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diff --git a/libstdc++-v3/testsuite/util/regression/basic_type.hpp b/libstdc++-v3/testsuite/util/regression/basic_type.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 basic_type.hpp
+ * Contains a type used for regression tests' key and data.
+ */
+
+#ifndef PB_DS_BASIC_TYPE_HPP
+#define PB_DS_BASIC_TYPE_HPP
+
+#include <string>
+#include <ext/throw_allocator.h>
+
+namespace __gnu_pbds
+{
+namespace test
+{
+#define PB_DS_BASE_C_DEC \
+  std::basic_string<char, std::char_traits<char>, \
+		    __gnu_cxx::throw_allocator<char> >
+
+  struct basic_type : public PB_DS_BASE_C_DEC
+  {
+  private:
+    typedef PB_DS_BASE_C_DEC base_type;
+
+  public:
+    enum
+      {
+	distinct_chars = 4
+      };
+
+    basic_type() { }
+
+    template<typename Gen>
+    basic_type(Gen& r_gen, size_t max)
+    {
+      size_t rnd = r_gen.get_unsigned_long(0, static_cast<unsigned long>(max));
+      while (rnd > 0)
+	{
+	  base_type::push_back('a' + static_cast<char>(rnd % distinct_chars));
+	  rnd /= distinct_chars;
+	}
+    }
+
+    basic_type(const std::string other)
+    {
+      std::string::const_iterator it = other.begin();
+      while (it != other.end())
+	{
+	  base_type::push_back(*it);
+	  ++it;
+	}
+    }
+
+    operator std::string() const
+    { return std::string(base_type::c_str());}
+  };
+
+#undef PB_DS_BASE_C_DEC
+
+} // namespace test
+} // namespace __gnu_pbds
+
+#endif