The next two constructors allow the user of the API to set the minimum size of the vector as follows:

    container(
        size_type count,
        const T &value,
        const Allocator &alloc = Allocator()
    ) :
        m_v(count, value, alloc)
    {
        std::cout << "3
";
    }

    explicit container(
        size_type count,
        const Allocator &alloc = Allocator()
    ) :
        m_v(count, alloc)
    {
        std::cout << "4
";
    }

The first constructor will create the vector of count elements, all initialized with a value of value, while the second creates the elements with their default values (for example, a vector of integers would be initialized to zero).