constexpr bool empty() const noexcept;

Checks whether the container has no elements.

(none)

true if the element is empty, otherwise false.

Constant.

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

int main() {
    haz::SharedQueue<int, 10> empty_queue;
    haz::SharedQueue<int, 10> not_empty_queue{ 0, 1, 2 };
    std::cout << "empty_queue is empty ? " << empty_queue.empty() << '\n';
    std::cout << "not_empty_queue is empty ? " << not_empty_queue.empty() << '\n';
}

Output:

empty_queue is empty ? 1
not_empty_queue is empty ? 0