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diff --git a/libstdc++-v3/testsuite/ext/pb_ds/example/basic_set.cc b/libstdc++-v3/testsuite/ext/pb_ds/example/basic_set.cc
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+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+
+// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
+
+// Permission to use, copy, modify, sell, and distribute this software
+// is hereby granted without fee, provided that the above copyright
+// notice appears in all copies, and that both that copyright notice
+// and this permission notice appear in supporting documentation. None
+// of the above authors, nor IBM Haifa Research Laboratories, make any
+// representation about the suitability of this software for any
+// purpose. It is provided "as is" without express or implied
+// warranty.
+
+/**
+ * @file basic_set_example.cpp
+ * A basic example showing how to use sets.
+ */
+
+/**
+ * This example shows how to use "sets". It defines a
+ * function performing a sequence of operations on
+ * a generic container. It then calls this function with some containers.
+ */
+
+#include <iostream>
+#include <cassert>
+#include <ext/pb_ds/assoc_container.hpp>
+#include <ext/pb_ds/tag_and_trait.hpp>
+
+using namespace std;
+using namespace __gnu_pbds;
+
+// The following function performs a sequence of operations on an
+// associative container object storing integers.
+template<class Cntnr>
+void
+some_op_sequence(Cntnr& r_c)
+{
+  assert(r_c.empty());
+  assert(r_c.size() == 0);
+
+  r_c.insert(1);
+  r_c.insert(2);
+
+  assert(!r_c.empty());
+  assert(r_c.size() == 2);
+
+  cout << "All value types in the container:" << endl;
+  for (typename Cntnr::const_iterator it = r_c.begin(); it != r_c.end();
+       ++it)
+    cout <<* it << " ";
+
+  cout << endl;
+
+  r_c.clear();
+
+  assert(r_c.empty());
+  assert(r_c.size() == 0);
+}
+
+int main()
+{
+  {
+    // Perform operations on a collision-chaining hash set.
+    cc_hash_table<int, null_mapped_type> c;
+    some_op_sequence(c);
+  }
+
+  {
+    // Perform operations on a general-probing hash set.
+    gp_hash_table<int, null_mapped_type> c;
+    some_op_sequence(c);
+  }
+
+  {
+    // Perform operations on a red-black tree set.
+    tree<int, null_mapped_type> c;
+    some_op_sequence(c);
+  }
+
+  {
+    // Perform operations on a splay tree set.
+    tree<
+      int,
+      null_mapped_type,
+      less<int>,
+      splay_tree_tag> c;
+    some_op_sequence(c);
+  }
+
+  {
+    // Perform operations on a splay tree set.
+    tree<
+      int,
+      null_mapped_type,
+      less<int>,
+      ov_tree_tag> c;
+    some_op_sequence(c);
+  }
+
+  {
+    // Perform operations on a list-update set.
+    list_update<int, null_mapped_type> c;
+    some_op_sequence(c);
+  }
+
+  return 0;
+}