08-22-2008
Purpose of empty Class
class A
{};
int main()
{
A a;
}
What is the purpose of such empty classes in C++?Why is it allowed in the language specification?
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Object(library call) Object(library call)
NAME
Object -- The Object widget class
SYNOPSIS
#include <Xm/Xm.h>
DESCRIPTION
Object is never instantiated. Its sole purpose is as a supporting superclass for other widget classes.
Classes
The class pointer is objectClass.
The class name is Object.
New Resources
The following table defines a set of widget resources used by the programmer to specify data. The programmer can also set the resource val-
ues for the inherited classes to set attributes for this widget. To reference a resource by name or by class in a .Xdefaults file, remove
the XmN or XmC prefix and use the remaining letters. To specify one of the defined values for a resource in a .Xdefaults file, remove the
Xm prefix and use the remaining letters (in either lowercase or uppercase, but include any underscores between words). The codes in the
access column indicate if the given resource can be set at creation time (C), set by using XtSetValues (S), retrieved by using XtGetValues
(G), or is not applicable (N/A).
+---------------------------------------------------------------------+
| | Object Resource Set | | |
|Name | Class | Type | Default | Access |
+-------------------+-------------+----------------+---------+--------+
|XmNdestroyCallback | XmCCallback | XtCallbackList | NULL | C |
+-------------------+-------------+----------------+---------+--------+
+-------------------+-------------+----------------+---------+--------+
XmNdestroyCallback
Specifies a list of callbacks that is called when the gadget is destroyed.
Translations
There are no translation for Object.
Object(library call)