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vector data() function in C++ STL

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  • Difficulty Level : Basic
  • Last Updated : 09 Jun, 2022
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The std::vector::data() is an STL in C++ which returns a direct pointer to the memory array used internally by the vector to store its owned elements. 


Parameters: The function does not accept any parameters.
Return value: The function returns a pointer to the first element in the array which is used internally by the vector.

Time Complexity – Constant O(1)

Below program illustrate the above function:


// C++ program to demonstrate the
// vector::date() function
#include <bits/stdc++.h>
using namespace std;
int main()
    // initialising vector
    vector<int> vec = { 10, 20, 30, 40, 50 };
    // memory pointer pointing to the
    // first element
    int* pos =;
    // prints the vector
    cout << "The vector elements are: ";
    for (int i = 0; i < vec.size(); ++i)
        cout << *pos++ << " ";
    return 0;


The vector elements are: 10 20 30 40 50 
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