| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #pragma once | ||
| 2 | |||
| 3 | #include <cstdlib> | ||
| 4 | #include <optional> | ||
| 5 | |||
| 6 | #include "../Common.h" | ||
| 7 | #include "../sources/ContainerSources.h" | ||
| 8 | #include "../util/TraitImpl.h" | ||
| 9 | |||
| 10 | namespace CXXIter { | ||
| 11 | |||
| 12 | // ################################################################################################ | ||
| 13 | // SORTER | ||
| 14 | // ################################################################################################ | ||
| 15 | namespace op { | ||
| 16 | /** @private */ | ||
| 17 | template<typename TChainInput> | ||
| 18 | class [[nodiscard(CXXITER_CHAINER_NODISCARD_WARNING)]] Reverse : public IterApi<Reverse<TChainInput>> { | ||
| 19 | friend struct trait::Iterator<Reverse<TChainInput>>; | ||
| 20 | friend struct trait::DoubleEndedIterator<Reverse<TChainInput>>; | ||
| 21 | friend struct trait::ExactSizeIterator<Reverse<TChainInput>>; | ||
| 22 | |||
| 23 | using InputItem = typename TChainInput::Item; | ||
| 24 | |||
| 25 | struct NoReverseCache {}; | ||
| 26 | using ReverseCacheContainer = std::conditional_t< | ||
| 27 | std::is_reference_v<InputItem>, | ||
| 28 | std::vector<std::reference_wrapper<InputItem>>, | ||
| 29 | std::vector<InputItem>>; | ||
| 30 | using ReverseCache = SrcMov<ReverseCacheContainer>; | ||
| 31 | |||
| 32 | private: | ||
| 33 | // If the underlying iterator pipeline is double-ended, we don't need to use the reverseCache | ||
| 34 | static constexpr bool USE_CACHE = !CXXIterDoubleEndedIterator<TChainInput>; | ||
| 35 | TChainInput input; | ||
| 36 | std::conditional_t<USE_CACHE, std::optional<ReverseCache>, NoReverseCache> reverseCache; | ||
| 37 | |||
| 38 | public: | ||
| 39 | 14 | constexpr Reverse(TChainInput&& input) : input(std::move(input)) {} | |
| 40 | }; | ||
| 41 | } | ||
| 42 | // ------------------------------------------------------------------------------------------------ | ||
| 43 | /** @private */ | ||
| 44 | template<typename TChainInput> | ||
| 45 | struct trait::Iterator<op::Reverse<TChainInput>> { | ||
| 46 | using ChainInputIterator = trait::Iterator<TChainInput>; | ||
| 47 | using InputItem = typename TChainInput::Item; | ||
| 48 | // CXXIter Interface | ||
| 49 | using Self = op::Reverse<TChainInput>; | ||
| 50 | using Item = InputItem; | ||
| 51 | |||
| 52 | 6 | static void initReverseCache(Self& self) { | |
| 53 | // drain input iterator into reverse cache | ||
| 54 | 6 | typename Self::ReverseCacheContainer reverseCache; | |
| 55 |
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6 | reverseCache.reserve(self.input.sizeHint().expectedResultSize()); |
| 56 |
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66 | while(true) { |
| 57 |
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36 | auto item = ChainInputIterator::next(self.input); |
| 58 |
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36 | if(!item.has_value()) { break; } |
| 59 |
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30 | reverseCache.push_back(std::move(item.value())); |
| 60 | } | ||
| 61 |
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6 | self.reverseCache = typename Self::ReverseCache(std::move(reverseCache)); |
| 62 | 6 | } | |
| 63 | |||
| 64 | 80 | static constexpr inline IterValue<Item> next(Self& self) { | |
| 65 | if constexpr(Self::USE_CACHE) { | ||
| 66 |
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36 | if(!self.reverseCache.has_value()) [[unlikely]] { initReverseCache(self); } |
| 67 | 36 | return trait::DoubleEndedIterator<typename Self::ReverseCache>::nextBack(self.reverseCache.value()); | |
| 68 | } else { | ||
| 69 | 44 | return trait::DoubleEndedIterator<TChainInput>::nextBack(self.input); | |
| 70 | } | ||
| 71 | } | ||
| 72 | 16 | static constexpr inline SizeHint sizeHint(const Self& self) { return ChainInputIterator::sizeHint(self.input); } | |
| 73 | static constexpr inline size_t advanceBy(Self& self, size_t n) { return util::advanceByPullBack(self, n); } | ||
| 74 | }; | ||
| 75 | /** @private */ | ||
| 76 | template<CXXIterDoubleEndedIterator TChainInput> | ||
| 77 | struct trait::DoubleEndedIterator<op::Reverse<TChainInput>> { | ||
| 78 | using ChainInputIterator = trait::Iterator<TChainInput>; | ||
| 79 | using InputItem = typename TChainInput::Item; | ||
| 80 | // CXXIter Interface | ||
| 81 | using Self = op::Reverse<TChainInput>; | ||
| 82 | using Item = InputItem; | ||
| 83 | |||
| 84 | 11 | static constexpr inline IterValue<Item> nextBack(Self& self) { | |
| 85 | if constexpr(Self::USE_CACHE) { | ||
| 86 | if(!self.reverseCache.has_value()) [[unlikely]] { initReverseCache(self); } | ||
| 87 | return trait::Iterator<typename Self::ReverseCache>::next(self.reverseCache.value()); | ||
| 88 | } else { | ||
| 89 | 11 | return ChainInputIterator::next(self.input); | |
| 90 | } | ||
| 91 | } | ||
| 92 | }; | ||
| 93 | /** @private */ | ||
| 94 | template<CXXIterExactSizeIterator TChainInput> | ||
| 95 | struct trait::ExactSizeIterator<op::Reverse<TChainInput>> { | ||
| 96 | static constexpr inline size_t size(const op::Reverse<TChainInput>& self) { | ||
| 97 | return trait::ExactSizeIterator<TChainInput>::size(self.input); | ||
| 98 | } | ||
| 99 | }; | ||
| 100 | |||
| 101 | } | ||
| 102 |