[#F615CB5B9E5A374E5C2512794FCB7673B457EF5E]

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        <h2>Function <a href="#">lut_chars</a>::
operator()</h2>
        <p><span>Return true if ch is in the character set.</span></p>


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        <h3>Synopsis</h3>
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            <code>
                            </code>
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        <pre class="source-code cpp">
            constexpr
bool
operator()(char ch) const noexcept;
        </pre>
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        <h3>Description</h3>
        <p><span>This function returns true if the</span> <span>character `ch` is in the set, otherwise</span>
<span>it returns false.</span></p>

<h3>Complexity</h3>
<p><span>Constant.</span></p>

<h3>Exception Safety</h3>
<p><span>Throws nothing.</span></p>


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