Finally, we will also add a constructor that takes an initializer list, as follows:

    container(
        std::initializer_list<T> init,
        const Allocator &alloc = Allocator()
    ) :
        m_v(init, alloc)
    {
        std::sort(m_v.begin(), m_v.end(), compare_type());
        std::cout << "8
";
    }

As shown in the preceding code, the initializer list could provide the initial elements for the std::vector in any order. As a result, we must sort the list after the vector is initialized.