1 2 #ifndef BOOST_MPL_ZIP_VIEW_HPP_INCLUDED 3 #define BOOST_MPL_ZIP_VIEW_HPP_INCLUDED 4 5 // Copyright Aleksey Gurtovoy 2000-2010 6 // Copyright David Abrahams 2000-2002 7 // 8 // Distributed under the Boost Software License, Version 1.0. 9 // (See accompanying file LICENSE_1_0.txt or copy at 10 // http://www.boost.org/LICENSE_1_0.txt) 11 // 12 // See http://www.boost.org/libs/mpl for documentation. 13 14 // $Id$ 15 // $Date$ 16 // $Revision$ 17 18 #include <boost/mpl/transform.hpp> 19 #include <boost/mpl/begin_end.hpp> 20 #include <boost/mpl/iterator_tags.hpp> 21 #include <boost/mpl/next.hpp> 22 #include <boost/mpl/lambda.hpp> 23 #include <boost/mpl/deref.hpp> 24 #include <boost/mpl/aux_/na_spec.hpp> 25 26 namespace boost { namespace mpl { 27 28 template< typename IteratorSeq > 29 struct zip_iterator 30 { 31 typedef forward_iterator_tag category; 32 typedef typename transform1< 33 IteratorSeq 34 , deref<_1> 35 >::type type; 36 37 typedef zip_iterator< 38 typename transform1< 39 IteratorSeq 40 , mpl::next<_1> 41 >::type 42 > next; 43 }; 44 45 template< 46 typename BOOST_MPL_AUX_NA_PARAM(Sequences) 47 > 48 struct zip_view 49 { 50 private: 51 typedef typename transform1< Sequences, mpl::begin<_1> >::type first_ones_; 52 typedef typename transform1< Sequences, mpl::end<_1> >::type last_ones_; 53 54 public: 55 typedef nested_begin_end_tag tag; 56 typedef zip_view type; 57 typedef zip_iterator<first_ones_> begin; 58 typedef zip_iterator<last_ones_> end; 59 }; 60 61 BOOST_MPL_AUX_NA_SPEC(1, zip_view) 62 63 }} 64 65 #endif // BOOST_MPL_ZIP_VIEW_HPP_INCLUDED 66