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