From c18d8fa9677dfde9501bd01f2dabd4827705973c Mon Sep 17 00:00:00 2001
From: Dave Abrahams <dave@boostpro.com>
Date: Tue, 12 Mar 2002 21:14:03 +0000
Subject: [PATCH] added first virtual function tests

[SVN r13183]
---
 test/virtual_functions.cpp | 118 +++++++++++++++++++++++++++++++++++++
 test/virtual_functions.py  | 100 +++++++++++++++++++++++++++++++
 2 files changed, 218 insertions(+)
 create mode 100644 test/virtual_functions.cpp
 create mode 100644 test/virtual_functions.py

diff --git a/test/virtual_functions.cpp b/test/virtual_functions.cpp
new file mode 100644
index 00000000..ab05fe3c
--- /dev/null
+++ b/test/virtual_functions.cpp
@@ -0,0 +1,118 @@
+// Copyright David Abrahams 2002. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+#include <boost/python/class.hpp>
+#include <boost/python/module.hpp>
+#include <boost/python/returning.hpp>
+#include <boost/ref.hpp>
+
+using namespace boost::python;
+
+struct X
+{
+    explicit X(int x) : x(x), magic(7654321) { ++counter; }
+    X(X const& rhs) : x(rhs.x), magic(7654321) { ++counter; }
+    virtual ~X() { assert(magic == 7654321); magic = 6666666; x = 9999; --counter; }
+
+    void set(int x) { assert(magic == 7654321); this->x = x; }
+    int value() const { assert(magic == 7654321); return x; }
+    static int count() { return counter; }
+ private:
+    void operator=(X const&);
+ private:
+    int x;
+    long magic;
+    static int counter;
+};
+
+struct Y : X
+{
+    Y(int x) : X(x) {};
+};
+
+struct abstract : X
+{
+    abstract(int x) : X(x) {};
+    int call_f(Y const& y) { return f(y); }
+    virtual int f(Y const& y) = 0;
+};
+
+struct concrete : X
+{
+    concrete(int x) : X(x) {};
+    int call_f(Y const& y) { return f(y); }
+    virtual int f(Y const& y) { set(y.value()); return y.value(); }
+};
+
+struct abstract_callback : abstract
+{
+    abstract_callback(PyObject* p, int x)
+        : abstract(x), self(p)
+    {}
+
+    int f(Y const& y)
+    {
+        return returning<int>::call_method(self, "f", boost::ref(y));
+    }
+
+    PyObject* self;
+};
+
+struct concrete_callback : concrete
+{
+    concrete_callback(PyObject* p, int x)
+        : concrete(x), self(p)
+    {}
+
+    int f(Y const& y)
+    {
+        return returning<int>::call_method(self, "f", boost::ref(y));
+    }
+
+    int f_impl(Y const& y)
+    {
+        return this->concrete::f(y);
+    }
+    
+    PyObject* self;
+};
+
+int X::counter;
+
+BOOST_PYTHON_MODULE_INIT(virtual_functions_ext)
+{
+    module("virtual_functions_ext")
+        .add(
+            class_<concrete, bases<>, objects::value_holder_generator<concrete_callback> >("concrete")
+            .def_init(args<int>())
+            .def("value", &concrete::value)
+            .def("set", &concrete::set)
+            .def("call_f", &concrete::call_f)
+            .def("f", &concrete_callback::f_impl))
+        
+#if 0
+        .add(
+            class_<abstract, bases<>
+            , objects::pointer_holder_generator<
+                boost::python::objects::shared_ptr_generator
+                , abstract_callback>
+            >("abstract")
+            
+            .def_init(args<int>())
+            .def("value", &abstract::value)
+            .def("call_f", &abstract::call_f)
+            .def("set", &abstract::set))
+#endif 
+        
+        .add(
+            class_<Y>("Y")
+            .def_init(args<int>())
+            .def("value", &Y::value)
+            .def("set", &Y::set)
+            )
+        ;
+}
+
+#include "module_tail.cpp"
diff --git a/test/virtual_functions.py b/test/virtual_functions.py
new file mode 100644
index 00000000..8ea992c5
--- /dev/null
+++ b/test/virtual_functions.py
@@ -0,0 +1,100 @@
+'''
+>>> from virtual_functions_ext import *
+
+>>> class C1(concrete):
+...     def f(self, y):
+...         return concrete.f(self, Y(-y.value()))
+
+>>> class C2(concrete):
+...     pass
+
+<<<>>> class A1(abstract):
+<<<...     def f(self, y):
+<<<...         return abstract.f(self, Y(-y.value()))
+<<<
+<<<>>> class A2(abstract):
+<<<...     pass
+<<<
+
+>>> y1 = Y(16)
+>>> y2 = Y(17)
+
+
+
+#
+# Test abstract with f overridden
+#
+<<<>>> a1 = A1(42)
+<<<>>> a1.value()
+<<<42
+<<<
+<<<# Call f indirectly from C++
+<<<>>> a1.call_f(y1)
+<<<-16
+<<<
+<<<# Call f directly from Python
+<<<>>> a1.f(y2)
+<<<-17
+<<<
+<<<#
+<<<# Test abstract with f not overridden
+<<<#
+<<<>>> a2 = A2(42)
+<<<>>> A2.value()
+<<<42
+<<<
+<<<# Call f indirectly from C++
+<<<>>> c1.call_f(y1)
+<<<16
+<<<
+<<<# Call f directly from Python
+<<<>>> c1.f(y2)
+<<<17
+<<<
+############# Concrete Tests ############
+
+#
+# Test concrete with f overridden
+#
+>>> c1 = C1(42)
+>>> c1.value()
+42
+
+# Call f indirectly from C++
+>>> c1.call_f(y1)
+-16
+
+# Call f directly from Python
+>>> c1.f(y2)
+-17
+
+#
+# Test concrete with f not overridden
+#
+>>> c2 = C2(42)
+>>> c2.value()
+42
+
+# Call f indirectly from C++
+>>> c2.call_f(y1)
+16
+
+# Call f directly from Python
+>>> c2.f(y2)
+17
+
+
+'''
+
+def run(args = None):
+    import sys
+    import doctest
+
+    if args is not None:
+        sys.argv = args
+    return doctest.testmod(sys.modules.get(__name__))
+    
+if __name__ == '__main__':
+    print "running..."
+    import sys
+    sys.exit(run()[0])