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+// interator.hpp workarounds for non-conforming standard libraries ---------//
+
+// (C) Copyright Beman Dawes 2000. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See http://www.boost.org/libs/utility for documentation.
+
+// Revision History
+// 12 Jan 01 added <cstddef> for std::ptrdiff_t (Jens Maurer)
+// 28 Jun 00 Workarounds to deal with known MSVC bugs (David Abrahams)
+// 26 Jun 00 Initial version (Jeremy Siek)
+
+#ifndef BOOST_ITERATOR_HPP
+#define BOOST_ITERATOR_HPP
+
+#include <iterator>
+#include <cstddef> // std::ptrdiff_t
+#include <boost/config.hpp>
+
+namespace boost
+{
+# if defined(BOOST_NO_STD_ITERATOR) && !defined(BOOST_MSVC_STD_ITERATOR)
+ template <class Category, class T,
+ class Distance = std::ptrdiff_t,
+ class Pointer = T*, class Reference = T&>
+ struct iterator
+ {
+ typedef T value_type;
+ typedef Distance difference_type;
+ typedef Pointer pointer;
+ typedef Reference reference;
+ typedef Category iterator_category;
+ };
+# else
+
+ // declare iterator_base in namespace detail to work around MSVC bugs which
+ // prevent derivation from an identically-named class in a different namespace.
+ namespace detail {
+ template <class Category, class T, class Distance, class Pointer, class Reference>
+# if !defined(BOOST_MSVC_STD_ITERATOR)
+ struct iterator_base : std::iterator<Category, T, Distance, Pointer, Reference> {};
+# else
+ struct iterator_base : std::iterator<Category, T, Distance>
+ {
+ typedef Reference reference;
+ typedef Pointer pointer;
+ typedef Distance difference_type;
+ };
+# endif
+ }
+
+ template <class Category, class T, class Distance = std::ptrdiff_t,
+ class Pointer = T*, class Reference = T&>
+ struct iterator : boost::detail::iterator_base<Category, T, Distance, Pointer, Reference> {};
+# endif
+} // namespace boost
+
+#endif // BOOST_ITERATOR_HPP