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diff --git a/libstdc++-v3/include/ext/pb_ds/priority_queue.hpp b/libstdc++-v3/include/ext/pb_ds/priority_queue.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 priority_queue.hpp
+ * Contains priority_queues.
+ */
+
+#ifndef PB_DS_PRIORITY_QUEUE_HPP
+#define PB_DS_PRIORITY_QUEUE_HPP
+
+#include <ext/pb_ds/tag_and_trait.hpp>
+#include <ext/pb_ds/detail/priority_queue_base_dispatch.hpp>
+#include <ext/pb_ds/detail/standard_policies.hpp>
+
+namespace __gnu_pbds
+{
+  // A priority queue.
+  template<typename Value_Type, 
+	   typename Cmp_Fn = std::less<Value_Type>,
+	   typename Tag = pairing_heap_tag,
+	   typename Allocator = std::allocator<char> >
+  class priority_queue 
+  : public detail::priority_queue_base_dispatch<Value_Type,Cmp_Fn,Tag,Allocator>::type
+  {
+  private:
+    typedef typename detail::priority_queue_base_dispatch<Value_Type,Cmp_Fn,Tag,Allocator>::type base_type;
+
+  public:
+    typedef Value_Type 					value_type;
+    typedef Cmp_Fn 					cmp_fn;
+    typedef Tag 					container_category;
+    typedef Allocator 					allocator_type;
+    typedef typename allocator_type::size_type 		size_type;
+    typedef typename allocator_type::difference_type 	difference_type;
+
+    typedef typename allocator_type::template rebind<value_type>::other value_rebind;
+    typedef typename value_rebind::reference 		reference;
+    typedef typename value_rebind::const_reference 	const_reference;
+    typedef typename value_rebind::pointer 	   	pointer;
+    typedef typename value_rebind::const_pointer 	const_pointer;
+
+    typedef typename base_type::const_point_iterator const_point_iterator;
+    typedef typename base_type::point_iterator 		point_iterator;
+    typedef typename base_type::const_iterator 		const_iterator;
+    typedef typename base_type::iterator 		iterator;
+
+    priority_queue() { }
+
+    // Constructor taking some policy objects. r_cmp_fn will be copied
+    // by the Cmp_Fn object of the container object.
+    priority_queue(const cmp_fn& r_cmp_fn) : base_type(r_cmp_fn) { }
+
+    // Constructor taking __iterators to a range of value_types. The
+    // value_types between first_it and last_it will be inserted into
+    // the container object.
+    template<typename It>
+    priority_queue(It first_it, It last_it)
+    { base_type::copy_from_range(first_it, last_it); }
+
+    // Constructor taking __iterators to a range of value_types and
+    // some policy objects The value_types between first_it and
+    // last_it will be inserted into the container object. r_cmp_fn
+    // will be copied by the cmp_fn object of the container object.
+    template<typename It>
+    priority_queue(It first_it, It last_it, const cmp_fn& r_cmp_fn)
+    : base_type(r_cmp_fn)
+    { base_type::copy_from_range(first_it, last_it); }
+
+    priority_queue(const priority_queue& other)
+    : base_type((const base_type& )other) { }
+
+    virtual
+    ~priority_queue() { }
+
+    priority_queue& 
+    operator=(const priority_queue& other)
+    {
+      if (this != &other)
+	{
+	  priority_queue tmp(other);
+	  swap(tmp);
+	}
+      return *this;
+    }
+
+    void
+    swap(priority_queue& other)
+    { base_type::swap(other); }
+  };
+} // namespace __gnu_pbds
+
+#endif