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16-Bit Language Tools Libraries
offsetof
Description:
Include:
Prototype:
Gives the offset of a structure member from the beginning of the struc-
ture.
<stddef.h>
#define offsetof( T , mbr )
Arguments:
T
name of structure
mbr name of member in structure T
Return Value:
Remarks:
Example:
Returns the offset in bytes of the specified member ( mbr ) from the
beginning of the structure.
The macro offsetof is undefined for bitfields. An error message will
occur if bitfields are used.
#include <stddef.h> /* for offsetof */
#include <stdio.h> /* for printf */
struct info {
char item1[5];
int item2;
char item3;
float item4;
};
int main(void)
{
printf("Offset of item1
offsetof(struct
printf("Offset of item2
offsetof(struct
printf("Offset of item3
offsetof(struct
printf("Offset of item4
offsetof(struct
}
Output:
= %d\n",
info,item1));
= %d\n",
info,item2));
= %d\n",
info,item3));
= %d\n",
info,item4));
Offset
Offset
Offset
Offset
of
of
of
of
item1
item2
item3
item4
=
=
=
=
0
6
8
10
Explanation:
This program shows the offset in bytes of each structure member from
the start of the structure. Although item1 is only 5 bytes ( char
item1[5] ), padding is added so the address of item2 falls on an
even boundary. The same occurs with item3 ; it is 1 byte ( char
item3 ) with 1 byte of padding.
DS51456E-page 42
? 2008 Microchip Technology Inc.
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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