_param1</span><span class="special">)...</span></code> declares the template parameters of the
        actual specialization of <code class="computeroutput"><span class="identifier">type_name</span></code>
        that is adapted as a fusion sequence. The sequence of <code class="literal">([attribute_type<span class="emphasis"><em>N</em></span>,
        attribute_const_type<span class="emphasis"><em>N</em></span>,</code> get_expr<span class="emphasis"><em>N</em></span>,
        set_expr<span class="emphasis