Function continuation

include/boost/parser/detail/text/transcode_iterator.hpp:194–194

Returns true iff `c` is a UTF-8 continuation code unit. */

    /** Returns true iff `c` is a UTF-8 continuation code unit. */
    constexpr bool continuation(char8_type c) { return (int8_t)c < -0x40; }

    /** Given the first (and possibly only) code unit of a UTF-8-encoded code
        point, returns the number of bytes occupied by that code point (in the