XtOffset
Section: XT FUNCTIONS (3)
Updated: libXt 1.2.0
Page Index
NAME
XtOffset, XtOffsetOf, XtNumber - determine the byte offset or number of array elements
SYNTAX
#include <
X11/Intrinsic.h>
-
- Cardinal XtOffset(Type pointer_type, Field field_name);
-
- Cardinal XtOffsetOf(Type structure_type, Field field_name);
-
- Cardinal XtNumber(ArrayVariable array);
ARGUMENTS
- array
-
Specifies a fixed-size array.
- field_name
-
Specifies the name of the field for which to calculate the byte offset.
- pointer_type
-
Specifies a type that is declared as a pointer to the structure.
- structure_type
-
Specifies a type that is declared as a structure.
DESCRIPTION
The
XtOffset
macro is usually used to determine the offset of various resource fields
from the beginning of a widget and can be used at compile time in static
initializations.
The
XtOffsetOf
macro expands to a constant expression that gives the offset in bytes
to the specified structure member from the beginning of the structure.
It is normally used to statically initialize resource lists and is more
portable than
XtOffset,
which serves the same function.
The
XtNumber
macro returns the number of elements in the specified argument lists,
resources lists, and other counted arrays.
SEE ALSO
XtGetResourceList(3),
XtSetArg(3)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface