| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #pragma once | ||
| 2 | |||
| 3 | #ifdef CXXITER_HAS_COROUTINE | ||
| 4 | |||
| 5 | #include "../Common.h" | ||
| 6 | #include "../Generator.h" | ||
| 7 | #include "../util/TraitImpl.h" | ||
| 8 | |||
| 9 | namespace CXXIter { | ||
| 10 | |||
| 11 | // ################################################################################################ | ||
| 12 | // GENERATE FROM | ||
| 13 | // ################################################################################################ | ||
| 14 | |||
| 15 | template<typename T, typename TItem> | ||
| 16 | concept GeneratorFromFunction = (util::invocable_byvalue<T, TItem> && util::is_template_instance_v<std::invoke_result_t<T, TItem>, Generator>); | ||
| 17 | |||
| 18 | namespace op { | ||
| 19 | /** @private */ | ||
| 20 | template<typename TChainInput, typename TGeneratorFn, typename TGenerator> | ||
| 21 | class [[nodiscard(CXXITER_CHAINER_NODISCARD_WARNING)]] GenerateFrom : public IterApi<GenerateFrom<TChainInput, TGeneratorFn, TGenerator>> { | ||
| 22 | friend struct trait::Iterator<GenerateFrom<TChainInput, TGeneratorFn, TGenerator>>; | ||
| 23 | friend struct trait::ExactSizeIterator<GenerateFrom<TChainInput, TGeneratorFn, TGenerator>>; | ||
| 24 | private: | ||
| 25 | TChainInput input; | ||
| 26 | TGeneratorFn generatorFn; | ||
| 27 | std::optional<TGenerator> currentGenerator; | ||
| 28 | public: | ||
| 29 | 14 | constexpr GenerateFrom(TChainInput&& input, TGeneratorFn& generatorFn) : input(std::move(input)), generatorFn(generatorFn) {} | |
| 30 | }; | ||
| 31 | } | ||
| 32 | // ------------------------------------------------------------------------------------------------ | ||
| 33 | /** @private */ | ||
| 34 | template<typename TChainInput, typename TGeneratorFn, typename TGenerator> | ||
| 35 | struct trait::Iterator<op::GenerateFrom<TChainInput, TGeneratorFn, TGenerator>> { | ||
| 36 | using ChainInputIterator = trait::Iterator<TChainInput>; | ||
| 37 | using InputItem = typename TChainInput::Item; | ||
| 38 | using InputItemOwned = typename TChainInput::ItemOwned; | ||
| 39 | // CXXIter Interface | ||
| 40 | using Self = op::GenerateFrom<TChainInput, TGeneratorFn, TGenerator>; | ||
| 41 | using Item = typename TGenerator::value_type; | ||
| 42 | |||
| 43 | 120 | static constexpr inline IterValue<Item> next(Self& self) { | |
| 44 |
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72 | while(true) { |
| 45 |
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120 | if(!self.currentGenerator.has_value()) { |
| 46 |
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42 | auto item = ChainInputIterator::next(self.input); |
| 47 |
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42 | if(!item.has_value()) { return {}; } // reached end |
| 48 |
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30 | self.currentGenerator.emplace(self.generatorFn( std::forward<InputItem>(item.value()) )); |
| 49 | } | ||
| 50 | |||
| 51 |
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108 | auto item = self.currentGenerator.value().next(); |
| 52 |
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106 | if(!item.has_value()) { |
| 53 | 28 | self.currentGenerator.reset(); | |
| 54 | 28 | continue; | |
| 55 | } | ||
| 56 | 78 | return item; | |
| 57 | } | ||
| 58 | } | ||
| 59 | 14 | static constexpr inline SizeHint sizeHint(const Self& self) { return ChainInputIterator::sizeHint(self.input); } | |
| 60 | static constexpr inline size_t advanceBy(Self& self, size_t n) { return util::advanceByPull(self, n); } | ||
| 61 | }; | ||
| 62 | |||
| 63 | } | ||
| 64 | |||
| 65 | #endif | ||
| 66 |