ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change
on this file since e67a82d was
571bf75,
checked in by tdelisle <tdelisle@…>, 5 years ago
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Clean existing coroutines using std::experimental::suspend_never and fixed Format coroutines to use RAII
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-
Property mode set to
100644
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File size:
1.8 KB
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1 | #include <iostream> |
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2 | #include <experimental/coroutine> |
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3 | |
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4 | struct fmt_cor { |
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5 | struct promise_type { |
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6 | char _value; |
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7 | |
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8 | fmt_cor get_return_object() { |
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9 | return fmt_cor(std::experimental::coroutine_handle<promise_type>::from_promise(*this)); |
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10 | } |
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11 | |
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12 | auto initial_suspend() { return std::experimental::suspend_never(); } |
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13 | auto final_suspend() { return std::experimental::suspend_always(); } |
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14 | |
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15 | void return_void() {} |
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16 | void unhandled_exception() {} |
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17 | }; |
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18 | |
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19 | struct get { |
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20 | promise_type * _promise = nullptr; |
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21 | |
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22 | bool await_ready() noexcept { |
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23 | return false; |
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24 | } |
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25 | |
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26 | void await_suspend(std::experimental::coroutine_handle<promise_type> _coroutine) noexcept { |
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27 | _promise = &_coroutine.promise(); |
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28 | } |
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29 | char await_resume() noexcept { |
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30 | assert(_promise); |
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31 | return _promise->_value; |
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32 | } |
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33 | }; |
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34 | |
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35 | std::experimental::coroutine_handle<promise_type> _coroutine = nullptr; |
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36 | |
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37 | explicit fmt_cor(std::experimental::coroutine_handle<promise_type> coroutine) |
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38 | : _coroutine(coroutine) |
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39 | {} |
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40 | |
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41 | ~fmt_cor() { |
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42 | if(_coroutine) { |
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43 | _coroutine.destroy(); |
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44 | |
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45 | } |
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46 | } |
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47 | |
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48 | fmt_cor() = default; |
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49 | fmt_cor(fmt_cor const &) = delete; |
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50 | fmt_cor& operator=(fmt_cor const &) = delete; |
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51 | |
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52 | fmt_cor(fmt_cor&& other) { |
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53 | std::swap(_coroutine, other._coroutine); |
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54 | } |
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55 | |
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56 | fmt_cor& operator=(fmt_cor&& other) { |
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57 | if(&other != this) { |
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58 | _coroutine = other._coroutine; |
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59 | other._coroutine = nullptr; |
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60 | } |
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61 | return *this; |
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62 | } |
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63 | |
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64 | void send(char a) { |
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65 | _coroutine.promise()._value = a; |
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66 | _coroutine.resume(); |
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67 | } |
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68 | }; |
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69 | |
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70 | fmt_cor Fmt() { |
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71 | struct locals { |
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72 | int g, b; |
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73 | |
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74 | ~locals() { |
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75 | if (g != 0 | b != 0) { |
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76 | std::cout << "\n"; |
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77 | } |
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78 | } |
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79 | } l; |
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80 | for(;;) { |
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81 | for(l.g = 0; l.g < 5; l.g++) { |
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82 | for(l.b = 0; l.b < 4; l.b++) { |
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83 | std::cout << co_await fmt_cor::get(); |
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84 | } |
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85 | std::cout << " "; |
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86 | } |
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87 | std::cout << std::endl; |
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88 | } |
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89 | } |
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90 | |
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91 | int main() { |
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92 | auto fmt = Fmt(); |
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93 | for(int i = 0; i < 41; i++) { |
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94 | fmt.send('a'); |
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95 | } |
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96 | } |
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