Fixed PDF format as article

Added iterator_traits docs


[SVN r22043]

doc/iterator_traits.rst

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++++++++++++++++++
+ Iterator Traits
++++++++++++++++++
+
+:Author: David Abrahams
+:Contact: dave@boost-consulting.com
+:organization: `Boost Consulting`_
+:date: $Date$
+:copyright: Copyright David Abrahams 2004. All rights reserved
+
+.. _`Boost Consulting`: http://www.boost-consulting.com
+
+:abstract: Header ``<boost/iterator/iterator_traits.hpp>`` provides
+  the ability to access an iterator's associated types using
+  MPL-compatible metafunctions_.
+
+.. _metafunctions: ../../mpl/doc/index.html#metafunctions
+
+Overview
+========
+
+``std::iterator_traits`` provides access to five associated types
+of any iterator: its ``value_type``, ``reference``, ``pointer``,
+``iterator_category``, and ``difference_type``.  Unfortunately,
+such a "multi-valued" traits template can be difficult to use in a
+metaprogramming context.  ``<boost/iterator/iterator_traits.hpp>``
+provides access to these types using a standard metafunctions_.
+
+Summary
+=======
+
+Header ``<boost/iterator/iterator_traits.hpp>``::
+
+  template <class Iterator>
+  struct iterator_value
+  {
+      typedef typename 
+        std::iterator_traits<Iterator>::value_type 
+      type;
+  };
+
+  template <class Iterator>
+  struct iterator_reference
+  {
+      typedef typename 
+        std::iterator_traits<Iterator>::reference
+      type;
+  };
+
+
+  template <class Iterator>
+  struct iterator_pointer
+  {
+      typedef typename 
+        std::iterator_traits<Iterator>::pointer 
+      type;
+  };
+
+  template <class Iterator>
+  struct iterator_difference
+  {
+      typedef typename
+        detail::iterator_traits<Iterator>::difference_type
+      type;
+  };
+
+  template <class Iterator>
+  struct iterator_category
+  {
+      typedef typename
+        detail::iterator_traits<Iterator>::iterator_category
+      type;
+  };
+
+Broken Compiler Notes
+=====================
+
+Because of workarounds in Boost, you may find that these
+metafunctions_ actually work better than the facilities provided by
+your compiler's standard library.
+
+On compilers that don't support partial specialization, such as
+Microsoft Visual C++ 6.0 or 7.0, you may need to manually invoke
+BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION_ on the
+``value_type`` of pointers that are passed to these metafunctions.
+
+Because of bugs in the implementation of GCC-2.9x, the name of
+``iterator_category`` is changed to ``iterator_category_`` on that
+compiler.  A macro, ``BOOST_ITERATOR_CATEGORY``, that expands to
+either ``iterator_category`` or ``iterator_category_``, as
+appropriate to the platform, is provided for portability.
+
+.. _BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION: ../../type_traits/index.html#transformations
+