XtOffset(3Xt) X Version 11 (Release 6.6) XtOffset(3Xt)
NAME
XtOffset, XtOffsetOf, XtNumber - determine the byte offset
or number of array elements
SYNTAX
Cardinal XtOffset(pointer_type, field_name)
Type pointer_type;
Field field_name;
Cardinal XtOffsetOf(structure_type, field_name)
Type structure_type;
Field field_name;
Cardinal XtNumber(array)
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
rom 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(3Xt), XtSetArg(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
Page 1 (printed 7/20/06)
