[#A0BE2BA4D8B46A3F37BCC211D3206DAC11943563]

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        <h2>Function <a href="#">hexdig_chars_t</a>::
operator()</h2>
        <p><span>Return true if c 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 c) const noexcept;
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