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145
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1 // { dg-do run }
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2
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3 // Test returning a T.
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4 // We will use the promise to contain this to avoid having to include
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5 // additional C++ headers.
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6
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7 #include "../coro.h"
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8
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9 struct suspend_never_prt {
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10 bool await_ready() const noexcept { return true; }
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11 void await_suspend(coro::coroutine_handle<>) const noexcept
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12 { PRINT ("susp-never-susp"); }
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13 void await_resume() const noexcept { PRINT ("susp-never-resume");}
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14 };
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15
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16 /* NOTE: this has a DTOR to test that pathway. */
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17 struct suspend_always_prt {
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18 bool await_ready() const noexcept { return false; }
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19 void await_suspend(coro::coroutine_handle<>) const noexcept
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20 { PRINT ("susp-always-susp"); }
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21 void await_resume() const noexcept { PRINT ("susp-always-resume"); }
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22 ~suspend_always_prt() { PRINT ("susp-always-DTOR"); }
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23 };
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24
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25 template <typename T>
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26 struct coro1 {
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27 struct promise_type;
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28 using handle_type = coro::coroutine_handle<coro1::promise_type>;
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29 handle_type handle;
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30 coro1 () : handle(0) {}
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31 coro1 (handle_type _handle)
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32 : handle(_handle) {
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33 PRINT("Created coro1 object from handle");
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34 }
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35 coro1 (const coro1 &) = delete; // no copying
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36 coro1 (coro1 &&s) : handle(s.handle) {
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37 s.handle = nullptr;
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38 PRINT("coro1 mv ctor ");
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39 }
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40 coro1 &operator = (coro1 &&s) {
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41 handle = s.handle;
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42 s.handle = nullptr;
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43 PRINT("coro1 op= ");
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44 return *this;
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45 }
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46 ~coro1() {
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47 PRINT("Destroyed coro1");
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48 if ( handle )
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49 handle.destroy();
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50 }
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51
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52 struct promise_type {
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53 T value;
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54 promise_type() { PRINT ("Created Promise"); }
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55 ~promise_type() { PRINT ("Destroyed Promise"); }
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56
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57 auto get_return_object () {
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58 PRINT ("get_return_object: handle from promise");
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59 return handle_type::from_promise (*this);
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60 }
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61
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62 auto initial_suspend () const {
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63 PRINT ("get initial_suspend (always)");
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64 return suspend_always_prt{};
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65 }
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66 auto final_suspend () const {
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67 PRINT ("get final_suspend (always)");
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68 return suspend_always_prt{};
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69 }
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70 void return_value (T v) {
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71 PRINTF ("return_value () %d\n",v);
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72 value = v;
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73 }
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74 T get_value (void) { return value; }
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75 void unhandled_exception() { PRINT ("** unhandled exception"); }
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76 };
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77 };
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78
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79 coro1<float>
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80 f () noexcept
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81 {
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82 PRINT ("coro1: about to return");
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83 co_return (float) 42;
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84 }
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85
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86 int main ()
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87 {
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88 PRINT ("main: create coro1");
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89 coro1<float> x = f ();
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90 PRINT ("main: got coro1 - resuming");
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91 if (x.handle.done())
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92 abort();
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93 x.handle.resume();
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94 PRINT ("main: after resume");
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95 int y = x.handle.promise().get_value();
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96 if ( y != (float)42 )
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97 abort ();
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98 if (!x.handle.done())
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99 {
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100 PRINT ("main: apparently not done...");
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101 abort ();
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102 }
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103 PRINT ("main: returning");
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104 return 0;
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105 }
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