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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/sample_trie_e_access_traits.hpp b/libstdc++-v3/include/ext/pb_ds/detail/trie_policy/sample_trie_e_access_traits.hpp
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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.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  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 sample_trie_e_access_traits.hpp
+ * Contains a sample probe policy.
+ */
+
+#ifndef PB_DS_SAMPLE_TRIE_E_ACCESS_TRAITS_HPP
+#define PB_DS_SAMPLE_TRIE_E_ACCESS_TRAITS_HPP
+
+// A sample trie element-access traits.
+class sample_trie_e_access_traits
+{
+
+public:
+
+  // Size type.
+  typedef size_t size_type;
+
+  // Key type.
+  typedef std::string key_type;
+
+  // Const key reference type.
+  typedef
+  typename Allocator::template rebind<
+    key_type>::other::const_reference
+  const_key_reference;
+
+  // Element const iterator type.
+  typedef std::string::const_iterator const_iterator;
+
+  // Element type.
+  typedef char e_type;
+
+  enum
+    {
+      max_size = 4
+    };
+
+public:
+
+  // Returns a const_iterator to the first element of r_key.
+  inline static const_iterator
+  begin(const_key_reference r_key);
+
+  // Returns a const_iterator to the after-last element of r_key.
+  inline static const_iterator
+  end(const_key_reference r_key);
+
+  // Maps an element to a position.
+  inline static size_type
+  e_pos(e_type e);
+
+};
+
+#endif // #ifndef PB_DS_SAMPLE_TRIE_E_ACCESS_TRAITS_HPP