Function lead_code_unit

include/boost/parser/detail/text/transcode_iterator.hpp:188–191

Returns true iff `c` is a UTF-8 lead code unit (which must be followed by 1-3 following units). */

    /** Returns true iff `c` is a UTF-8 lead code unit (which must be followed
        by 1-3 following units). */
    constexpr bool lead_code_unit(char8_type c)
    {
        return uint8_t((unsigned char)c - 0xc2) <= 0x32;
    }

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