6 files changed, 197 insertions, 0 deletions
diff --git a/Examples/python/extend/Makefile b/Examples/python/extend/Makefile
new file mode 100644
index 0000000..a29276e
--- /dev/null
+++ b/Examples/python/extend/Makefile
@@ -0,0 +1,22 @@
+TOP        = ../..
+SWIG       = $(TOP)/../preinst-swig
+CXXSRCS    = example.cxx
+TARGET     = example
+INTERFACE  = example.i
+LIBS       = -lm
+SWIGOPT    = 
+
+all::
+	$(MAKE) -f $(TOP)/Makefile $(SWIGLIB) CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' python_cpp
+
+static::
+	$(MAKE) -f $(TOP)/Makefile $(SWIGLIB) CXXSRCS='$(CXXSRCS)' SWIG='$(SWIG)' \
+	SWIGOPT='$(SWIGOPT)' TARGET='mypython' INTERFACE='$(INTERFACE)' python_cpp_static
+
+clean::
+	$(MAKE) -f $(TOP)/Makefile python_clean
+	rm -f $(TARGET).py
+
+check: all
+	$(MAKE) -f $(TOP)/Makefile python_run
diff --git a/Examples/python/extend/example.cxx b/Examples/python/extend/example.cxx
new file mode 100644
index 0000000..450d756
--- /dev/null
+++ b/Examples/python/extend/example.cxx
@@ -0,0 +1,4 @@
+/* File : example.cxx */
+
+#include "example.h"
+
diff --git a/Examples/python/extend/example.h b/Examples/python/extend/example.h
new file mode 100644
index 0000000..b27ab97
--- /dev/null
+++ b/Examples/python/extend/example.h
@@ -0,0 +1,56 @@
+/* File : example.h */
+
+#include <cstdio>
+#include <iostream>
+#include <vector>
+#include <string>
+#include <cmath>
+
+class Employee {
+private:
+	std::string name;
+public:
+	Employee(const char* n): name(n) {}
+	virtual std::string getTitle() { return getPosition() + " " + getName(); }
+	virtual std::string getName() { return name; }
+	virtual std::string getPosition() const { return "Employee"; }
+	virtual ~Employee() { printf("~Employee() @ %p\n", this); }
+};
+
+
+class Manager: public Employee {
+public:
+	Manager(const char* n): Employee(n) {}
+	virtual std::string getPosition() const { return "Manager"; }
+};
+
+
+class EmployeeList {
+	std::vector<Employee*> list;
+public:
+	EmployeeList() {
+		list.push_back(new Employee("Bob"));
+		list.push_back(new Employee("Jane"));
+		list.push_back(new Manager("Ted"));
+	}
+	void addEmployee(Employee *p) {
+		list.push_back(p);
+		std::cout << "New employee added.   Current employees are:" << std::endl;
+		std::vector<Employee*>::iterator i;
+		for (i=list.begin(); i!=list.end(); i++) {
+			std::cout << "  " << (*i)->getTitle() << std::endl;
+		}
+	}
+	const Employee *get_item(int i) {
+		return list[i];
+	}
+	~EmployeeList() { 
+		std::vector<Employee*>::iterator i;
+		std::cout << "~EmployeeList, deleting " << list.size() << " employees." << std::endl;
+		for (i=list.begin(); i!=list.end(); i++) {
+			delete *i;
+		}
+		std::cout << "~EmployeeList empty." << std::endl;
+	}
+};
+
diff --git a/Examples/python/extend/example.i b/Examples/python/extend/example.i
new file mode 100644
index 0000000..c8ec32e
--- /dev/null
+++ b/Examples/python/extend/example.i
@@ -0,0 +1,15 @@
+/* File : example.i */
+%module(directors="1") example
+%{
+#include "example.h"
+%}
+
+%include "std_vector.i"
+%include "std_string.i"
+
+/* turn on director wrapping for Manager */
+%feature("director") Employee;
+%feature("director") Manager;
+
+%include "example.h"
+
diff --git a/Examples/python/extend/index.html b/Examples/python/extend/index.html
new file mode 100644
index 0000000..959e8c6
--- /dev/null
+++ b/Examples/python/extend/index.html
@@ -0,0 +1,19 @@
+<html>
+<head>
+<title>SWIG:Examples:python:extend</title>
+</head>
+
+<body bgcolor="#ffffff">
+
+
+<tt>SWIG/Examples/python/extend/</tt>
+<hr>
+
+<H2>Extending a simple C++ class in Python</H2>
+
+<p>
+This example illustrates the extending of a C++ class with cross language polymorphism.
