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XtOffset(3) Library Functions Manual XtOffset(3) 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 struc- ture. 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 com- pile 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 func- tion. The XtNumber macro returns the number of elements in the specified ar- gument lists, resources lists, and other counted arrays. SEE ALSO XtGetResourceList(3), XtSetArg(3) X Toolkit Intrinsics - C Language Interface Xlib - C Language X Interface XT FUNCTIONS X Version 11 XtOffset(3)