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std::array<T,N>::at

From cppreference.com
< cpp‎ | container‎ | array
reference at( size_type pos );
(until C++17)
constexpr reference at( size_type pos );
(since C++17)
const_reference at( size_type pos ) const;
(until C++14)
constexpr const_reference at( size_type pos ) const;
(since C++14)

Returns a reference to the element at specified location pos, with bounds checking.

If pos is not within the range of the container, an exception of type std::out_of_range is thrown.

Contents

[edit] Parameters

pos - position of the element to return

[edit] Return value

Reference to the requested element.

[edit] Exceptions

std::out_of_range if !(pos < size()).

[edit] Complexity

Constant.

[edit] Example

#include <iostream>
#include <array>
 
int main()
{
    std::array<int,6> data = { 1, 2, 4, 5, 5, 6 };
 
    // Set element 1
    data.at(1) = 88;
 
    // Read element 2
    std::cout << "Element at index 2 has value " << data.at(2) << '\n';
 
    std::cout << "data size = " << data.size() << '\n';
 
    try {
        // Set element 6
        data.at(6) = 666;
    } catch (std::out_of_range const& exc) {
        std::cout << exc.what() << '\n';
    }
 
    // Print final values
    std::cout << "data:";
    for (int elem : data)
        std::cout << " " << elem;
    std::cout << '\n';
}

Possible output:

Element at index 2 has value 4
data size = 6
array::at: __n (which is 6) >= _Nm (which is 6)
data: 1 88 4 5 5 6

[edit] See also

access specified element
(public member function) [edit]