+
+<hr>
+</body>
+</html>
diff --git a/Examples/python/extend/runme.py b/Examples/python/extend/runme.py
new file mode 100644
index 0000000..240b098
--- /dev/null
+++ b/Examples/python/extend/runme.py
@@ -0,0 +1,81 @@
+# file: runme.py
+
+# This file illustrates the cross language polymorphism using directors.
+
+import example 
+
+
+# CEO class, which overrides Employee::getPosition().
+
+class CEO(example.Manager):
+	def __init__(self, name):
+		example.Manager.__init__(self, name)
+	def getPosition(self):
+		return "CEO"
+
+
+# Create an instance of our employee extension class, CEO. The calls to
+# getName() and getPosition() are standard, the call to getTitle() uses
+# the director wrappers to call CEO.getPosition. e = CEO("Alice")
+
+e = CEO("Alice")
+print e.getName(), "is a", e.getPosition()
+print "Just call her \"%s\"" % e.getTitle()
+print "----------------------"
+
+
+# Create a new EmployeeList instance.  This class does not have a C++
+# director wrapper, but can be used freely with other classes that do.
+
+list = example.EmployeeList()
+
+# EmployeeList owns its items, so we must surrender ownership of objects
+# we add. This involves first calling the __disown__ method to tell the
+# C++ director to start reference counting. We reassign the resulting
+# weakref.proxy to e so that no hard references remain. This can also be
+# done when the object is constructed, as in: e =
+# CEO("Alice").__disown__()
+
+e = e.__disown__()
+list.addEmployee(e)
+print "----------------------"
+
+# Now we access the first four items in list (three are C++ objects that
+# EmployeeList's constructor adds, the last is our CEO). The virtual
+# methods of all these instances are treated the same. For items 0, 1, and
+# 2, both all methods resolve in C++. For item 3, our CEO, getTitle calls
+# getPosition which resolves in Python. The call to getPosition is
+# slightly different, however, from the e.getPosition() call above, since
+# now the object reference has been "laundered" by passing through
+# EmployeeList as an Employee*. Previously, Python resolved the call
+# immediately in CEO, but now Python thinks the object is an instance of
+# class Employee (actually EmployeePtr). So the call passes through the
+# Employee proxy class and on to the C wrappers and C++ director,
+# eventually ending up back at the CEO implementation of getPosition().
+# The call to getTitle() for item 3 runs the C++ Employee::getTitle()
+# method, which in turn calls getPosition(). This virtual method call
+# passes down through the C++ director class to the Python implementation
+# in CEO. All this routing takes place transparently.
+
+print "(position, title) for items 0-3:"
+
+print "  %s, \"%s\"" % (list.get_item(0).getPosition(), list.get_item(0).getTitle())
+print "  %s, \"%s\"" % (list.get_item(1).getPosition(), list.get_item(1).getTitle())
+print "  %s, \"%s\"" % (list.get_item(2).getPosition(), list.get_item(2).getTitle())
+print "  %s, \"%s\"" % (list.get_item(3).getPosition(), list.get_item(3).getTitle())
+print "----------------------"
+
+# Time to delete the EmployeeList, which will delete all the Employee*
+# items it contains. The last item is our CEO, which gets destroyed as its
+# reference count goes to zero. The Python destructor runs, and is still
+# able to call self.getName() since the underlying C++ object still
+# exists. After this destructor runs the remaining C++ destructors run as
+# usual to destroy the object.
+
+del list
+print "----------------------"
+
+# All done.
+
+print "python exit"
+