NAME

       VistaIOOffset, VistaIOOffsetOf - determine the byte offset of a structure field

SYNTAX

       #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 offset.

       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.

DESCRIPTION

       The  VistaIOOffset  and  VistaIOOffsetOf macros return the byte offset of the field_name field within its
       structure.

SEE ALSO

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.