Move from boost-sanbox [ JDG ]

[SVN r18958]

include/boost/iterator/reverse_iterator.hpp

@@ -0,0 +1,71 @@
+// (C) Copyright David Abrahams 2002.
+// (C) Copyright Jeremy Siek    2002.
+// (C) Copyright Thomas Witt    2002.
+// Permission to copy, use, modify,
+// sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+#ifndef BOOST_REVERSE_ITERATOR_23022003THW_HPP
+#define BOOST_REVERSE_ITERATOR_23022003THW_HPP
+
+#include <boost/iterator.hpp>
+#include <boost/utility.hpp>
+#include <boost/iterator/iterator_adaptor.hpp>
+
+namespace boost
+{
+
+  //
+  //
+  //
+  template <class Iterator>
+  class reverse_iterator
+      : public iterator_adaptor< reverse_iterator<Iterator>, Iterator >
+  {
+      typedef iterator_adaptor< reverse_iterator<Iterator>, Iterator > super_t;
+
+      friend class iterator_core_access;
+
+   public:
+      reverse_iterator() {}
+
+      explicit reverse_iterator(Iterator x) 
+          : super_t(x) {}
+
+      template<class OtherIterator>
+      reverse_iterator(
+          reverse_iterator<OtherIterator> const& r
+          , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0
+          )
+          : super_t(r.base())
+      {}
+
+   private:
+      typename super_t::reference dereference() const { return *boost::prior(this->base()); }
+    
+      void increment() { --this->base_reference(); }
+      void decrement() { ++this->base_reference(); }
+
+      void advance(typename super_t::difference_type n)
+      {
+          this->base_reference() += -n;
+      }
+
+      template <class OtherIterator>
+      typename super_t::difference_type
+      distance_to(reverse_iterator<OtherIterator> const& y) const
+      {
+          return this->base_reference() - y.base();
+      }
+  };
+
+  template <class BidirectionalIterator>
+  reverse_iterator<BidirectionalIterator> make_reverse_iterator(BidirectionalIterator x)
+  {
+      return reverse_iterator<BidirectionalIterator>(x);
+  }
+
+} // namespace boost
+
+#endif // BOOST_REVERSE_ITERATOR_23022003THW_HPP