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+//===-- llvm/ADT/iterator - Portable wrapper around <iterator> --*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides a wrapper around the mysterious <iterator> header file.
+// In GCC 2.95.3, the file defines a bidirectional_iterator class (and other
+// friends), instead of the standard iterator class. In GCC 3.1, the
+// bidirectional_iterator class got moved out and the new, standards compliant,
+// iterator<> class was added. Because there is nothing that we can do to get
+// correct behavior on both compilers, we have this header with #ifdef's. Gross
+// huh?
+//
+// By #includ'ing this file, you get the contents of <iterator> plus the
+// following classes in the global namespace:
+//
+// 1. bidirectional_iterator
+// 2. forward_iterator
+//
+// The #if directives' expressions are filled in by Autoconf.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_ITERATOR
+#define LLVM_ADT_ITERATOR
+
+#include <iterator>
+
+#undef HAVE_BI_ITERATOR
+#undef HAVE_STD_ITERATOR
+#undef HAVE_FWD_ITERATOR
+
+// defined by Kevin
+#define HAVE_STD_ITERATOR 1
+
+#ifdef _MSC_VER
+# define HAVE_BI_ITERATOR 0
+# define HAVE_STD_ITERATOR 1
+# define HAVE_FWD_ITERATOR 0
+#endif
+
+#if !HAVE_BI_ITERATOR
+# if HAVE_STD_ITERATOR
+/// If the bidirectional iterator is not defined, we attempt to define it in
+/// terms of the C++ standard iterator. Otherwise, we import it with a "using"
+/// statement.
+///
+template<class Ty, class PtrDiffTy>
+struct bidirectional_iterator
+ : public std::iterator<std::bidirectional_iterator_tag, Ty, PtrDiffTy> {
+};
+# else
+# error "Need to have standard iterator to define bidirectional iterator!"
+# endif
+#else
+using std::bidirectional_iterator;
+#endif
+
+#if !HAVE_FWD_ITERATOR
+# if HAVE_STD_ITERATOR
+/// If the forward iterator is not defined, attempt to define it in terms of
+/// the C++ standard iterator. Otherwise, we import it with a "using" statement.
+///
+template<class Ty, class PtrDiffTy>
+struct forward_iterator
+ : public std::iterator<std::forward_iterator_tag, Ty, PtrDiffTy> {
+};
+# else
+# error "Need to have standard iterator to define forward iterator!"
+# endif
+#else
+using std::forward_iterator;
+#endif
+
+#endif