[#413AFD68344C490515F3A7E5A11F6B9CAEBA0F54]

<div id="413AFD68344C490515F3A7E5A11F6B9CAEBA0F54">
    <div>
        <h2>Function <a href="#">params_view</a>::
params_view</h2>
        <p><span>Constructor</span></p>


    </div>

    <div>
        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            params_view(
    core::string_view s,
    encoding_opts opt);
        </pre>
    </div>

    <div>
        <h3>Description</h3>
        <p><span>This function constructs params from</span> <span>a valid query parameter string, which</span>
<span>can contain percent escapes.</span></p>

<p><span>This instance will use the specified</span>
<span>encoding_opts</span>
<span>when the values</span>
<span>are decoded.</span></p>

<p><span>Unlike the parameters in URLs, the string</span>
<span>passed here should not start with "?".</span>
<span>Upon construction, the view will</span>
<span>reference the character buffer pointed</span>
<span>to by `s`. The caller is responsible</span>
<span>for ensuring that the lifetime of the</span>
<span>buffer extends until it is no longer</span>
<span>referenced.</span></p>

<h3>Example</h3>
<code>
encoding_opts opt;
opt.space_as_plus = true;
params_view qp( "name=John+Doe", opt );
</code>
<h3>Effects</h3>
<code>
return params_view(parse_query( s ).value(), opt);
</code>
<h3>Postconditions</h3>
<code>
this->buffer().data() == s.data()
</code>
<h3>Complexity</h3>
<p><span>Linear in `s`.</span></p>

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

<h3>BNF</h3>
<code>
query-params    = [ query-param ] *( "&" query-param )

query-param     = key [ "=" value ]
</code>
<h3>Specification</h3>
<li><a href="https://datatracker.ietf.org/doc/html/rfc3986#section-3.4">3.4.  Query</a></li>

    </div>



</div>