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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/types_traits.hpp b/libstdc++-v3/include/ext/pb_ds/detail/types_traits.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 types_traits.hpp
+ * Contains a traits class of types used by containers.
+ */
+
+#ifndef PB_DS_TYPES_TRAITS_HPP
+#define PB_DS_TYPES_TRAITS_HPP
+
+#include <ext/pb_ds/detail/basic_types.hpp>
+#include <ext/pb_ds/detail/type_utils.hpp>
+#include <utility>
+
+namespace __gnu_pbds
+{
+  namespace detail
+  {
+    template<typename Key, typename Mapped, typename Alloc, bool Store_Extra>
+    struct vt_base_selector
+    {
+      typedef value_type_base<Key, Mapped, Alloc, Store_Extra> type;
+    };
+
+    template<typename Key, typename Mapped, typename Alloc, bool Store_Extra>
+    struct types_traits 
+    : public vt_base_selector<Key, Mapped, Alloc, Store_Extra>::type
+    {
+      typedef typename Alloc::template rebind<Key>::other key_allocator;
+      typedef typename key_allocator::value_type key_type;
+      typedef typename key_allocator::pointer key_pointer;
+      typedef typename key_allocator::const_pointer const_key_pointer;
+      typedef typename key_allocator::reference key_reference;
+      typedef typename key_allocator::const_reference const_key_reference;
+      typedef typename Alloc::size_type size_type;
+
+      // Extra value (used when the extra value is stored with each value).
+      typedef std::pair<size_type, size_type> 	comp_hash;
+
+      typedef integral_constant<int, Store_Extra> store_extra;
+      store_extra	m_store_extra_indicator;
+
+      typedef typename no_throw_copies<Key, Mapped>::indicator no_throw_copies;
+      no_throw_copies 	m_no_throw_copies_indicator;
+    };
+  } // namespace detail
+} // namespace __gnu_pbds
+
+#endif