1 | // Boost.Range library |
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2 | // |
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3 | // Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. Use, modification and |
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4 | // distribution is subject to the Boost Software License, Version |
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5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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6 | // http://www.boost.org/LICENSE_1_0.txt) |
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7 | // |
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8 | // For more information, see http://www.boost.org/libs/range/ |
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9 | // |
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10 | |
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11 | #ifndef BOOST_RANGE_ADAPTOR_REVERSED_HPP |
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12 | #define BOOST_RANGE_ADAPTOR_REVERSED_HPP |
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13 | |
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14 | #include <boost/range/iterator_range.hpp> |
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15 | #include <boost/iterator/reverse_iterator.hpp> |
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16 | |
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17 | namespace boost |
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18 | { |
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19 | namespace range_detail |
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20 | { |
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21 | template< class R > |
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22 | struct reverse_range : |
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23 | public boost::iterator_range< |
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24 | boost::reverse_iterator< |
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25 | BOOST_DEDUCED_TYPENAME range_iterator<R>::type |
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26 | > |
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27 | > |
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28 | { |
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29 | private: |
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30 | typedef boost::iterator_range< |
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31 | boost::reverse_iterator< |
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32 | BOOST_DEDUCED_TYPENAME range_iterator<R>::type |
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33 | > |
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34 | > |
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35 | base; |
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36 | |
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37 | public: |
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38 | typedef boost::reverse_iterator<BOOST_DEDUCED_TYPENAME range_iterator<R>::type> iterator; |
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39 | |
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40 | reverse_range( R& r ) |
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41 | : base( iterator(boost::end(r)), iterator(boost::begin(r)) ) |
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42 | { } |
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43 | }; |
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44 | |
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45 | struct reverse_forwarder {}; |
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46 | |
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47 | template< class BidirectionalRng > |
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48 | inline reverse_range<BidirectionalRng> |
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49 | operator|( BidirectionalRng& r, reverse_forwarder ) |
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50 | { |
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51 | return reverse_range<BidirectionalRng>( r ); |
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52 | } |
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53 | |
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54 | template< class BidirectionalRng > |
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55 | inline reverse_range<const BidirectionalRng> |
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56 | operator|( const BidirectionalRng& r, reverse_forwarder ) |
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57 | { |
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58 | return reverse_range<const BidirectionalRng>( r ); |
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59 | } |
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60 | |
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61 | } // 'range_detail' |
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62 | |
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63 | using range_detail::reverse_range; |
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64 | |
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65 | namespace adaptors |
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66 | { |
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67 | namespace |
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68 | { |
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69 | const range_detail::reverse_forwarder reversed = |
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70 | range_detail::reverse_forwarder(); |
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71 | } |
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72 | |
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73 | template<class BidirectionalRange> |
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74 | inline reverse_range<BidirectionalRange> |
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75 | reverse(BidirectionalRange& rng) |
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76 | { |
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77 | return reverse_range<BidirectionalRange>(rng); |
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78 | } |
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79 | |
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80 | template<class BidirectionalRange> |
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81 | inline reverse_range<const BidirectionalRange> |
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82 | reverse(const BidirectionalRange& rng) |
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83 | { |
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84 | return reverse_range<const BidirectionalRange>(rng); |
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85 | } |
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86 | } // 'adaptors' |
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87 | |
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88 | } // 'boost' |
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89 | |
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90 | #endif |
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