source: NonGTP/Boost/boost/iterator.hpp @ 857

Revision 857, 2.0 KB checked in by igarcia, 19 years ago (diff)
Line 
1//  interator.hpp workarounds for non-conforming standard libraries  ---------//
2
3//  (C) Copyright Beman Dawes 2000. Distributed under the Boost
4//  Software License, Version 1.0. (See accompanying file
5//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7//  See http://www.boost.org/libs/utility for documentation.
8
9//  Revision History
10//  12 Jan 01 added <cstddef> for std::ptrdiff_t (Jens Maurer)
11//  28 Jun 00 Workarounds to deal with known MSVC bugs (David Abrahams)
12//  26 Jun 00 Initial version (Jeremy Siek)
13
14#ifndef BOOST_ITERATOR_HPP
15#define BOOST_ITERATOR_HPP
16
17#include <iterator>
18#include <cstddef>           // std::ptrdiff_t
19#include <boost/config.hpp>
20
21namespace boost
22{
23# if defined(BOOST_NO_STD_ITERATOR) && !defined(BOOST_MSVC_STD_ITERATOR)
24  template <class Category, class T,
25    class Distance = std::ptrdiff_t,
26    class Pointer = T*, class Reference = T&>
27  struct iterator
28  {
29    typedef T         value_type;
30    typedef Distance  difference_type;
31    typedef Pointer   pointer;
32    typedef Reference reference;
33    typedef Category  iterator_category;
34  };
35# else
36
37  // declare iterator_base in namespace detail to work around MSVC bugs which
38  // prevent derivation from an identically-named class in a different namespace.
39  namespace detail {
40   template <class Category, class T, class Distance, class Pointer, class Reference>
41#  if !defined(BOOST_MSVC_STD_ITERATOR)
42   struct iterator_base : std::iterator<Category, T, Distance, Pointer, Reference> {};
43#  else
44   struct iterator_base : std::iterator<Category, T, Distance>
45   {
46     typedef Reference reference;
47     typedef Pointer pointer;
48     typedef Distance difference_type;
49   };
50#  endif
51  }
52
53  template <class Category, class T, class Distance = std::ptrdiff_t,
54            class Pointer = T*, class Reference = T&>
55   struct iterator : detail::iterator_base<Category, T, Distance, Pointer, Reference> {};
56# endif
57} // namespace boost
58
59#endif // BOOST_ITERATOR_HPP
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