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view gcc/testsuite/g++.dg/coroutines/torture/co-ret-10-expression-evaluates-once.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 } // Check that "co_return expression;" only evaluates expression once. #include "../coro.h" // boiler-plate for tests of codegen #include "../coro1-ret-int-yield-int.h" /* Give foo() a measureable side-effect. */ int gX = 1; __attribute__((__noinline__)) int foo (void) { PRINT ("called the int fn foo"); gX += 1; return gX; } struct coro1 f () noexcept { PRINT ("coro1: about to return"); co_return foo(); } int main () { PRINT ("main: create coro1"); struct coro1 x = f (); PRINT ("main: got coro1 - resuming"); if (x.handle.done()) abort(); x.handle.resume(); // We want to check that foo() was called exactly once. if (gX != 2) { PRINT ("main: failed check for a single call to foo()"); abort (); } PRINT ("main: after resume"); if (!x.handle.done()) { PRINT ("main: apparently not done..."); abort (); } PRINT ("main: returning"); return 0; }