two director examples for python

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@4447 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/python/callback/runme.py

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+# file: runme.py
+
+# This file illustrates the cross language polymorphism using directors.
+
+import example 
+
+
+# CEO class, which overrides Employee::getPosition().
+
+class PyCallback(example.Callback):
+	def __init__(self):
+		example.Callback.__init__(self)
+	def run(self):
+		print "PyCallback.run()"
+	def __del__(self):
+		print "PyCallback.__del__()"
+		# for shadow class extensions that are not "disowned" and
+		# define a __del__ method, it is very important to call the 
+		# base class __del__.  otherwise the c++ objects will never
+		# be deleted.
+		example.Callback.__del__(self)
+
+
+# Create an Caller instance
+
+caller = example.Caller()
+
+# Add a simple C++ callback (caller owns the callback, so
+# we disown it first by clearing the .thisown flag).
+
+print "Adding and calling a normal C++ callback"
+print "----------------------------------------"
+
+callback = example.Callback()
+callback.thisown = 0
+caller.setCallback(callback)
+caller.call()
+caller.delCallback();
+
+print
+print "Adding and calling a Python callback"
+print "------------------------------------"
+
+# Add a Python callback (caller owns the callback, so we
+# disown it first by calling __disown__).
+
+caller.setCallback(PyCallback().__disown__())
+caller.call()
+caller.delCallback()
+
+print
+print "Adding and calling another Python callback"
+print "------------------------------------------"
+
+# Lets do the same but use the weak reference this time.
+
+callback = PyCallback().__disown__()
+caller.setCallback(callback)
+caller.call()
+caller.delCallback()
+
+# All done.
+
+print
+print "python exit"
+