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_UNIQUED_IMPL_HPP |
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12 | #define BOOST_RANGE_ADAPTOR_UNIQUED_IMPL_HPP |
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13 | |
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14 | #include <boost/range/adaptor/adjacent_filtered.hpp> |
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15 | |
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16 | namespace boost |
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17 | { |
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18 | |
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19 | namespace range_detail |
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20 | { |
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21 | struct unique_forwarder { }; |
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22 | |
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23 | struct unique_not_equal_to |
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24 | { |
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25 | typedef bool result_type; |
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26 | |
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27 | template< class T > |
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28 | bool operator()( const T& l, const T& r ) const |
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29 | { |
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30 | return !(l == r); |
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31 | } |
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32 | }; |
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33 | |
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34 | template<class ForwardRng> |
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35 | class unique_range : public adjacent_filter_range<unique_not_equal_to, ForwardRng, true> |
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36 | { |
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37 | typedef adjacent_filter_range<unique_not_equal_to, ForwardRng, true> base; |
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38 | public: |
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39 | explicit unique_range(ForwardRng& rng) |
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40 | : base(unique_not_equal_to(), rng) |
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41 | { |
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42 | } |
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43 | }; |
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44 | |
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45 | template< class ForwardRng > |
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46 | inline unique_range<ForwardRng> |
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47 | operator|( ForwardRng& r, |
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48 | unique_forwarder ) |
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49 | { |
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50 | return unique_range<ForwardRng>(r); |
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51 | } |
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52 | |
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53 | template< class ForwardRng > |
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54 | inline unique_range<const ForwardRng> |
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55 | operator|( const ForwardRng& r, |
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56 | unique_forwarder ) |
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57 | { |
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58 | return unique_range<const ForwardRng>(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::unique_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::unique_forwarder uniqued = |
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70 | range_detail::unique_forwarder(); |
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71 | } |
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72 | |
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73 | template<class ForwardRange> |
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74 | inline unique_range<ForwardRange> |
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75 | unique(ForwardRange& rng) |
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76 | { |
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77 | return unique_range<ForwardRange>(rng); |
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78 | } |
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79 | |
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80 | template<class ForwardRange> |
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81 | inline unique_range<const ForwardRange> |
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82 | unique(const ForwardRange& rng) |
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83 | { |
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84 | return unique_range<const ForwardRange>(rng); |
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85 | } |
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86 | } // 'adaptors' |
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87 | |
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88 | } |
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89 | |
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90 | #endif |
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