[#9BA3F0699169A2ABEFE19925B9BE45C03E2430D5]

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        <h2><a href="#">param</a>::
has_value</h2>
        <p><span>True if a value is present</span></p>


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        <h3>Synopsis</h3>
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            <code>
                            </code>
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        <pre class="source-code cpp">
            bool has_value = false;
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        <h3>Description</h3>
        <p><span>The presence of a value is indicated by</span> <span>`has_value == true`.</span>
<span>An empty value is distinct from no value.</span></p>


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