NAME
XtOffset, XtOffsetOf, XtNumber - determine the byte offset or number of array
elements
SYNTAX
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