Method max_size

include/circular/circular.h:336–339

        size_type capacity() const    { return array_size_; }
        bool      empty() const       { return !contents_size_; }
        size_type max_size() const
        {
            return alloc_.max_size();
        }
        void reserve(size_type new_size)
        {
            if (capacity() < new_size)