| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #pragma once | ||
| 2 | |||
| 3 | #include "../Common.h" | ||
| 4 | #include "../util/TraitImpl.h" | ||
| 5 | |||
| 6 | namespace CXXIter { | ||
| 7 | |||
| 8 | // ################################################################################################ | ||
| 9 | // FILTER | ||
| 10 | // ################################################################################################ | ||
| 11 | namespace op { | ||
| 12 | /** @private */ | ||
| 13 | template<typename TChainInput, typename TFilterFn> | ||
| 14 | class [[nodiscard(CXXITER_CHAINER_NODISCARD_WARNING)]] Filter : public IterApi<Filter<TChainInput, TFilterFn>> { | ||
| 15 | friend struct trait::Iterator<Filter<TChainInput, TFilterFn>>; | ||
| 16 | friend struct trait::DoubleEndedIterator<Filter<TChainInput, TFilterFn>>; | ||
| 17 | private: | ||
| 18 | using InputItem = typename TChainInput::Item; | ||
| 19 | |||
| 20 | TChainInput input; | ||
| 21 | TFilterFn filterFn; | ||
| 22 | public: | ||
| 23 | 104 | constexpr Filter(TChainInput&& input, TFilterFn filterFn) : input(std::move(input)), filterFn(filterFn) {} | |
| 24 | }; | ||
| 25 | } | ||
| 26 | // ------------------------------------------------------------------------------------------------ | ||
| 27 | /** @private */ | ||
| 28 | template<typename TChainInput, typename TFilterFn> | ||
| 29 | struct trait::Iterator<op::Filter<TChainInput, TFilterFn>> { | ||
| 30 | using ChainInputIterator = trait::Iterator<TChainInput>; | ||
| 31 | // CXXIter Interface | ||
| 32 | using Self = op::Filter<TChainInput, TFilterFn>; | ||
| 33 | using Item = typename ChainInputIterator::Item; | ||
| 34 | |||
| 35 | 291 | static constexpr inline IterValue<Item> next(Self& self) { | |
| 36 |
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110 | while(true) { |
| 37 |
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291 | auto item = ChainInputIterator::next(self.input); |
| 38 |
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431 | if(!item.has_value()) [[unlikely]] { return {}; } |
| 39 |
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246 | if(self.filterFn(item.value())) { return item; } |
| 40 | } | ||
| 41 | } | ||
| 42 | 54 | static constexpr inline SizeHint sizeHint(const Self& self) { | |
| 43 |
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54 | SizeHint input = ChainInputIterator::sizeHint(self.input); |
| 44 | 106 | return SizeHint(0, input.upperBound); | |
| 45 | } | ||
| 46 | 4 | static constexpr inline size_t advanceBy(Self& self, size_t n) { return util::advanceByPull(self, n); } | |
| 47 | }; | ||
| 48 | /** @private */ | ||
| 49 | template<CXXIterDoubleEndedIterator TChainInput, typename TFilterFn> | ||
| 50 | struct trait::DoubleEndedIterator<op::Filter<TChainInput, TFilterFn>> { | ||
| 51 | using ChainInputIterator = trait::DoubleEndedIterator<TChainInput>; | ||
| 52 | // CXXIter Interface | ||
| 53 | using Self = op::Filter<TChainInput, TFilterFn>; | ||
| 54 | using Item = typename ChainInputIterator::Item; | ||
| 55 | |||
| 56 | 10 | static constexpr inline IterValue<Item> nextBack(Self& self) { | |
| 57 | 3 | while(true) { | |
| 58 | 10 | auto item = ChainInputIterator::nextBack(self.input); | |
| 59 | 15 | if(!item.has_value()) [[unlikely]] { return {}; } | |
| 60 | 8 | if(self.filterFn(item.value())) { return item; } | |
| 61 | } | ||
| 62 | } | ||
| 63 | }; | ||
| 64 | |||
| 65 | } | ||
| 66 |