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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/cond_dealtor.hpp b/libstdc++-v3/include/ext/pb_ds/detail/cond_dealtor.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 cond_dealtor.hpp
+ * Contains a conditional deallocator.
+ */
+
+#ifndef PB_DS_COND_DEALTOR_HPP
+#define PB_DS_COND_DEALTOR_HPP
+
+namespace __gnu_pbds
+{
+
+  namespace detail
+  {
+
+#define PB_DS_COND_DEALTOR_CLASS_T_DEC		\
+    template<typename Entry, class Allocator>
+
+#define PB_DS_COND_DEALTOR_CLASS_C_DEC				\
+    cond_dealtor<						\
+						Entry,		\
+						Allocator>
+
+    template<typename Entry, class Allocator>
+    class cond_dealtor
+    {
+    public:
+      typedef
+      typename Allocator::template rebind<Entry>::other
+      entry_allocator;
+
+      typedef typename entry_allocator::pointer entry_pointer;
+
+    public:
+      inline
+      cond_dealtor(entry_pointer p_e);
+
+      inline
+      ~cond_dealtor();
+
+      inline void
+      set_no_action();
+
+    private:
+      entry_pointer m_p_e;
+
+      bool m_no_action_destructor;
+
+      static entry_allocator s_alloc;
+    };
+
+    PB_DS_COND_DEALTOR_CLASS_T_DEC
+    typename PB_DS_COND_DEALTOR_CLASS_C_DEC::entry_allocator
+    PB_DS_COND_DEALTOR_CLASS_C_DEC::s_alloc;
+
+    PB_DS_COND_DEALTOR_CLASS_T_DEC
+    inline
+    PB_DS_COND_DEALTOR_CLASS_C_DEC::
+    cond_dealtor(entry_pointer p_e) :
+      m_p_e(p_e),
+      m_no_action_destructor(false)
+    { }
+
+    PB_DS_COND_DEALTOR_CLASS_T_DEC
+    inline void
+    PB_DS_COND_DEALTOR_CLASS_C_DEC::
+    set_no_action()
+    {
+      m_no_action_destructor = true;
+    }
+
+    PB_DS_COND_DEALTOR_CLASS_T_DEC
+    inline
+    PB_DS_COND_DEALTOR_CLASS_C_DEC::
+    ~cond_dealtor()
+    {
+      if (m_no_action_destructor)
+        return;
+
+      s_alloc.deallocate(m_p_e, 1);
+    }
+
+#undef PB_DS_COND_DEALTOR_CLASS_T_DEC
+#undef PB_DS_COND_DEALTOR_CLASS_C_DEC
+
+  } // namespace detail
+
+} // namespace __gnu_pbds
+
+#endif // #ifndef PB_DS_COND_DEALTOR_HPP
+