[#B8CDFB5A906A7ADAB37C78E7B3733CFFE09CA045]

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        <h2>Function <a href="#">url_view_base</a>::
scheme_id</h2>
        <p><span>Return the scheme</span></p>


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        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            scheme
scheme_id() const noexcept;
        </pre>
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        <h3>Description</h3>
        <p><span>This function returns a value which</span> <span>depends on the scheme in the url:</span></p>

<li><span>If the scheme is a well-known</span>
<span>scheme, corresponding value from</span>
<span>the enumeration</span>
<span>urls::scheme</span>
<span>is returned.</span></li>
<li><span>If a scheme is present but is not</span>
<span>a well-known scheme, the value</span>
<span>returned is</span>
<span>urls::scheme::unknown</span>
<span>.</span></li>
<li><span>Otherwise, if the scheme is absent</span>
<span>the value returned is</span>
<span>urls::scheme::none</span>
<span>.</span></li>
<h3>Example</h3>
<code>
assert( url_view( "wss://www.example.com/crypto.cgi" ).scheme_id() == scheme::wss );
</code>
<h3>Complexity</h3>
<p><span>Constant.</span></p>

<h3>Exception Safety</h3>
<p><span>Throws nothing.</span></p>

<h3>BNF</h3>
<code>
URI             = scheme ":" hier-part [ "?" query ] [ "#" fragment ]

absolute-URI    = scheme ":" hier-part [ "?" query ]

scheme          = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
</code>
<h3>Specification</h3>
<li><a href="https://datatracker.ietf.org/doc/html/rfc3986#section-3.1">3.1. Scheme (rfc3986)</a></li>

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