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-rw-r--r--examples/cpp/helloworld/greeter_async_client.cc4
1 files changed, 3 insertions, 1 deletions
diff --git a/examples/cpp/helloworld/greeter_async_client.cc b/examples/cpp/helloworld/greeter_async_client.cc
index c1f5eb55f0..33de59fb95 100644
--- a/examples/cpp/helloworld/greeter_async_client.cc
+++ b/examples/cpp/helloworld/greeter_async_client.cc
@@ -87,7 +87,9 @@ class GreeterClient {
void* got_tag;
bool ok = false;
// Block until the next result is available in the completion queue "cq".
- cq.Next(&got_tag, &ok);
+ // The return value of Next should always be checked. This return value
+ // tells us whether there is any kind of event or the cq_ is shutting down.
+ GPR_ASSERT(cq.Next(&got_tag, &ok));
// Verify that the result from "cq" corresponds, by its tag, our previous
// request.