[#48C6CB256C6192408CA76B0F901A5699D9E83462]

<div id="48C6CB256C6192408CA76B0F901A5699D9E83462">
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        <h2>Class param_pct_view</h2>
        <p><span>A query parameter</span></p>


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        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
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        <pre class="source-code cpp">
            struct param_pct_view;
        </pre>
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            <div>
                <h3> Member Functions</h3>
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                <h3> Data Members</h3>
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        <h3>Description</h3>
        <p><span>Objects of this type represent a single key</span> <span>and value pair in a query string where a key</span>
<span>is always present and may be empty, while the</span>
<span>presence of a value is indicated by</span>
<span>has_value</span>
<span>equal to true.</span>
<span>An empty value is distinct from no value.</span></p>

<p><span>The strings may have percent escapes, and</span>
<span>offer an additional invariant: they never</span>
<span>contain an invalid percent-encoding.</span></p>

<p><span>For most usages, key comparisons are</span>
<span>case-sensitive and duplicate keys in</span>
<span>a query are possible. However, it is</span>
<span>the authority that has final control</span>
<span>over how the query is interpreted.</span></p>

<p><span></span></p>

<p><span>Keys and values in this object reference</span>
<span>external character buffers.</span>
<span>Ownership of the buffers is not transferred;</span>
<span>the caller is responsible for ensuring that</span>
<span>the assigned buffers remain valid until</span>
<span>they are no longer referenced.</span></p>

<h3>BNF</h3>
<code>
query-params    = query-param *( "&" query-param )
query-param     = key [ "=" value ]
key             = *qpchar
value           = *( qpchar / "=" )
</code>
<h3>Specification</h3>
<li><a href="https://en.wikipedia.org/wiki/Query_string">Query string (Wikipedia)</a></li>

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