[#CA3B12F07F972E911529AC55DCD0162DB49E2849]

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        <h2>Class is_charset</h2>
        
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        <h3>Synopsis</h3>
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            <code>
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        <pre class="source-code cpp">
            template<class T>
struct is_charset<T, void_t<decltype(std::declval<bool&>() =
                std::declval<T const&>().operator()(
                    std::declval<char>()))>>
    : std::true_type;
        </pre>
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