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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/hash_fn/ranged_hash_fn.hpp b/libstdc++-v3/include/ext/pb_ds/detail/hash_fn/ranged_hash_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 ranged_hash_fn.hpp
+ * Contains a unified ranged hash functor, allowing the hash tables
+ * to deal with a single class for ranged hashing.
+ */
+
+#ifndef PB_DS_RANGED_HASH_FN_HPP
+#define PB_DS_RANGED_HASH_FN_HPP
+
+#include <ext/pb_ds/detail/basic_types.hpp>
+#include <utility>
+#include <debug/debug.h>
+
+namespace __gnu_pbds
+{
+  namespace detail
+  {
+    template<typename Key, typename Hash_Fn, typename Allocator, 
+	     typename Comb_Hash_Fn, bool Store_Hash>
+    class ranged_hash_fn;
+
+#define PB_DS_CLASS_T_DEC \
+    template<typename Key, typename Hash_Fn, typename Allocator, \
+	     typename Comb_Hash_Fn>
+
+#define PB_DS_CLASS_C_DEC \
+    ranged_hash_fn<Key,	Hash_Fn, Allocator, Comb_Hash_Fn, false>
+
+    /**
+     * Specialization 1
+     * The client supplies a hash function and a ranged hash function,
+     * and requests that hash values not be stored.
+     **/
+    template<typename Key, typename Hash_Fn, typename Allocator, 
+	     typename Comb_Hash_Fn>
+    class ranged_hash_fn< Key, Hash_Fn, Allocator, Comb_Hash_Fn, false> 
+    : public Hash_Fn, public Comb_Hash_Fn
+    {
+    protected:
+      typedef typename Allocator::size_type size_type;
+      typedef Hash_Fn hash_fn_base;
+      typedef Comb_Hash_Fn comb_hash_fn_base;
+      typedef typename Allocator::template rebind< Key>::other key_allocator;
+      typedef typename key_allocator::const_reference const_key_reference;
+
+      ranged_hash_fn(size_type);
+
+      ranged_hash_fn(size_type, const Hash_Fn&);
+
+      ranged_hash_fn(size_type, const Hash_Fn&, const Comb_Hash_Fn&);
+
+      void
+      swap(PB_DS_CLASS_C_DEC&);
+
+      void
+      notify_resized(size_type);
+
+      inline size_type
+      operator()(const_key_reference) const;
+    };
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size)
+    { Comb_Hash_Fn::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn) 
+    : Hash_Fn(r_hash_fn)
+    { Comb_Hash_Fn::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn, 
+		   const Comb_Hash_Fn& r_comb_hash_fn) 
+    : Hash_Fn(r_hash_fn), Comb_Hash_Fn(r_comb_hash_fn)
+    { comb_hash_fn_base::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    swap(PB_DS_CLASS_C_DEC& other)
+    {
+      comb_hash_fn_base::swap(other);
+      std::swap((Hash_Fn& )(*this), (Hash_Fn& )other);
+    }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    notify_resized(size_type size)
+    { comb_hash_fn_base::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    inline typename PB_DS_CLASS_C_DEC::size_type
+    PB_DS_CLASS_C_DEC::
+    operator()(const_key_reference r_key) const
+    { return (comb_hash_fn_base::operator()(hash_fn_base::operator()(r_key)));}
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+
+#define PB_DS_CLASS_T_DEC \
+    template<typename Key, typename Hash_Fn, typename Allocator, \
+	     typename Comb_Hash_Fn>
+
+#define PB_DS_CLASS_C_DEC \
+    ranged_hash_fn<Key,Hash_Fn,	Allocator, Comb_Hash_Fn, true>
+
+    /**
+     * Specialization 2
+     * The client supplies a hash function and a ranged hash function,
+     * and requests that hash values be stored.
