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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/eq_fn/hash_eq_fn.hpp b/libstdc++-v3/include/ext/pb_ds/detail/eq_fn/hash_eq_fn.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 hash_eq_fn.hpp
+ * Contains 2 eqivalence functions, one employing a hash value,
+ *    and one ignoring it.
+ */
+
+#ifndef PB_DS_HASH_EQ_FN_HPP
+#define PB_DS_HASH_EQ_FN_HPP
+
+#include <utility>
+#include <debug/debug.h>
+
+namespace __gnu_pbds
+{
+  namespace detail
+  {
+    template<typename Key, class Eq_Fn, class Allocator, bool Store_Hash>
+    struct hash_eq_fn;
+
+#define PB_DS_CLASS_T_DEC \
+    template<typename Key, class Eq_Fn, class Allocator>
+
+#define PB_DS_CLASS_C_DEC \
+    hash_eq_fn<Key, Eq_Fn, Allocator, false>
+
+    /**
+     * Specialization 1- The client requests that hash values not be stored.
+     **/
+    template<typename Key, class Eq_Fn, class Allocator>
+    struct hash_eq_fn<Key, Eq_Fn, Allocator, false> : public Eq_Fn
+    {
+      typedef Eq_Fn eq_fn_base;
+
+      typedef typename Allocator::template rebind<Key>::other key_allocator;
+
+      typedef typename key_allocator::const_reference const_key_reference;
+
+      hash_eq_fn();
+
+      hash_eq_fn(const Eq_Fn& r_eq_fn);
+
+      inline bool
+      operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const;
+
+      inline void
+      swap(const PB_DS_CLASS_C_DEC& other);
+    };
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    hash_eq_fn()
+    { }
+
+    PB_DS_CLASS_T_DEC
+    inline void
+    PB_DS_CLASS_C_DEC::
+    swap(const PB_DS_CLASS_C_DEC& other)
+    { std::swap((Eq_Fn& )(*this), (Eq_Fn& )other); }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    hash_eq_fn(const Eq_Fn& r_eq_fn) :
+      Eq_Fn(r_eq_fn)
+    { }
+
+    PB_DS_CLASS_T_DEC
+    inline bool
+    PB_DS_CLASS_C_DEC::
+    operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const
+    { return (eq_fn_base::operator()(r_lhs_key, r_rhs_key)); }
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+
+#define PB_DS_CLASS_T_DEC \
+    template<typename Key, class Eq_Fn, class Allocator>
+
+#define PB_DS_CLASS_C_DEC \
+    hash_eq_fn<Key, Eq_Fn, Allocator, true>
+
+    /**
+     * Specialization 2- The client requests that hash values be stored.
+     **/
+    template<typename Key, class Eq_Fn, class Allocator>
+    struct hash_eq_fn<Key, Eq_Fn, Allocator, true> :
+      public Eq_Fn
+    {
+      typedef typename Allocator::size_type size_type;
+
+      typedef Eq_Fn eq_fn_base;
+
+      typedef typename Allocator::template rebind<Key>::other key_allocator;
+
+      typedef typename key_allocator::const_reference const_key_reference;
+
+      hash_eq_fn();
+
+      hash_eq_fn(const Eq_Fn& r_eq_fn);
+
+      inline bool
+      operator()(const_key_reference r_lhs_key, size_type lhs_hash, 
+		 const_key_reference r_rhs_key, size_type rhs_hash) const;
+
+      inline void
+      swap(const PB_DS_CLASS_C_DEC& other);
+    };
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    hash_eq_fn()
+    { }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    hash_eq_fn(const Eq_Fn& r_eq_fn) :
+      Eq_Fn(r_eq_fn)
+    { }
+
+    PB_DS_CLASS_T_DEC
+    inline bool
+    PB_DS_CLASS_C_DEC::
+    operator()(const_key_reference r_lhs_key, size_type lhs_hash, 
+	       const_key_reference r_rhs_key, size_type rhs_hash) const
+    {
+      _GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key) 
+		            || lhs_hash == rhs_hash);
+
+      return (lhs_hash == rhs_hash && 
+	      eq_fn_base::operator()(r_lhs_key, r_rhs_key));
+    }
+
+    PB_DS_CLASS_T_DEC
+    inline void
+    PB_DS_CLASS_C_DEC::
+    swap(const PB_DS_CLASS_C_DEC& other)
+    { std::swap((Eq_Fn& )(*this), (Eq_Fn& )(other)); }
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+
+  } // namespace detail
+} // namespace __gnu_pbds
+
+#endif