< cpp‎ | container‎ | array

reference       operator[]( size_type pos );
(since C++11)
const_reference operator[]( size_type pos ) const;
(since C++11)
(until C++14)
constexpr const_reference operator[]( size_type pos ) const;
(since C++14)

Returns a reference to the element at specified location pos. No bounds checking is performed.


[edit] Parameters

pos - position of the element to return

[edit] Return value

Reference to the requested element.

[edit] Complexity


[edit] Notes

Unlike std::map::operator[], this operator never inserts a new element into the container.

[edit] Example

The following code uses operator[] to read from and write to a std::array<int>:

#include <array>
#include <iostream>
int main()
    std::array<int,4> numbers {2, 4, 6, 8};
    std::cout << "Second element: " << numbers[1] << '\n';
    numbers[0] = 5;
    std::cout << "All numbers:";
    for (auto i : numbers) {
        std::cout << ' ' << i;
    std::cout << '\n';


Second element: 4
All numbers: 5 4 6 8

[edit] See also

access specified element with bounds checking
(public member function)