VistaIOOffset3
Determine the byte offset of a structure field
Usage
#include <vistaio.h>
size_t VistaIOOffset (pointer_type, field_name)
Type pointer_type; Field field_name;
size_t VistaIOOffsetOf (struct_type, field_name)
Type struct_type; Field field_name;
Arguments
field_name
|
Specifies the name of a structure field for which to calculate the byte |
|---|---|
pointer_type
|
Specifies a type that is declared as a pointer to a structure. |
struct_type
|
Specifies a type that is declared as a structure. |
Overview
The VistaIOOffset and VistaIOOffsetOf macros return the byte offset of the field_name field within its structure.
Notes
These are equivalent to the X Toolkit macros XtOffset(3Xt) and XtOffsetOf(3Xt). ANSI C defines an offsetof macro, which is to be preferred over any of these.
Releases
Unchanged in 6 releases since Debian 8 (Jessie).