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diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/parallel/checkers.h b/i686-linux-gnu-4.7/usr/include/c++/4.7/parallel/checkers.h
new file mode 100644
index 0000000..32507fd
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+++ b/i686-linux-gnu-4.7/usr/include/c++/4.7/parallel/checkers.h
@@ -0,0 +1,73 @@
+// -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 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/>.
+
+/** @file parallel/checkers.h
+ *  @brief Routines for checking the correctness of algorithm results.
+ *  This file is a GNU parallel extension to the Standard C++ Library.
+ */
+
+// Written by Johannes Singler.
+
+#ifndef _GLIBCXX_PARALLEL_CHECKERS_H
+#define _GLIBCXX_PARALLEL_CHECKERS_H 1
+
+#include <cstdio>
+#include <bits/stl_algobase.h>
+#include <bits/stl_function.h>
+
+namespace __gnu_parallel
+{
+  /**
+   * @brief Check whether @c [__begin, @c __end) is sorted according
+   * to @c __comp.
+   * @param __begin Begin iterator of sequence.
+   * @param __end End iterator of sequence.
+   * @param __comp Comparator.
+   * @return @c true if sorted, @c false otherwise.
+   */
+  template<typename _IIter, typename _Compare>
+    bool
+    __is_sorted(_IIter __begin, _IIter __end, _Compare __comp)
+    {
+      if (__begin == __end)
+        return true;
+
+      _IIter __current(__begin), __recent(__begin);
+
+      unsigned long long __position = 1;
+      for (__current++; __current != __end; __current++)
+        {
+          if (__comp(*__current, *__recent))
+            {
+              return false;
+            }
+          __recent = __current;
+          __position++;
+        }
+
+      return true;
+    }
+}
+
+#endif /* _GLIBCXX_PARALLEL_CHECKERS_H */