is said to be empty when there are no elements present in vector. In this article, we will learn different ways to check whether a vector is empty or not.

The most efficient way to check if the vector is empty or not is by using the vector empty() function. Let’s take a look at a simple example:

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<int> v;

    // Checking if vector is empty or not
    if (v.empty())
        cout << "Empty";
    else
        cout << "Not Empty";
    return 0;
}

Explanation: The vector empty() function will return true, if the std::vector is empty, otherwise returns false.

C++ provides more ways to check whether the vector is empty or not. They are as follows:

The vector size() method returns the number of elements present in the vector, so if the vector is empty then size() function will return 0.

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<int> v;

    // Checking if vector is empty or not
    if (v.size() == 0)
        cout << "Empty";
    else
        cout << "Not Empty";
    return 0;
}

The vector begin() and vector end() returns the iterator to the beginning and the end of the vector respectively. If the vector is empty, both the iterators will be equal.

#include <bits/stdc++.h>
using namespace std;

int main() {
    vector<int> v;

    // Checking if vector is empty or not
    if (v.begin() == v.end())
        cout << "Empty";
    else
        cout << "Not Empty";
    return 0;
}

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