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XtOffset, XtOffsetOf, XtNumber - determine
the byte offset or number of array elements
- Cardinal XtOffset(Type
pointer_type, Field field_name);
- Cardinal XtOffsetOf(Type structure_type,
Field field_name);
- Cardinal XtNumber(ArrayVariable array);
- 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.
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.
XtGetResourceList(3Xt)
, XtSetArg(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
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