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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