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view gcc/testsuite/g++.dg/coroutines/torture/co-ret-06-template-promise-val-1.C @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
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// { dg-do run } // Test returning a T. // We will use the promise to contain this to avoid having to include // additional C++ headers. #include "../coro.h" struct suspend_never_prt { bool await_ready() const noexcept { return true; } void await_suspend(coro::coroutine_handle<>) const noexcept { PRINT ("susp-never-susp"); } void await_resume() const noexcept { PRINT ("susp-never-resume");} }; /* NOTE: this has a DTOR to test that pathway. */ struct suspend_always_prt { bool await_ready() const noexcept { return false; } void await_suspend(coro::coroutine_handle<>) const noexcept { PRINT ("susp-always-susp"); } void await_resume() const noexcept { PRINT ("susp-always-resume"); } ~suspend_always_prt() { PRINT ("susp-always-DTOR"); } }; template <typename T> struct coro1 { struct promise_type; using handle_type = coro::coroutine_handle<coro1::promise_type>; handle_type handle; coro1 () : handle(0) {} coro1 (handle_type _handle) : handle(_handle) { PRINT("Created coro1 object from handle"); } coro1 (const coro1 &) = delete; // no copying coro1 (coro1 &&s) : handle(s.handle) { s.handle = nullptr; PRINT("coro1 mv ctor "); } coro1 &operator = (coro1 &&s) { handle = s.handle; s.handle = nullptr; PRINT("coro1 op= "); return *this; } ~coro1() { PRINT("Destroyed coro1"); if ( handle ) handle.destroy(); } struct promise_type { T value; promise_type() { PRINT ("Created Promise"); } ~promise_type() { PRINT ("Destroyed Promise"); } auto get_return_object () { PRINT ("get_return_object: handle from promise"); return handle_type::from_promise (*this); } auto initial_suspend () const { PRINT ("get initial_suspend (always)"); return suspend_always_prt{}; } auto final_suspend () const { PRINT ("get final_suspend (always)"); return suspend_always_prt{}; } void return_value (T v) { PRINTF ("return_value () %d\n",v); value = v; } T get_value (void) { return value; } void unhandled_exception() { PRINT ("** unhandled exception"); } }; }; coro1<float> f () noexcept { PRINT ("coro1: about to return"); co_return (float) 42; } int main () { PRINT ("main: create coro1"); coro1<float> x = f (); PRINT ("main: got coro1 - resuming"); if (x.handle.done()) abort(); x.handle.resume(); PRINT ("main: after resume"); int y = x.handle.promise().get_value(); if ( y != (float)42 ) abort (); if (!x.handle.done()) { PRINT ("main: apparently not done..."); abort (); } PRINT ("main: returning"); return 0; }