1 //  { dg-do run }
2 
3 // GRO differs from the eventual return type.
4 
5 # include "../coro.h"
6 
7 struct coro1 {
8   struct promise_type;
9   using handle_type = coro::coroutine_handle<coro1::promise_type>;
10   handle_type handle;
coro1coro111   coro1 () : handle(0) {}
coro1coro112   coro1 (handle_type _handle)
13     : handle(_handle) {
14         PRINT("Created coro1 object from handle");
15   }
16   coro1 (const coro1 &) = delete; // no copying
coro1coro117   coro1 (coro1 &&s) : handle(s.handle) {
18 	s.handle = nullptr;
19 	PRINT("coro1 mv ctor ");
20   }
21   coro1 &operator = (coro1 &&s) {
22 	handle = s.handle;
23 	s.handle = nullptr;
24 	PRINT("coro1 op=  ");
25 	return *this;
26   }
~coro1coro127   ~coro1() {
28         PRINT("Destroyed coro1");
29         if ( handle )
30           handle.destroy();
31   }
32 
33   struct suspend_never_prt {
await_readycoro1::suspend_never_prt34   bool await_ready() const noexcept { return true; }
await_suspendcoro1::suspend_never_prt35   void await_suspend(handle_type) const noexcept { PRINT ("susp-never-susp");}
await_resumecoro1::suspend_never_prt36   void await_resume() const noexcept { PRINT ("susp-never-resume");}
~suspend_never_prtcoro1::suspend_never_prt37   ~suspend_never_prt() {};
38   };
39 
40   struct  suspend_always_prt {
await_readycoro1::suspend_always_prt41   bool await_ready() const noexcept { return false; }
await_suspendcoro1::suspend_always_prt42   void await_suspend(handle_type) const noexcept { PRINT ("susp-always-susp");}
await_resumecoro1::suspend_always_prt43   void await_resume() const noexcept { PRINT ("susp-always-resume");}
44   };
45 
46   struct promise_type {
promise_typecoro1::promise_type47   promise_type() {  PRINT ("Created Promise"); }
~promise_typecoro1::promise_type48   ~promise_type() { PRINT ("Destroyed Promise"); }
49 
get_return_objectcoro1::promise_type50   auto get_return_object () {
51     PRINT ("get_return_object: handle from promise");
52     return handle_type::from_promise (*this);
53   }
initial_suspendcoro1::promise_type54   auto initial_suspend () {
55     PRINT ("get initial_suspend (always)");
56     return suspend_always_prt{};
57   }
final_suspendcoro1::promise_type58   auto final_suspend () noexcept {
59     PRINT ("get final_suspend (always)");
60     return suspend_always_prt{};
61   }
return_voidcoro1::promise_type62   void return_void () {
63     PRINT ("return_void ()");
64   }
unhandled_exceptioncoro1::promise_type65   void unhandled_exception() { PRINT ("** unhandled exception"); }
66   };
67 };
68 
69 struct coro1
f()70 f () noexcept
71 {
72   PRINT ("coro1: about to return");
73   co_return;
74 }
75 
main()76 int main ()
77 {
78   PRINT ("main: create coro1");
79   struct coro1 x = f ();
80   PRINT ("main: got coro1 - resuming");
81   if (x.handle.done())
82     abort();
83   x.handle.resume();
84   PRINT ("main: after resume");
85   if (!x.handle.done())
86     {
87       PRINT ("main: apparently not done...");
88       abort ();
89     }
90   PRINT ("main: returning");
91   return 0;
92 }
93