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