sl@0: //  interator.hpp workarounds for non-conforming standard libraries  ---------//
sl@0: 
sl@0: //  (C) Copyright Beman Dawes 2000. Distributed under the Boost
sl@0: //  Software License, Version 1.0. (See accompanying file
sl@0: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
sl@0: 
sl@0: //  See http://www.boost.org/libs/utility for documentation.
sl@0: 
sl@0: //  Revision History
sl@0: //  12 Jan 01 added <cstddef> for std::ptrdiff_t (Jens Maurer)
sl@0: //  28 Jun 00 Workarounds to deal with known MSVC bugs (David Abrahams)
sl@0: //  26 Jun 00 Initial version (Jeremy Siek)
sl@0: 
sl@0: #ifndef BOOST_ITERATOR_HPP
sl@0: #define BOOST_ITERATOR_HPP
sl@0: 
sl@0: #include <iterator>
sl@0: #include <cstddef>           // std::ptrdiff_t
sl@0: #include <boost/config.hpp>
sl@0: 
sl@0: namespace boost
sl@0: {
sl@0: # if defined(BOOST_NO_STD_ITERATOR) && !defined(BOOST_MSVC_STD_ITERATOR)
sl@0:   template <class Category, class T,
sl@0:     class Distance = std::ptrdiff_t,
sl@0:     class Pointer = T*, class Reference = T&>
sl@0:   struct iterator
sl@0:   {
sl@0:     typedef T         value_type;
sl@0:     typedef Distance  difference_type;
sl@0:     typedef Pointer   pointer;
sl@0:     typedef Reference reference;
sl@0:     typedef Category  iterator_category;
sl@0:   };
sl@0: # else
sl@0: 
sl@0:   // declare iterator_base in namespace detail to work around MSVC bugs which
sl@0:   // prevent derivation from an identically-named class in a different namespace.
sl@0:   namespace detail {
sl@0:    template <class Category, class T, class Distance, class Pointer, class Reference>
sl@0: #  if !defined(BOOST_MSVC_STD_ITERATOR)
sl@0:    struct iterator_base : std::iterator<Category, T, Distance, Pointer, Reference> {};
sl@0: #  else
sl@0:    struct iterator_base : std::iterator<Category, T, Distance>
sl@0:    {
sl@0:      typedef Reference reference;
sl@0:      typedef Pointer pointer;
sl@0:      typedef Distance difference_type;
sl@0:    };
sl@0: #  endif
sl@0:   }
sl@0: 
sl@0:   template <class Category, class T, class Distance = std::ptrdiff_t,
sl@0:             class Pointer = T*, class Reference = T&>
sl@0:   struct iterator : boost::detail::iterator_base<Category, T, Distance, Pointer, Reference> {};
sl@0: # endif
sl@0: } // namespace boost
sl@0: 
sl@0: #endif // BOOST_ITERATOR_HPP