[1022] | 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_TRANSFORMED_HPP |
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| 12 | #define BOOST_RANGE_ADAPTOR_TRANSFORMED_HPP |
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| 13 | |
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| 14 | #include <boost/range/adaptor/argument_fwd.hpp> |
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| 15 | #include <boost/range/iterator_range.hpp> |
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| 16 | #include <boost/iterator/transform_iterator.hpp> |
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| 17 | |
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| 18 | namespace boost |
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| 19 | { |
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| 20 | namespace range_detail |
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| 21 | { |
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| 22 | |
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| 23 | template< class F, class R > |
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| 24 | struct transform_range : |
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| 25 | public boost::iterator_range< |
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| 26 | boost::transform_iterator< F, |
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| 27 | BOOST_DEDUCED_TYPENAME range_iterator<R>::type |
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| 28 | > |
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| 29 | > |
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| 30 | { |
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| 31 | private: |
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| 32 | typedef boost::iterator_range< |
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| 33 | boost::transform_iterator< F, |
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| 34 | BOOST_DEDUCED_TYPENAME range_iterator<R>::type |
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| 35 | > |
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| 36 | > |
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| 37 | base; |
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| 38 | |
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| 39 | public: |
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| 40 | typedef F transform_fn_type; |
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| 41 | typedef R source_range_type; |
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| 42 | |
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| 43 | transform_range( F f, R& r ) |
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| 44 | : base( make_transform_iterator( boost::begin(r), f ), |
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| 45 | make_transform_iterator( boost::end(r), f ) ) |
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| 46 | |
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| 47 | { } |
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| 48 | }; |
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| 49 | |
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| 50 | template< class T > |
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| 51 | struct transform_holder : holder<T> |
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| 52 | { |
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| 53 | transform_holder( T r ) : holder<T>(r) |
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| 54 | { } |
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| 55 | }; |
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| 56 | |
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| 57 | template< class InputRng, class UnaryFunction > |
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| 58 | inline transform_range<UnaryFunction,InputRng> |
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| 59 | operator|( InputRng& r, |
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| 60 | const transform_holder<UnaryFunction>& f ) |
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| 61 | { |
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| 62 | return transform_range<UnaryFunction,InputRng>( f.val, r ); |
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| 63 | } |
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| 64 | |
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| 65 | template< class InputRng, class UnaryFunction > |
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| 66 | inline transform_range<UnaryFunction, const InputRng> |
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| 67 | operator|( const InputRng& r, |
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| 68 | const transform_holder<UnaryFunction>& f ) |
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| 69 | { |
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| 70 | return transform_range<UnaryFunction, const InputRng>( f.val, r ); |
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| 71 | } |
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| 72 | |
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| 73 | } // 'range_detail' |
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| 74 | |
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| 75 | using range_detail::transform_range; |
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| 76 | |
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| 77 | namespace adaptors |
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| 78 | { |
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| 79 | namespace |
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| 80 | { |
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| 81 | const range_detail::forwarder<range_detail::transform_holder> |
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| 82 | transformed = |
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| 83 | range_detail::forwarder<range_detail::transform_holder>(); |
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| 84 | } |
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| 85 | |
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| 86 | template<class UnaryFunction, class InputRange> |
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| 87 | inline transform_range<UnaryFunction, InputRange> |
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| 88 | transform(InputRange& rng, UnaryFunction fn) |
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| 89 | { |
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| 90 | return transform_range<UnaryFunction, InputRange>(fn, rng); |
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| 91 | } |
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| 92 | |
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| 93 | template<class UnaryFunction, class InputRange> |
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| 94 | inline transform_range<UnaryFunction, const InputRange> |
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| 95 | transform(const InputRange& rng, UnaryFunction fn) |
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| 96 | { |
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| 97 | return transform_range<UnaryFunction, const InputRange>(fn, rng); |
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| 98 | } |
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| 99 | } // 'adaptors' |
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| 100 | |
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| 101 | } |
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| 102 | |
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| 103 | #endif |
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