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diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/pb_ds/detail/tree_trace_base.hpp b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/pb_ds/detail/tree_trace_base.hpp
new file mode 100644
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+++ b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/pb_ds/detail/tree_trace_base.hpp
@@ -0,0 +1,179 @@
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2009, 2011 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 detail/tree_trace_base.hpp
+ * Contains tree-related policies.
+ */
+
+#ifndef PB_DS_TREE_TRACE_BASE_HPP
+#define PB_DS_TREE_TRACE_BASE_HPP
+
+#ifdef PB_DS_TREE_TRACE
+
+#include <ext/pb_ds/detail/branch_policy/branch_policy.hpp>
+#include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp>
+
+namespace __gnu_pbds
+{
+  namespace detail
+  {
+#ifdef PB_DS_TREE_TRACE
+
+#define PB_DS_CLASS_T_DEC						\
+    template<typename Node_CItr, typename Node_Itr,	\
+	     typename Cmp_Fn, bool Node_Based, typename _Alloc>
+
+#define PB_DS_CLASS_C_DEC						\
+    tree_trace_base<Node_CItr, Node_Itr, Cmp_Fn,         \
+		    Node_Based, _Alloc>
+
+#define PB_DS_TRACE_BASE \
+    branch_policy<Node_CItr, Node_Itr, _Alloc>
+
+    /// Tracing base class.
+    template<typename Node_CItr, typename Node_Itr,
+	     typename Cmp_Fn, bool Node_Based, typename _Alloc>
+    class tree_trace_base : private PB_DS_TRACE_BASE
+    {
+    public:
+      void
+      trace() const;
+
+    private:
+      typedef PB_DS_TRACE_BASE 			base_type;
+      typedef Node_CItr 		node_const_iterator;
+      typedef typename _Alloc::size_type 	size_type;
+
+      void
+      trace_node(node_const_iterator, size_type) const;
+
+      virtual bool
+      empty() const = 0;
+
+      virtual node_const_iterator
+      node_begin() const = 0;
+
+      virtual node_const_iterator
+      node_end() const = 0;
+
+      static void
+      print_node_pointer(Node_CItr, integral_constant<int,true>);
+
+      static void
+      print_node_pointer(Node_CItr, integral_constant<int,false>);
+
+      template<typename Metadata_>
+      static void
+      trace_it_metadata(Node_CItr, type_to_type<Metadata_>);
+
+      static void
+      trace_it_metadata(Node_CItr, type_to_type<null_type>);
+    };
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    trace() const
+    {
+      if (empty())
+	return;
+      trace_node(node_begin(), 0);
+    }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    trace_node(node_const_iterator nd_it, size_type level) const
+    {
+      if (nd_it.get_r_child() != node_end())
+	trace_node(nd_it.get_r_child(), level + 1);
+
+      for (size_type i = 0; i < level; ++i)
+	std::cerr << ' ';
+
+      print_node_pointer(nd_it, integral_constant<int,Node_Based>());
+      std::cerr << base_type::extract_key(*(*nd_it));
+
+      typedef type_to_type<typename node_const_iterator::metadata_type>
+	m_type_ind_t;
+
+      trace_it_metadata(nd_it, m_type_ind_t());
+
+      std::cerr << std::endl;
+
+      if (nd_it.get_l_child() != node_end())
+	trace_node(nd_it.get_l_child(), level + 1);
+    }
+
+    PB_DS_CLASS_T_DEC
+    template<typename Metadata_>
+    void
+    PB_DS_CLASS_C_DEC::
+    trace_it_metadata(Node_CItr nd_it, type_to_type<Metadata_>)
+    {
+      const unsigned long ul = static_cast<unsigned long>(nd_it.get_metadata());
+      std::cerr << " (" << ul << ") ";
+    }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    trace_it_metadata(Node_CItr, type_to_type<null_type>)
+    { }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    print_node_pointer(Node_CItr nd_it, integral_constant<int,true>)
+    { std::cerr << nd_it.m_p_nd << " "; }
+
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    print_node_pointer(Node_CItr nd_it, integral_constant<int,false>)
+    { std::cerr << *nd_it << " "; }
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+#undef PB_DS_TRACE_BASE
+#endif // #ifdef    PB_DS_TREE_TRACE
+
+  } // namespace detail
+} // namespace __gnu_pbds
+
+#endif // #ifdef PB_DS_TREE_TRACE
+
+#endif // #ifndef PB_DS_TREE_TRACE_BASE_HPP