[#CAD809F6272B6BFE2F49A0FBC89639922E01ACD6]

<div id="CAD809F6272B6BFE2F49A0FBC89639922E01ACD6">
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        <h2>Function <a href="#">params_encoded_base</a>::
contains</h2>
        <p><span>Return true if a matching key exists</span></p>


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        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            bool
contains(
    pct_string_view key,
    ignore_case_param ic = = {}) const noexcept;
        </pre>
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        <h3>Description</h3>
        <p><span>This function examines the parameters</span> <span>in the container to find a match for</span>
<span>the specified key,</span>
<span>which may contain percent escapes.</span>
<span>The comparison is performed as if all</span>
<span>escaped characters were decoded first.</span></p>

<h3>Example</h3>
<code>
assert( url_view( "?first=John&last=Doe" ).encoded_params().contains( "first" ) );
</code>
<h3>Complexity</h3>
<p><span>Linear in `this->buffer().size()`.</span></p>

<h3>Exception Safety</h3>
<p><span>Exceptions thrown on invalid input.</span></p>


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