| Line | Branch | Decision | Exec | Source |
|---|---|---|---|---|
| 1 | /** | |||
| 2 | * @author Matthew Kennedy, (c) 2019 | |||
| 3 | * | |||
| 4 | * This lets us compose multiple functions in to a single function. If we have | |||
| 5 | * conversion functions F(x), G(x), and H(x), we can define a new function | |||
| 6 | * FuncChain<F, G, H> that will compute H(G(F(X))). F first, then G, then H. | |||
| 7 | */ | |||
| 8 | ||||
| 9 | #pragma once | |||
| 10 | ||||
| 11 | #include "sensor_converter_func.h" | |||
| 12 | ||||
| 13 | #include <type_traits> | |||
| 14 | #include <utility> | |||
| 15 | ||||
| 16 | namespace priv { | |||
| 17 | template <class... _Types> | |||
| 18 | class FuncChain; | |||
| 19 | ||||
| 20 | template <> | |||
| 21 | class FuncChain<> { | |||
| 22 | protected: | |||
| 23 | 9 | SensorResult convert(float input) const { | ||
| 24 | // Base case is the identity function | |||
| 25 | 9 | return input; | ||
| 26 | } | |||
| 27 | ||||
| 28 | ✗ | void showInfo(float testInputValue) const { | ||
| 29 | // base case does nothing | |||
| 30 | (void)testInputValue; | |||
| 31 | ✗ | } | ||
| 32 | }; | |||
| 33 | ||||
| 34 | template <typename TFirst, typename... TRest> | |||
| 35 | class FuncChain<TFirst, TRest...> : private FuncChain<TRest...> { | |||
| 36 | static_assert(std::is_base_of_v<SensorConverter, TFirst>, "Template parameters must inherit from SensorConverter"); | |||
| 37 | ||||
| 38 | private: | |||
| 39 | using TBase = FuncChain<TRest...>; | |||
| 40 | ||||
| 41 | public: | |||
| 42 | 20 | SensorResult convert(float input) const { | ||
| 43 | // Convert the current step | |||
| 44 | 20 | SensorResult currentStep = m_f.convert(input); | ||
| 45 | ||||
| 46 | // if it was valid, pass this result to the chain of (n-1) functions that remain | |||
| 47 |
9/22priv::FuncChain<SubOne>::convert(float) const:
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priv::FuncChain<Doubler, SubOne>::convert(float) const:
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priv::FuncChain<Doubler>::convert(float) const:
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priv::FuncChain<AddOne, Doubler, SubOne>::convert(float) const:
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priv::FuncChain<AddOne, Doubler>::convert(float) const:
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priv::FuncChain<AddOne>::convert(float) const:
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priv::FuncChain<MafFilter>::convert(float) const:
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priv::FuncChain<MafTable, MafFilter>::convert(float) const:
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priv::FuncChain<MafVoltageCheck, MafTable, MafFilter>::convert(float) const:
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priv::FuncChain<ThermistorFunc>::convert(float) const:
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priv::FuncChain<ResistanceFunc, ThermistorFunc>::convert(float) const:
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20 | if (currentStep.Valid) { | |
| 48 | 18 | return TBase::convert(currentStep.Value); | ||
| 49 | } else { | |||
| 50 | 2 | return SensorResult(currentStep.Code); | ||
| 51 | } | |||
| 52 | } | |||
| 53 | ||||
| 54 | // Get the element in the current level | |||
| 55 | template <class TGet> | |||
| 56 | 14 | std::enable_if_t<std::is_same_v<TGet, TFirst>, TGet &> get() { | ||
| 57 | 14 | return m_f; | ||
| 58 | } | |||
| 59 | ||||
| 60 | template <class TGet> | |||
| 61 | 5 | std::enable_if_t<std::is_same_v<TGet, TFirst>, TGet *> getPtr() { | ||
| 62 | 5 | return &m_f; | ||
| 63 | } | |||
| 64 | ||||
| 65 | // We don't have it - check level (n - 1) | |||
| 66 | template <class TGet> | |||
| 67 | 10 | std::enable_if_t<!std::is_same_v<TGet, TFirst>, TGet &> get() { | ||
| 68 | 10 | return TBase::template get<TGet>(); | ||
| 69 | } | |||
| 70 | ||||
| 71 | // We don't have it - check level (n - 1) | |||
| 72 | template <class TGet> | |||
| 73 | 5 | std::enable_if_t<!std::is_same_v<TGet, TFirst>, TGet *> getPtr() { | ||
| 74 | 5 | return TBase::template getPtr<TGet>(); | ||
| 75 | } | |||
| 76 | ||||
| 77 | ✗ | void showInfo(float testInputValue) const { | ||
| 78 | // Print info about this level | |||
| 79 | ✗ | m_f.showInfo(testInputValue); | ||
| 80 | ||||
| 81 | // If valid, recurse down | |||
| 82 | ✗ | auto res = m_f.convert(testInputValue); | ||
| 83 | ✗ | if (res.Valid) { | ||
| 84 | ✗ | TBase::showInfo(res.Value); | ||
| 85 | } | |||
| 86 | ✗ | } | ||
| 87 | ||||
| 88 | private: | |||
| 89 | TFirst m_f; | |||
| 90 | }; | |||
| 91 | } // namespace priv | |||
| 92 | ||||
| 93 | template <typename... TFuncs> | |||
| 94 | class FuncChain : public SensorConverter { | |||
| 95 | public: | |||
| 96 | // Perform chained conversion of all functions in TFuncs | |||
| 97 | 11 | SensorResult convert(float input) const override { | ||
| 98 | 11 | return m_fs.convert(input); | ||
| 99 | } | |||
| 100 | ||||
| 101 | // Access the sub-function of type TGet | |||
| 102 | template <typename TGet> | |||
| 103 | 14 | TGet &get() { | ||
| 104 | 14 | return m_fs.template get<TGet>(); | ||
| 105 | } | |||
| 106 | ||||
| 107 | // references would be sometimes implicitly deleted, right? adding parallel pointer API which would stay? | |||
| 108 | template <typename TGet> | |||
| 109 | 5 | TGet *getPtr() { | ||
| 110 | 5 | return m_fs.template getPtr<TGet>(); | ||
| 111 | } | |||
| 112 | ||||
| 113 | ✗ | void showInfo(float testInputValue) const override { | ||
| 114 | ✗ | m_fs.showInfo(testInputValue); | ||
| 115 | ✗ | } | ||
| 116 | ||||
| 117 | private: | |||
| 118 | priv::FuncChain<TFuncs...> m_fs; | |||
| 119 | }; | |||
| 120 |