[#BAC57C288C40243B978B4564FAB69440E9AE8E6A]

<div id="BAC57C288C40243B978B4564FAB69440E9AE8E6A">
    <div>
        <h2>Function <a href="#">param</a>::
param</h2>
        <p><span>Constructor</span></p>


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    <div>
        <h3>Synopsis</h3>
        <div>
            <code>
                            </code>
        </div>
        <pre class="source-code cpp">
            template<class OptionalString>
param(
    core::string_view key,
    OptionalString const& value);
        </pre>
    </div>

    <div>
        <h3>Description</h3>
        <p><span>This constructs a parameter with a key</span> <span>and value.</span></p>

<p><span>No validation is performed on the strings.</span>
<span>Ownership of the key and value is acquired</span>
<span>by making copies.</span></p>

<h3>Example</h3>
<code>
param qp( "key", "value" );
</code>
<code>
param qp( "key", optional<core::string_view>("value") );
</code>
<code>
param qp( "key", boost::none );
</code>
<code>
param qp( "key", nullptr );
</code>
<code>
param qp( "key", no_value );
</code>
<h3>Postconditions</h3>
<code>
this->key == key && this->value == value && this->has_value == true
</code>
<h3>Complexity</h3>
<p><span>Linear in `key.size() + value.size()`.</span></p>

<h3>Exception Safety</h3>
<p><span>Calls to allocate may throw.</span></p>


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