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| 2 | #ifndef BOOST_MPL_ZIP_VIEW_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_ZIP_VIEW_HPP_INCLUDED |
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| 4 | |
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| 5 | // Copyright Aleksey Gurtovoy 2000-2002 |
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| 6 | // Copyright David Abrahams 2000-2002 |
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| 7 | // |
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| 8 | // Distributed under the Boost Software License, Version 1.0. |
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| 9 | // (See accompanying file LICENSE_1_0.txt or copy at |
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| 10 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 11 | // |
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| 12 | // See http://www.boost.org/libs/mpl for documentation. |
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| 13 | |
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| 14 | // $Source: /cvsroot/boost/boost/boost/mpl/zip_view.hpp,v $ |
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| 15 | // $Date: 2004/09/02 15:40:42 $ |
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| 16 | // $Revision: 1.3 $ |
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| 17 | |
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| 18 | #include <boost/mpl/transform.hpp> |
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| 19 | #include <boost/mpl/begin_end.hpp> |
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| 20 | #include <boost/mpl/iterator_tags.hpp> |
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| 21 | #include <boost/mpl/next.hpp> |
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| 22 | #include <boost/mpl/lambda.hpp> |
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| 23 | #include <boost/mpl/deref.hpp> |
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| 24 | #include <boost/mpl/aux_/na_spec.hpp> |
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| 25 | |
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| 26 | namespace boost { namespace mpl { |
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| 27 | |
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| 28 | template< typename IteratorSeq > |
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| 29 | struct zip_iterator |
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| 30 | { |
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| 31 | typedef forward_iterator_tag category; |
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| 32 | typedef typename transform1< |
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| 33 | IteratorSeq |
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| 34 | , deref<_1> |
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| 35 | >::type type; |
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| 36 | |
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| 37 | typedef zip_iterator< |
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| 38 | typename transform1< |
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| 39 | IteratorSeq |
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| 40 | , next<_1> |
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| 41 | >::type |
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| 42 | > next; |
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| 43 | }; |
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| 44 | |
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| 45 | template< |
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| 46 | typename BOOST_MPL_AUX_NA_PARAM(Sequences) |
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| 47 | > |
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| 48 | struct zip_view |
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| 49 | { |
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| 50 | private: |
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| 51 | typedef typename transform1< Sequences, begin<_1> >::type first_ones_; |
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| 52 | typedef typename transform1< Sequences, end<_1> >::type last_ones_; |
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| 53 | |
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| 54 | public: |
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| 55 | typedef nested_begin_end_tag tag; |
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| 56 | typedef zip_iterator<first_ones_> begin; |
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| 57 | typedef zip_iterator<last_ones_> end; |
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| 58 | }; |
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| 59 | |
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| 60 | BOOST_MPL_AUX_NA_SPEC(1, zip_view) |
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| 61 | |
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| 62 | }} |
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| 63 | |
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| 64 | #endif // BOOST_MPL_ZIP_VIEW_HPP_INCLUDED |
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