Namespaces
Variants
Views
Actions

std::array::operator[]

From cppreference.com
< cpp‎ | container‎ | array
Revision as of 22:12, 2 November 2012 by P12bot (Talk | contribs)

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.

Contents

Parameters

pos - position of the element to return

Return value

Reference to the requested element.

Complexity

Constant.

Example

The following code uses operator[] 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';
}

Output:

Second element: 4
All numbers: 5 4 6 8

See also

access specified element with bounds checking
(public member function) [edit]