std::deque<T,Allocator>::operator[]

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< cpp‎ | container‎ | deque

C++
Containers library
std::deque
Member types
Member functions
Non-member functions
(until C++20) (until C++20) (until C++20) (until C++20) (until C++20)
Deduction guides(C++17)
reference operator[]( size_type pos );
 (1)
const_reference operator[]( size_type pos ) const;
(2)

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

Parameters

pos - position of the element to return

Return value

Reference to the requested element.

Complexity

Constant.

Notes

Unlike std::map::operator[]

Example

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

Run this code
#include <deque>
#include <iostream>
 
int main()
{
    std::deque<int> 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';
}

Output: 

Second element: 4
All numbers: 5 4 6 8

See also

 access specified element with bounds checking
(public member function)
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