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