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diff --git a/libstdc++-v3/testsuite/util/common_type/assoc/detail/ds_string_form.hpp b/libstdc++-v3/testsuite/util/common_type/assoc/detail/ds_string_form.hpp
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+++ b/libstdc++-v3/testsuite/util/common_type/assoc/detail/ds_string_form.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.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING3.  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 ds_string_form.hpp
+ * Transforms containers into string form.
+ */
+
+#ifndef PB_DS_DS_STRING_FORM_HPP
+#define PB_DS_DS_STRING_FORM_HPP
+
+#include <string>
+#include <ext/pb_ds/tag_and_trait.hpp>
+#include <common_type/assoc/detail/list_update_policy_string_form.hpp>
+#include <common_type/assoc/detail/comb_hash_fn_string_form.hpp>
+#include <common_type/assoc/detail/resize_policy_string_form.hpp>
+#include <common_type/assoc/detail/probe_fn_string_form.hpp>
+#include <common_type/assoc/detail/tree_supports_order_statistics.hpp>
+#include <common_type/assoc/detail/trie_supports_order_statistics.hpp>
+#include <common_type/assoc/detail/trie_supports_prefix_search.hpp>
+#include <common_type/assoc/detail/store_hash_string_form.hpp>
+#include <io/xml.hpp>
+
+namespace __gnu_pbds
+{
+  namespace test
+  {
+    namespace detail
+    {
+      template<typename Cntnr, class Tag>
+      struct ds_string_form;
+
+      template<typename Cntnr>
+      struct ds_string_form<Cntnr, __gnu_pbds::cc_hash_tag>
+      {
+	static std::string
+        name()
+	{
+	  return ("cc_hash_" +
+		  comb_hash_fn_string_form<typename Cntnr::comb_hash_fn>::name() +
+		  resize_policy_string_form<typename Cntnr::resize_policy>::name() +
+		  store_hash_string_form<Cntnr::store_hash>::name());
+	}
+
+	static std::string
+        desc()
+	{
+	  const std::string comb_hash_fn_desc =
+            comb_hash_fn_string_form<typename Cntnr::comb_hash_fn>::desc();
+
+	  const std::string resize_policy_desc =
+            resize_policy_string_form<typename Cntnr::resize_policy>::desc();
+
+	  const std::string store_hash_desc =
+            store_hash_string_form<Cntnr::store_hash>::desc();
+
+	  return (make_xml_tag("type", "value", "cc_hash_table", comb_hash_fn_desc + resize_policy_desc + store_hash_desc));
+	}
+      };
+
+      template<typename Cntnr>
+      struct ds_string_form<Cntnr, __gnu_pbds::gp_hash_tag>
+      {
+	static std::string
+        name()
+	{
+	  return ("gp_hash_" +
+		  comb_hash_fn_string_form<typename Cntnr::comb_probe_fn>::name() +
+		  probe_fn_string_form<typename Cntnr::probe_fn>::name() +
+		  resize_policy_string_form<typename Cntnr::resize_policy>::name() +
+		  store_hash_string_form<Cntnr::store_hash>::name());
+	}
+
+	static std::string
+        desc()
+	{
+	  const std::string comb_probe_fn_desc =
+            comb_hash_fn_string_form<typename Cntnr::comb_probe_fn>::desc();
+
+	  const std::string probe_fn_desc =
+            probe_fn_string_form<typename Cntnr::probe_fn>::desc();
+
+	  const std::string resize_policy_desc =
+            resize_policy_string_form<typename Cntnr::resize_policy>::desc();
+
+	  const std::string store_hash_desc =
+            store_hash_string_form<Cntnr::store_hash>::desc();
+	  
+	  return make_xml_tag("type", "value", "gp_hash_table", 
+			      comb_probe_fn_desc + probe_fn_desc + resize_policy_desc + store_hash_desc);
+	}
+      };
+
+      template<typename Cntnr>
+      struct tree_ds_string_form
+      {
+	static std::string
+        name(const std::string container_category_str)
+	{
+	  if (tree_supports_order_statistics<Cntnr>::value)
+            return (container_category_str + "ost_");
+	  return container_category_str;
+	}
+
+	static std::string
+        desc(const std::string container_category_str)
+	{
+	  const std::string category_str =
+            make_xml_tag("Tag",  "value",  container_category_str);
+
+	  const std::string node_update_str =
+            make_xml_tag("Node_Update",
+			 "value",(tree_supports_order_statistics<Cntnr>::value ?