+     **/
+    template<typename Key, typename Hash_Fn, typename Allocator,
+	     typename Comb_Hash_Fn>
+    class ranged_hash_fn<Key, Hash_Fn, Allocator, Comb_Hash_Fn, true> 
+    : public Hash_Fn, public Comb_Hash_Fn
+    {
+    protected:
+      typedef typename Allocator::size_type size_type;
+      typedef std::pair<size_type, size_type> comp_hash;
+      typedef Hash_Fn hash_fn_base;
+      typedef Comb_Hash_Fn comb_hash_fn_base;
+      typedef typename Allocator::template rebind<Key>::other key_allocator;
+      typedef typename key_allocator::const_reference const_key_reference;
+
+      ranged_hash_fn(size_type);
+
+      ranged_hash_fn(size_type, const Hash_Fn&);
+
+      ranged_hash_fn(size_type, const Hash_Fn&, const Comb_Hash_Fn&);
+
+      void
+      swap(PB_DS_CLASS_C_DEC&);
+
+      void
+      notify_resized(size_type);
+
+      inline comp_hash
+      operator()(const_key_reference) const;
+
+      inline comp_hash
+      operator()(const_key_reference, size_type) const;
+    };
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size)
+    { Comb_Hash_Fn::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn) :
+      Hash_Fn(r_hash_fn)
+    { Comb_Hash_Fn::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size, const Hash_Fn& r_hash_fn, 
+		   const Comb_Hash_Fn& r_comb_hash_fn) 
+    : Hash_Fn(r_hash_fn), Comb_Hash_Fn(r_comb_hash_fn)
+    { comb_hash_fn_base::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    swap(PB_DS_CLASS_C_DEC& other)
+    {
+      comb_hash_fn_base::swap(other);
+      std::swap((Hash_Fn& )(*this), (Hash_Fn& )other);
+    }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    notify_resized(size_type size)
+    { comb_hash_fn_base::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    inline typename PB_DS_CLASS_C_DEC::comp_hash
+    PB_DS_CLASS_C_DEC::
+    operator()(const_key_reference r_key) const
+    {
+      const size_type hash = hash_fn_base::operator()(r_key);
+      return std::make_pair(comb_hash_fn_base::operator()(hash), hash);
+    }
+
+    PB_DS_CLASS_T_DEC
+    inline typename PB_DS_CLASS_C_DEC::comp_hash
+    PB_DS_CLASS_C_DEC::
+    operator()
+#ifdef _GLIBCXX_DEBUG
+      (const_key_reference r_key, size_type hash) const
+#else 
+      (const_key_reference /*r_key*/, size_type hash) const
+#endif
+    {
+      _GLIBCXX_DEBUG_ASSERT(hash == hash_fn_base::operator()(r_key));
+      return std::make_pair(comb_hash_fn_base::operator()(hash), hash);
+    }
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+
+#define PB_DS_CLASS_T_DEC \
+    template<typename Key, typename Allocator, typename Comb_Hash_Fn>
+
+#define PB_DS_CLASS_C_DEC \
+    ranged_hash_fn<Key,	null_hash_fn, Allocator, Comb_Hash_Fn, false>
+
+    /**
+     * Specialization 3
+     * The client does not supply a hash function (by specifying
+     * null_hash_fn as the Hash_Fn parameter), and requests that hash
+     * values not be stored.
+     **/
+    template<typename Key, typename Allocator, typename Comb_Hash_Fn>
+    class ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, false> 
+    : public null_hash_fn, public Comb_Hash_Fn
+    {
+    protected:
+      typedef typename Allocator::size_type size_type;
+      typedef Comb_Hash_Fn comb_hash_fn_base;
+
+      ranged_hash_fn(size_type);
+
+      ranged_hash_fn(size_type, const Comb_Hash_Fn&);
+
+      ranged_hash_fn(size_type, const null_hash_fn&, const Comb_Hash_Fn&);
+
+      void
+      swap(PB_DS_CLASS_C_DEC&);
+    };
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size)
+    { Comb_Hash_Fn::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size, const Comb_Hash_Fn& r_comb_hash_fn) :
+      Comb_Hash_Fn(r_comb_hash_fn)
+    { }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size, const null_hash_fn& r_null_hash_fn, 
+		   const Comb_Hash_Fn& r_comb_hash_fn) 
+    : Comb_Hash_Fn(r_comb_hash_fn)
+    { }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    swap(PB_DS_CLASS_C_DEC& other)
+    { comb_hash_fn_base::swap(other); }
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+
+#define PB_DS_CLASS_T_DEC \
+    template<typename Key, typename Allocator, typename Comb_Hash_Fn>
+
+#define PB_DS_CLASS_C_DEC \
+    ranged_hash_fn<Key,	null_hash_fn, Allocator, Comb_Hash_Fn, true>
+
+    /**
+     * Specialization 4
+     * The client does not supply a hash function (by specifying
+     * null_hash_fn as the Hash_Fn parameter), and requests that hash
+     * values be stored.
+     **/
+    template<typename Key, typename Allocator, typename Comb_Hash_Fn>
+    class ranged_hash_fn<Key, null_hash_fn, Allocator, Comb_Hash_Fn, true> 
+    : public null_hash_fn, public Comb_Hash_Fn
+    {
+    protected:
+      typedef typename Allocator::size_type size_type;
+      typedef Comb_Hash_Fn comb_hash_fn_base;
+
+      ranged_hash_fn(size_type);
+
+      ranged_hash_fn(size_type, const Comb_Hash_Fn&);
+
+      ranged_hash_fn(size_type, const null_hash_fn&, const Comb_Hash_Fn&);
+
+      void
+      swap(PB_DS_CLASS_C_DEC&);
+    };
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size)
+    { Comb_Hash_Fn::notify_resized(size); }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size, const Comb_Hash_Fn& r_comb_hash_fn) 
+    : Comb_Hash_Fn(r_comb_hash_fn)
+    { }
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    ranged_hash_fn(size_type size, const null_hash_fn& r_null_hash_fn, 
+		   const Comb_Hash_Fn& r_comb_hash_fn) 
+    : Comb_Hash_Fn(r_comb_hash_fn)
+    { }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    swap(PB_DS_CLASS_C_DEC& other)
+    { comb_hash_fn_base::swap(other); }
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+
+  } // namespace detail
+} // namespace __gnu_pbds
+
+#endif