XtIsComposite man page on Ultrix

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XtClass(3Xt)			     X11R5			  XtClass(3Xt)

NAME
       XtClass, XtSuperclass, XtIsSubclass, XtCheckSubclass, XtIsComposite,
       XtIsManaged - obtain and verify a widget's class

SYNTAX
       WidgetClass XtClass(w)
	     Widget w;

       WidgetClass XtSuperclass(w)
	     Widget w;

       Boolean XtIsSubclass(w, widget_class)
	     Widget w;
	     WidgetClass widget_class;

       void XtCheckSubclass(w, widget_class, message)
	     Widget w;
	     WidgetClass widget_class;
	     String message;

       Boolean XtIsComposite(w)
	     Widget w;

       Boolean XtIsManaged(w)
	      Widget w;

ARGUMENTS
       w	 Specifies the widget.

       widget_class
		 Specifies the widget class.

       message	 Specifies the message that is to be used.

DESCRIPTION
       The function returns a pointer to the widget's class structure.

       The function returns a pointer to the widget's superclass class struc‐
       ture.

       The function returns if the class of the specified widget is equal to
       or is a subclass of the specified widget class.	The specified widget
       can be any number of subclasses down the chain and need not be an imme‐
       diate subclass of the specified widget class.  Composite widgets that
       need to restrict the class of the items they contain can use to find
       out if a widget belongs to the desired class of objects.

       The macro determines if the class of the specified widget is equal to
       or is a subclass of the specified widget class.	The widget can be any
       number of subclasses down the chain and need not be an immediate sub‐
       class of the specified widget class.  If the specified widget is not a
       subclass, constructs an error message from the supplied message, the
       widget's actual class, and the expected class and calls should be used
       at the entry point of exported routines to ensure that the client has
       passed in a valid widget class for the exported operation.

       is only executed when the widget has been compiled with the compiler
       symbol DEBUG defined; otherwise, it is defined as the empty string and
       generates no code.

       The function is a convenience function that is equivalent to with spec‐
       ified.

       The macro (for widget programmers) or function (for application pro‐
       grammers) returns if the specified child widget is managed or if it is
       not.

SEE ALSO
       XtAppErrorMsg(3Xt), XtDisplay(3Xt)
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

								  XtClass(3Xt)
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