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view gcc/testsuite/g++.dg/coroutines/torture/co-yield-00-triv.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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// { dg-do run } // Test yielding an int. // We will use the promise to contain this to avoid having to include // additional C++ headers. // Check that we resolve the correct overload for the yield_value method. #include "../coro.h" 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 suspend_never_prt { bool await_ready() const noexcept { return true; } void await_suspend(handle_type) 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(handle_type) const noexcept { PRINT ("susp-always-susp"); } void await_resume() const noexcept { PRINT ("susp-always-resume"); } ~suspend_always_prt() { PRINT ("susp-always-DTOR"); } }; struct promise_type { int 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 () { PRINT ("get initial_suspend (always)"); return suspend_always_prt{}; } auto final_suspend () { PRINT ("get final_suspend (always)"); return suspend_always_prt{}; } void return_value (int v) { PRINTF ("return_value () %d\n",v); value = v; } auto yield_value (int v) { PRINTF ("yield_value () %d and suspend always\n",v); value = v; return suspend_always_prt{}; } /* Some non-matching overloads. */ auto yield_value (suspend_always_prt s, int x) { return s; } auto yield_value (void) { return 42; } int get_value (void) { return value; } void unhandled_exception() { PRINT ("** unhandled exception"); } }; }; struct coro1 f () noexcept { PRINT ("f: about to yield 42"); co_yield 42; PRINT ("f: about to return 6174"); co_return 6174; } int main () { PRINT ("main: create coro1"); struct coro1 x = f (); PRINT ("main: got coro1 - resuming (1)"); if (x.handle.done()) abort(); x.handle.resume(); PRINT ("main: after resume (1)"); int y = x.handle.promise().get_value(); if ( y != 42 ) abort (); PRINT ("main: apparently got 42"); PRINT ("main: got coro1 - resuming (2)"); if (x.handle.done()) abort(); x.handle.resume(); PRINT ("main: after resume (2)"); y = x.handle.promise().get_value(); if ( y != 6174 ) abort (); PRINT ("main: apparently got 6174"); if (!x.handle.done()) { PRINT ("main: apparently not done..."); abort (); } PRINT ("main: returning"); return 0; }