[#8B0487D9FBD591BF3D4E4663ECA58B192C9CE2C0]

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        <h2>Function <a href="#">url_view_base</a>::
has_scheme</h2>
        <p><span>Return true a scheme is present</span></p>


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        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
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        <pre class="source-code cpp">
            bool
has_scheme() const noexcept;
        </pre>
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        <h3>Description</h3>
        <p><span>This function returns true if this</span> <span>contains a scheme.</span></p>

<h3>Example</h3>
<code>
assert( url_view( "http://www.example.com" ).has_scheme() );
</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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