namespace boost
{
    typedef crc_optimal<16, 0x8005, 0, 0, true, true>
      crc_16_type;

    typedef crc_optimal<16, 0x1021, 0xFFFF, 0, false, false>
      crc_ccitt_false_t, crc_ccitt_type;
    typedef crc_optimal<16, 0x1021, 0, 0, true, true>  crc_ccitt_true_t;

    typedef crc_optimal<16, 0x8408, 0, 0, true, true>    crc_xmodem_type;
    typedef crc_optimal<16, 0x1021, 0, 0, false, false>  crc_xmodem_t;

    typedef crc_optimal<32, 0x04C11DB7, 0xFFFFFFFF, 0xFFFFFFFF, true, true>
      crc_32_type;
}

Several sample CRC types are given, representing common CRC algorithms. The samples have now been checked against the Catalogue of parametrised CRC algorithms, leading to some new type-aliases corresponding to the corrected profiles. (Older, incorrect profiles keep their name for backwards compatibility.) However, this library is primarily concerned with CRC implementation, and not with determining "good" sets of CRC parameters.