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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/leaf.hpp b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/leaf.hpp
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+++ b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/leaf.hpp
@@ -0,0 +1,171 @@
+// -*- 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 leaf.hpp
+ * Contains a pat_trie_leaf for a patricia tree.
+ */
+
+#ifndef PB_DS_PAT_TRIE_LEAF_HPP
+#define PB_DS_PAT_TRIE_LEAF_HPP
+
+#include <debug/debug.h>
+
+namespace __gnu_pbds
+{
+  namespace detail
+  {
+
+#define PB_DS_CLASS_T_DEC						\
+    template<								\
+						class Type_Traits,	\
+						class E_Access_Traits,	\
+						class Metadata,		\
+						class Allocator>
+
+#define PB_DS_CLASS_C_DEC						\
+    pat_trie_leaf<							\
+						Type_Traits,		\
+						E_Access_Traits,	\
+						Metadata,		\
+						Allocator>
+
+#define PB_DS_BASE_C_DEC					\
+    pat_trie_node_base<						\
+					Type_Traits,		\
+					E_Access_Traits,	\
+					Metadata,		\
+					Allocator>
+
+#define PB_DS_PAT_TRIE_SUBTREE_DEBUG_INFO_C_DEC				\
+    pat_trie_subtree_debug_info<					\
+							Type_Traits,	\
+							E_Access_Traits, \
+							Allocator>
+
+    template<typename Type_Traits,
+	     class E_Access_Traits,
+	     class Metadata,
+	     class Allocator>
+    struct pat_trie_leaf : public PB_DS_BASE_C_DEC
+    {
+    private:
+      typedef typename Type_Traits::value_type value_type;
+
+      typedef typename Type_Traits::const_reference const_reference;
+
+      typedef typename Type_Traits::reference reference;
+
+      typedef
+      typename Allocator::template rebind<
+	E_Access_Traits>::other::const_pointer
+      const_e_access_traits_pointer;
+
+#ifdef _GLIBCXX_DEBUG
+      typedef
+      typename PB_DS_BASE_C_DEC::subtree_debug_info
+      subtree_debug_info;
+#endif 
+
+      typedef PB_DS_BASE_C_DEC base_type;
+
+    public:
+      pat_trie_leaf(const_reference r_val);
+
+      inline reference
+      value();
+
+      inline const_reference
+      value() const;
+
+#ifdef _GLIBCXX_DEBUG
+      virtual subtree_debug_info
+      assert_valid_imp(const_e_access_traits_pointer p_traits) const;
+
+      virtual
+      ~pat_trie_leaf();
+#endif 
+
+    private:
+      pat_trie_leaf(const PB_DS_CLASS_C_DEC& other);
+
+      value_type m_value;
+    };
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    pat_trie_leaf(const_reference r_val) :
+    PB_DS_BASE_C_DEC(pat_trie_leaf_node_type), m_value(r_val)
+    { }
+
+    PB_DS_CLASS_T_DEC
+    inline typename PB_DS_CLASS_C_DEC::reference
+    PB_DS_CLASS_C_DEC::
+    value()
+    { return m_value; }
+
+    PB_DS_CLASS_T_DEC
+    inline typename PB_DS_CLASS_C_DEC::const_reference
+    PB_DS_CLASS_C_DEC::
+    value() const
+    { return m_value; }
+
+#ifdef _GLIBCXX_DEBUG
+    PB_DS_CLASS_T_DEC
+    typename PB_DS_CLASS_C_DEC::subtree_debug_info
+    PB_DS_CLASS_C_DEC::
+    assert_valid_imp(const_e_access_traits_pointer p_traits) const
+    {
+      _GLIBCXX_DEBUG_ASSERT(base_type::m_type == pat_trie_leaf_node_type);
+      subtree_debug_info ret;
+      const_reference r_val = value();
+      return std::make_pair(p_traits->begin(p_traits->extract_key(r_val)),
+			     p_traits->end(p_traits->extract_key(r_val)));
+    }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ~pat_trie_leaf() { }
+#endif 
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+#undef PB_DS_BASE_C_DEC
+#undef PB_DS_PAT_TRIE_SUBTREE_DEBUG_INFO_C_DEC
+
+  } // namespace detail
+} // namespace __gnu_pbds
+
+#endif