constexpr const_reference at(size_type index) const;
constexpr reference at(size_type index);

Returns the number a reference to the element at the index specified. If the index is not within the range [0, size()), an exception of type std::out_of_range is thrown.

Reference to the requested element.

std::out_of_range if index >= size().

Constant.

#include <haz/SharedQueue.hpp>
#include <iostream>

int main() {
    haz::SharedQueue<int, 10> queue{ 0, 1, 2 };
    std::cout << "The second element is " << queue.at(1) << '\n';
}

Output:

The second element is 1