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comparison gcc/testsuite/g++.dg/coroutines/torture/co-ret-06-template-promise-val-1.C @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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131:84e7813d76e9 145:1830386684a0
1 // { dg-do run }
2
3 // Test returning a T.
4 // We will use the promise to contain this to avoid having to include
5 // additional C++ headers.
6
7 #include "../coro.h"
8
9 struct suspend_never_prt {
10 bool await_ready() const noexcept { return true; }
11 void await_suspend(coro::coroutine_handle<>) const noexcept
12 { PRINT ("susp-never-susp"); }
13 void await_resume() const noexcept { PRINT ("susp-never-resume");}
14 };
15
16 /* NOTE: this has a DTOR to test that pathway. */
17 struct suspend_always_prt {
18 bool await_ready() const noexcept { return false; }
19 void await_suspend(coro::coroutine_handle<>) const noexcept
20 { PRINT ("susp-always-susp"); }
21 void await_resume() const noexcept { PRINT ("susp-always-resume"); }
22 ~suspend_always_prt() { PRINT ("susp-always-DTOR"); }
23 };
24
25 template <typename T>
26 struct coro1 {
27 struct promise_type;
28 using handle_type = coro::coroutine_handle<coro1::promise_type>;
29 handle_type handle;
30 coro1 () : handle(0) {}
31 coro1 (handle_type _handle)
32 : handle(_handle) {
33 PRINT("Created coro1 object from handle");
34 }
35 coro1 (const coro1 &) = delete; // no copying
36 coro1 (coro1 &&s) : handle(s.handle) {
37 s.handle = nullptr;
38 PRINT("coro1 mv ctor ");
39 }
40 coro1 &operator = (coro1 &&s) {
41 handle = s.handle;
42 s.handle = nullptr;
43 PRINT("coro1 op= ");
44 return *this;
45 }
46 ~coro1() {
47 PRINT("Destroyed coro1");
48 if ( handle )
49 handle.destroy();
50 }
51
52 struct promise_type {
53 T value;
54 promise_type() { PRINT ("Created Promise"); }
55 ~promise_type() { PRINT ("Destroyed Promise"); }
56
57 auto get_return_object () {
58 PRINT ("get_return_object: handle from promise");
59 return handle_type::from_promise (*this);
60 }
61
62 auto initial_suspend () const {
63 PRINT ("get initial_suspend (always)");
64 return suspend_always_prt{};
65 }
66 auto final_suspend () const {
67 PRINT ("get final_suspend (always)");
68 return suspend_always_prt{};
69 }
70 void return_value (T v) {
71 PRINTF ("return_value () %d\n",v);
72 value = v;
73 }
74 T get_value (void) { return value; }
75 void unhandled_exception() { PRINT ("** unhandled exception"); }
76 };
77 };
78
79 coro1<float>
80 f () noexcept
81 {
82 PRINT ("coro1: about to return");
83 co_return (float) 42;
84 }
85
86 int main ()
87 {
88 PRINT ("main: create coro1");
89 coro1<float> x = f ();
90 PRINT ("main: got coro1 - resuming");
91 if (x.handle.done())
92 abort();
93 x.handle.resume();
94 PRINT ("main: after resume");
95 int y = x.handle.promise().get_value();
96 if ( y != (float)42 )
97 abort ();
98 if (!x.handle.done())
99 {
100 PRINT ("main: apparently not done...");
101 abort ();
102 }
103 PRINT ("main: returning");
104 return 0;
105 }