std::array operator[]

since C++17

// Non const version
constexpr reference at( size_type pos );

// Const version
constexpr const_reference at( size_type pos ) const;

since C++14

// Non const version
reference at( size_type pos );

// Const version
constexpr const_reference at( size_type pos ) const;

until C++14

// Non const version
reference at( size_type pos );

// Const version
const_reference at( size_type pos ) const;

Returns a reference

to the character at specified index pos. No bounds checking is performed.

Parameters

• pos - position of the character to return

Return value

Reference to the requested character.

Exceptions

None.

Complexity

Constant.

Example

Main.cpp

#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