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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/resize_policy/sample_resize_trigger.hpp b/libstdc++-v3/include/ext/pb_ds/detail/resize_policy/sample_resize_trigger.hpp
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+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2007, 2008, 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_resize_trigger.hpp
+ * Contains a sample resize trigger policy class.
+ */
+
+#ifndef PB_DS_SAMPLE_RESIZE_TRIGGER_HPP
+#define PB_DS_SAMPLE_RESIZE_TRIGGER_HPP
+
+// A sample resize trigger policy.
+class sample_resize_trigger
+{
+public:
+
+  // Size type.
+  typedef size_t size_type;
+
+  // Default constructor.
+  sample_resize_trigger();
+
+  // Copy constructor.
+  sample_range_hashing(const sample_resize_trigger& other);
+
+  // Swaps content.
+  inline void
+  swap(sample_resize_trigger& other);
+
+protected:
+
+  // Notifies a search started.
+  inline void
+  notify_insert_search_start();
+
+  // Notifies a search encountered a collision.
+  inline void
+  notify_insert_search_collision();
+
+  // Notifies a search ended.
+  inline void
+  notify_insert_search_end();
+
+  // Notifies a search started.
+  inline void
+  notify_find_search_start();
+
+  // Notifies a search encountered a collision.
+  inline void
+  notify_find_search_collision();
+
+  // Notifies a search ended.
+  inline void
+  notify_find_search_end();
+
+  // Notifies a search started.
+  inline void
+  notify_erase_search_start();
+
+  // Notifies a search encountered a collision.
+  inline void
+  notify_erase_search_collision();
+
+  // Notifies a search ended.
+  inline void
+  notify_erase_search_end();
+
+  // Notifies an element was inserted. the total number of entries in
+  // the table is num_entries.
+  inline void
+  notify_inserted(size_type num_entries);
+
+  // Notifies an element was erased.
+  inline void
+  notify_erased(size_type num_entries);
+
+  // Notifies the table was cleared.
+  void
+  notify_cleared();
+
+  // Notifies the table was resized as a result of this object's
+  // signifying that a resize is needed.
+  void
+  notify_resized(size_type new_size);
+
+  // Notifies the table was resized externally.
+  void
+  notify_externally_resized(size_type new_size);
+
+  // Queries whether a resize is needed.
+  inline bool
+  is_resize_needed() const;
+
+  // Queries whether a grow is needed.
+  inline bool
+  is_grow_needed(size_type size, size_type num_entries) const;
+
+private:
+
+  // Resizes to new_size.
+  virtual void
+  do_resize(size_type new_size);
+};
+
+#endif