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diff --git a/tests/cxx/tree/polymorphism/comparison/driver.cxx b/tests/cxx/tree/polymorphism/comparison/driver.cxx
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+// file : tests/cxx/tree/polymorphism/comparison/driver.cxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2006-2009 Code Synthesis Tools CC
+// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+// Test comparison of polymorphic object models.
+//
+
+#include <memory> // std::auto_ptr
+#include <iostream>
+
+#include "test.hxx"
+
+using namespace std;
+using namespace test;
+
+int
+main (int argc, char* argv[])
+{
+ if (argc != 2)
+ {
+ cerr << "usage: " << argv[0] << " test.xml" << endl;
+ return 1;
+ }
+
+ try
+ {
+ auto_ptr<type> r (root (argv[1]));
+
+ // Equals.
+ //
+ {
+ derived1 d ("a", 1);
+ d.b ("b");
+ type r1 (d);
+
+ assert (*r == r1);
+ }
+
+ // Values are not equal.
+ //
+ {
+ derived1 d ("a", 1);
+ d.b ("c");
+ type r1 (d);
+
+ assert (*r != r1);
+ }
+
+ // Values are not equal.
+ //
+ {
+ derived1 d ("a", 2);
+ d.b ("b");
+ type r1 (d);
+
+ assert (*r != r1);
+ }
+
+ // Different types.
+ //
+ {
+ derived2 d ("a", 1);
+ d.c ().push_back ("c");
+ type r1 (d);
+
+ assert (*r != r1);
+ }
+ }
+ catch (xml_schema::exception const& e)
+ {
+ cerr << e << endl;
+ return 1;
+ }
+}