xtdisplay(3) [hpux man page]

XtDisplay()															       XtDisplay()

Name
  XtDisplay - return the X Display pointer for the specified widget.

Synopsis
  Display *XtDisplay(w)
	 Widget w;

Inputs
  w	    Specifies the widget; must be of class Core or any subclass thereof.

Returns
  The Display of the specified widget.

Description
  XtDisplay() returns the display pointer for the specified widget.

Usage
  XtDisplay() is implemented as a function when called from application code, but is replaced by a more efficient macro when called from wid-
  get code that includes the file <X11/IntrinsicP.h>.

  Use XtDisplayOfObject() to return the display of a widget or the nearest widget ancestor of a non-widget object.

See Also
  XtDisplayOfObject(1), XtScreen(1).

Xt - Object Information 													       XtDisplay()

XtClass(3Xt)							     MIT X11R4							      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 structure.

       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 immediate 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 subclass 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 specified.

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

See Also
       XtAppErrorMsg(3Xt), XtDisplay(3Xt)
       X Window System Toolkit: The Complete Programmer's Guide and Specification, Paul J. Asente and Ralph Swick
       X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

																      XtClass(3Xt)