+	 "tree_order_statistics_node_update" : "null_tree_node_update"));
+
+	  return make_xml_tag("type", "value", "tree", category_str + node_update_str);
+	}
+      };
+
+      template<typename Cntnr>
+      struct ds_string_form<Cntnr, __gnu_pbds::rb_tree_tag> 
+      : private tree_ds_string_form<Cntnr>
+      {
+      private:
+	typedef tree_ds_string_form< Cntnr> base_type;
+
+      public:
+	static std::string
+        name()
+	{ return base_type::name("rb_tree_"); }
+
+	static std::string
+        desc()
+	{ return base_type::desc("rb_tree_tag"); }
+      };
+
+      template<typename Cntnr>
+      struct ds_string_form<Cntnr, __gnu_pbds::splay_tree_tag> 
+      : private tree_ds_string_form<Cntnr>
+      {
+      private:
+	typedef tree_ds_string_form< Cntnr> base_type;
+
+      public:
+	static std::string
+        name()
+	{ return base_type::name("splay_tree_"); }
+
+	static std::string
+        desc()
+	{ return base_type::desc("splay_tree_tag"); }
+      };
+
+      template<typename Cntnr>
+      struct ds_string_form<Cntnr, __gnu_pbds::ov_tree_tag> 
+      : private tree_ds_string_form<Cntnr>
+      {
+      private:
+	typedef tree_ds_string_form< Cntnr> base_type;
+
+      public:
+	static std::string
+        name()
+	{ return (base_type::name("ov_tree_")); }
+
+	static std::string
+        desc()
+	{ return (base_type::desc("ov_tree_tag")); }
+      };
+
+      template<typename Cntnr>
+      struct ds_string_form<Cntnr, __gnu_pbds::list_update_tag>
+      {
+	static std::string
+        name()
+	{
+	  return ("lu_" +
+		  lu_policy_string_form<typename Cntnr::update_policy>::name());
+	}
+
+	static std::string
+        desc()
+	{
+	  return make_xml_tag("type", "value", "list_update",
+			       lu_policy_string_form<typename Cntnr::update_policy>::desc());
+	}
+      };
+
+      template<typename Cntnr>
+      struct ds_string_form<Cntnr, __gnu_pbds::pat_trie_tag>
+      {
+	static std::string
+        name()
+	{
+	  if (trie_supports_order_statistics<Cntnr>::value)
+            return ("pat_trie_ost_");
+
+	  if (trie_supports_prefix_search<Cntnr>::value)
+            return ("pat_trie_prs_");
+
+	  return ("pat_trie_");
+	}
+
+	static std::string
+        desc()
+	{
+	  std::string category_s = make_xml_tag("Tag", "value", "pat_trie_tag");
+	  const char* s;
+	  if (trie_supports_order_statistics<Cntnr>::value)
+            s = "trie_order_statistics_node_update";
+	  else if (trie_supports_prefix_search<Cntnr>::value)
+	    s = "trie_prefix_search_node_update";
+	  else
+            s = "null_trie_node_update";
+	  std::string node_s = make_xml_tag("Node_Update", "value", s);
+	  return make_xml_tag("type", "value", "trie", category_s + node_s);
+	}
+      };
+
+    } // namespace detail
+
+  } // namespace test
+
+} // namespace __gnu_pbds
+
+#endif // #ifndef PB_DS_DS_STRING_FORM_HPP
+