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diff --git a/libstdc++-v3/testsuite/ext/pb_ds/example/tree_order_statistics.cc b/libstdc++-v3/testsuite/ext/pb_ds/example/tree_order_statistics.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 tree_order_statistics_example.cpp
+ * An example showing how to use functors for order-statistics
+ *    in tree-based containers.
+ */
+
+/**
+ * In some cases tree structure can be used for various purposes asides
+ *    from storing entries by key order.
+ *    This example shows how a tree-based container can be used for
+ *    order-statistics, i.e., for determining the order of each key
+ *     in the (ordered) sequence of keys stored within the container object.
+ */
+
+#include <cassert>
+#include <ext/pb_ds/assoc_container.hpp>
+#include <ext/pb_ds/tree_policy.hpp>
+
+using namespace std;
+using namespace __gnu_pbds;
+
+// A red-black tree table storing ints and their order
+// statistics. Note that since the tree uses
+// tree_order_statistics_node_update as its update policy, then it
+// includes its methods by_order and order_of_key.
+typedef
+tree<
+  int,
+  null_mapped_type,
+  less<int>,
+  rb_tree_tag,
+  // This policy updates nodes' metadata for order statistics.
+  tree_order_statistics_node_update>
+set_t;
+
+int main()
+{
+  // Insert some entries into s.
+  set_t s;
+  s.insert(12);
+  s.insert(505);
+  s.insert(30);
+  s.insert(1000);
+  s.insert(10000);
+  s.insert(100);
+
+  // The order of the keys should be: 12, 30, 100, 505, 1000, 10000.
+  assert(*s.find_by_order(0) == 12);
+  assert(*s.find_by_order(1) == 30);
+  assert(*s.find_by_order(2) == 100);
+  assert(*s.find_by_order(3) == 505);
+  assert(*s.find_by_order(4) == 1000);
+  assert(*s.find_by_order(5) == 10000);
+  assert(s.find_by_order(6) == s.end());
+
+  // The order of the keys should be: 12, 30, 100, 505, 1000, 10000.
+  assert(s.order_of_key(10) == 0);
+  assert(s.order_of_key(12) == 0);
+  assert(s.order_of_key(15) == 1);
+  assert(s.order_of_key(30) == 1);
+  assert(s.order_of_key(99) == 2);
+  assert(s.order_of_key(100) == 2);
+  assert(s.order_of_key(505) == 3);
+  assert(s.order_of_key(1000) == 4);
+  assert(s.order_of_key(10000) == 5);
+  assert(s.order_of_key(9999999) == 6);
+
+  // Erase an entry.
+  s.erase(30);
+
+  // The order of the keys should be: 12, 100, 505, 1000, 10000.
+  assert(*s.find_by_order(0) == 12);
+  assert(*s.find_by_order(1) == 100);
+  assert(*s.find_by_order(2) == 505);
+  assert(*s.find_by_order(3) == 1000);
+  assert(*s.find_by_order(4) == 10000);
+  assert(s.find_by_order(5) == s.end());
+
+  // The order of the keys should be: 12, 100, 505, 1000, 10000.
+  assert(s.order_of_key(10) == 0);
+  assert(s.order_of_key(12) == 0);
+  assert(s.order_of_key(100) == 1);
+  assert(s.order_of_key(505) == 2);
+  assert(s.order_of_key(707) == 3);
+  assert(s.order_of_key(1000) == 3);
+  assert(s.order_of_key(1001) == 4);
+  assert(s.order_of_key(10000) == 4);
+  assert(s.order_of_key(100000) == 5);
+  assert(s.order_of_key(9999999) == 5);
+
+  return 0;
+}
+