[#ACDEA9F7F68B0112FD4BD827D3693E33E8F6D6AF]

<div id="ACDEA9F7F68B0112FD4BD827D3693E33E8F6D6AF">
    <div>
        <h2>Function <a href="#">url_view_base</a>::
zone_id</h2>
        <p><span>Return the IPv6 Zone ID</span></p>


    </div>

    <div>
        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            template<class StringToken = string_token::return_string>
StringToken::result_type
zone_id(StringToken&& token) const;
        </pre>
    </div>

    <div>
        <h3>Description</h3>
        <p><span>If the host type is</span> <span>host_type::ipv6</span> <span>,        this function returns the Zone ID as</span>
<span>a string. Otherwise an empty string is returned.</span>
<span>Any percent-escapes in the string are</span>
<span>decoded first.</span></p>

<h3>Example</h3>
<code>
assert( url_view( "http://[fe80::1%25eth0]/" ).zone_id() == "eth0" );
</code>
<h3>Complexity</h3>
<p><span>Linear in `this->encoded_zone_id().size()`.</span></p>

<h3>Exception Safety</h3>
<p><span>Calls to allocate may throw.</span></p>

<h3>BNF</h3>
<code>
host        = IP-literal / IPv4address / reg-name

IP-literal = "[" ( IPv6address / IPv6addrz / IPvFuture  ) "]"

ZoneID = 1*( unreserved / pct-encoded )

IPv6addrz = IPv6address "%25" ZoneID
</code>
<h3>Specification</h3>
<li><a href="https://datatracker.ietf.org/doc/html/rfc6874">Representing IPv6 Zone Identifiers in Address Literals and Uniform Resource Identifiers</a></li>

    </div>



</div>