[#BED959FB6CAC4EB5B34037C1E546F6C1A12C10A3]

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        <h2>Class is_token</h2>
        
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        <h3>Synopsis</h3>
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        <pre class="source-code cpp">
            template<class T>
struct is_token<T, void_t<decltype(std::declval<T&>().prepare(
                std::declval<std::size_t>())), decltype(std::declval<T&>().result())>>
    : std::integral_constant<bool, std::is_convertible<decltype(std::declval<T &>().result()), typename T::result_type>::value && std::is_same<decltype(std::declval<T &>().prepare(0)), char *>::value && std::is_base_of<arg, T>::value && std::is_convertible<const volatile T *, const volatile arg *>::value>;
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