std::deque operator[]

od C++98

// Non const version
reference operator[]( size_type pos );

// Const version
const_reference operator[]( size_type pos ) const;

Returns a reference

to the element at specified index pos.

important

No bounds checking is performed, using an element out of bounds is undefined behavior

.

Parameters

• pos - position of the element to return

Return value

Reference to the requested element.

Exceptions

(none)

Complexity

Constant - O(1).

Example

Main.cpp

#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

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