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      1 // Copyright David Abrahams 2003.
      2 // Distributed under the Boost Software License, Version 1.0. (See
      3 // accompanying file LICENSE_1_0.txt or copy at
      4 // http://www.boost.org/LICENSE_1_0.txt)
      5 #ifndef ITERATOR_TRAITS_DWA200347_HPP
      6 # define ITERATOR_TRAITS_DWA200347_HPP
      7 
      8 # include <boost/detail/iterator.hpp>
      9 # include <boost/detail/workaround.hpp>
     10 
     11 namespace boost {
     12 
     13 // Unfortunately, g++ 2.95.x chokes when we define a class template
     14 // iterator_category which has the same name as its
     15 // std::iterator_category() function, probably due in part to the
     16 // "std:: is visible globally" hack it uses.  Use
     17 // BOOST_ITERATOR_CATEGORY to write code that's portable to older
     18 // GCCs.
     19 
     20 # if BOOST_WORKAROUND(__GNUC__, <= 2)
     21 #  define BOOST_ITERATOR_CATEGORY iterator_category_
     22 # else
     23 #  define BOOST_ITERATOR_CATEGORY iterator_category
     24 # endif
     25 
     26 
     27 template <class Iterator>
     28 struct iterator_value
     29 {
     30     typedef typename boost::detail::iterator_traits<Iterator>::value_type type;
     31 };
     32 
     33 template <class Iterator>
     34 struct iterator_reference
     35 {
     36     typedef typename boost::detail::iterator_traits<Iterator>::reference type;
     37 };
     38 
     39 
     40 template <class Iterator>
     41 struct iterator_pointer
     42 {
     43     typedef typename boost::detail::iterator_traits<Iterator>::pointer type;
     44 };
     45 
     46 template <class Iterator>
     47 struct iterator_difference
     48 {
     49     typedef typename boost::detail::iterator_traits<Iterator>::difference_type type;
     50 };
     51 
     52 template <class Iterator>
     53 struct BOOST_ITERATOR_CATEGORY
     54 {
     55     typedef typename boost::detail::iterator_traits<Iterator>::iterator_category type;
     56 };
     57 
     58 # if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
     59 template <>
     60 struct iterator_value<int>
     61 {
     62     typedef void type;
     63 };
     64 
     65 template <>
     66 struct iterator_reference<int>
     67 {
     68     typedef void type;
     69 };
     70 
     71 template <>
     72 struct iterator_pointer<int>
     73 {
     74     typedef void type;
     75 };
     76 
     77 template <>
     78 struct iterator_difference<int>
     79 {
     80     typedef void type;
     81 };
     82 
     83 template <>
     84 struct BOOST_ITERATOR_CATEGORY<int>
     85 {
     86     typedef void type;
     87 };
     88 # endif
     89 
     90 } // namespace boost::iterator
     91 
     92 #endif // ITERATOR_TRAITS_DWA200347_HPP
     93