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sizeof of struct with bit Field

Dovalle Yankelovich

please explain me why the sizeof (C51) returns 6 bytes for this struct instead of 5:

typedef struct DEKO_COMM_HEADER
{ UINT16 m_uiMsgOpcode;
UCHAR8 m_sblMsgPriority :2;
UINT16 m_sblDataLength :11;
UINT16 m_sblMsgTimeStamp :11;
}DEKO_COMM_HEADER, *PDEKO_COMM_HEADER;

UINT16 is typedef for unsigned int
UCHAR8 is typedef for unsigned char

thanks

Parents
  • 0 in reply to Kalib Rahib

    why you not write code to see asssembler of compiler producing???
    you use SRC option box

    I would not do that. It may be that you are so bright that you never forget to remove the SRC statement, I am not. For that reason, "to see asssembler" I look at the .lst file which does not affect anything.

    Erik

Reply
  • 0 in reply to Kalib Rahib

    why you not write code to see asssembler of compiler producing???
    you use SRC option box

    I would not do that. It may be that you are so bright that you never forget to remove the SRC statement, I am not. For that reason, "to see asssembler" I look at the .lst file which does not affect anything.

    Erik

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