via a mechanism known as "parasitic inheritance".
Simply speaking this method "extends another class". What is actually
happening is that it creates an instance of class name
by taking another Object instance and add
...className to the class
list and also add all the named values in
... as fields to the
The method should be used by the constructor of a class and nowhere else.
The name of new class.
Named values representing the fields of the new instance.
An optional named
The reason for the strange name of argument
"...className" is that
if one tries to set a field with a name that is a prefix of the name of
this arguments and one at the same time does not specify the name of this
argument one would run into strange errors. For instance, try
extend(Object(), "MyClass", ...c=0).
Returns an Object of class
It is possible to specify modifiers to some of the fields. Currently it
is only the
cached modifier that is recognized. A field that is
cached will be assigned
*gc()) is called. To specify a modifier, append a comma
separated list of modifiers followed by a colon, e.g. "cached:foo".
For more information see
## Not run: For a complete example see help(Object).