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X11R7.4 - man page for xtoffsetof (x11r4 section 3)

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XtOffset(3)				   XT FUNCTIONS 			      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 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(3Xt), XtSetArg(3Xt)
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11				   libXt 1.0.5				      XtOffset(3)
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