Eliminate unnecessary uses of new[]/delete[] that can be replaced

with vector

Also start eliminating uses of plain-old delete that are not helpful

test/cpp/end2end/async_end2end_test.cc

@@ -352,15 +352,13 @@ void ServerWait(Server* server, int* notify) {
 }
 TEST_P(AsyncEnd2endTest, WaitAndShutdownTest) {
   int notify = 0;
-  std::thread* wait_thread =
+  std::thread wait_thread(&ServerWait, server_.get(), &notify);
-      new std::thread(&ServerWait, server_.get(), &notify);
   ResetStub();
   SendRpc(1);
   EXPECT_EQ(0, notify);
   server_->Shutdown();
-  wait_thread->join();
+  wait_thread.join();
   EXPECT_EQ(1, notify);
-  delete wait_thread;
 }
 
 TEST_P(AsyncEnd2endTest, ShutdownThenWait) {

test/cpp/end2end/thread_stress_test.cc

@@ -232,13 +232,13 @@ class CommonStressTestSyncServer : public CommonStressTest<TestServiceImpl> {
 class CommonStressTestAsyncServer
     : public CommonStressTest<grpc::testing::EchoTestService::AsyncService> {
  public:
+  CommonStressTestAsyncServer() : contexts_(kNumAsyncServerThreads * 100) {}
   void SetUp() override {
     shutting_down_ = false;
     ServerBuilder builder;
     SetUpStart(&builder, &service_);
     cq_ = builder.AddCompletionQueue();
     SetUpEnd(&builder);
-    contexts_ = new Context[kNumAsyncServerThreads * 100];
     for (int i = 0; i < kNumAsyncServerThreads * 100; i++) {
       RefreshContext(i);
     }
@@ -265,7 +265,6 @@ class CommonStressTestAsyncServer
     while (cq_->Next(&ignored_tag, &ignored_ok))
       ;
     TearDownEnd();
-    delete[] contexts_;
   }
 
  private:
@@ -311,7 +310,8 @@ class CommonStressTestAsyncServer
         response_writer;
     EchoRequest recv_request;
     enum { READY, DONE } state;
-  } * contexts_;
+  };
+  std::vector<Context> contexts_;
   ::grpc::testing::EchoTestService::AsyncService service_;
   std::unique_ptr<ServerCompletionQueue> cq_;
   bool shutting_down_;
@@ -353,14 +353,12 @@ typedef ::testing::Types<CommonStressTestSyncServer,
 TYPED_TEST_CASE(End2endTest, CommonTypes);
 TYPED_TEST(End2endTest, ThreadStress) {
   this->common_.ResetStub();
-  std::vector<std::thread*> threads;
+  std::vector<std::thread> threads;
   for (int i = 0; i < kNumThreads; ++i) {
-    threads.push_back(
+    threads.emplace_back(SendRpc, this->common_.GetStub(), kNumRpcs);
-        new std::thread(SendRpc, this->common_.GetStub(), kNumRpcs));
   }
   for (int i = 0; i < kNumThreads; ++i) {
-    threads[i]->join();
+    threads[i].join();
-    delete threads[i];
   }
 }
 

test/cpp/qps/client.h

@@ -163,10 +163,9 @@ class Client {
 
     MaybeStartRequests();
 
-    // avoid std::vector for old compilers that expect a copy constructor
     if (reset) {
-      Histogram* to_merge = new Histogram[threads_.size()];
+      std::vector<Histogram> to_merge(threads_.size());
-      StatusHistogram* to_merge_status = new StatusHistogram[threads_.size()];
+      std::vector<StatusHistogram> to_merge_status(threads_.size());
 
       for (size_t i = 0; i < threads_.size(); i++) {
         threads_[i]->BeginSwap(&to_merge[i], &to_merge_status[i]);
@@ -177,8 +176,6 @@ class Client {
         latencies.Merge(to_merge[i]);
         MergeStatusHistogram(to_merge_status[i], &statuses);
       }
-      delete[] to_merge;
-      delete[] to_merge_status;
       timer_result = timer->Mark();
     } else {
       // merge snapshots of each thread histogram

test/cpp/qps/client_sync.cc

@@ -138,10 +138,7 @@ class SynchronousUnaryClient final : public SynchronousClient {
 class SynchronousStreamingClient final : public SynchronousClient {
  public:
   SynchronousStreamingClient(const ClientConfig& config)
-      : SynchronousClient(config) {
+    : SynchronousClient(config), context_(num_threads_), stream_(num_threads_) {
-    context_ = new grpc::ClientContext[num_threads_];
-    stream_ = new std::unique_ptr<
-        grpc::ClientReaderWriter<SimpleRequest, SimpleResponse>>[num_threads_];
     for (size_t thread_idx = 0; thread_idx < num_threads_; thread_idx++) {
       auto* stub = channels_[thread_idx % channels_.size()].get_stub();
       stream_[thread_idx] = stub->StreamingCall(&context_[thread_idx]);
@@ -161,8 +158,6 @@ class SynchronousStreamingClient final : public SynchronousClient {
         }
       }
     }
-    delete[] stream_;
-    delete[] context_;
   }
 
   bool ThreadFunc(HistogramEntry* entry, size_t thread_idx) override {
@@ -182,9 +177,8 @@ class SynchronousStreamingClient final : public SynchronousClient {
  private:
   // These are both conceptually std::vector but cannot be for old compilers
   // that expect contained classes to support copy constructors
-  grpc::ClientContext* context_;
+  std::vector<grpc::ClientContext> context_;
-  std::unique_ptr<grpc::ClientReaderWriter<SimpleRequest, SimpleResponse>>*
+  std::vector<std::unique_ptr<grpc::ClientReaderWriter<SimpleRequest, SimpleResponse>>> stream_;
-      stream_;
 };
 
 std::unique_ptr<Client> CreateSynchronousUnaryClient(

test/cpp/qps/driver.cc

@@ -262,10 +262,7 @@ std::unique_ptr<ScenarioResult> RunScenario(
   workers.resize(num_clients + num_servers);
 
   // Start servers
-  using runsc::ServerData;
+  std::vector<runsc::ServerData> servers(num_servers);
-  // servers is array rather than std::vector to avoid gcc-4.4 issues
-  // where class contained in std::vector must have a copy constructor
-  auto* servers = new ServerData[num_servers];
   for (size_t i = 0; i < num_servers; i++) {
     gpr_log(GPR_INFO, "Starting server on %s (worker #%" PRIuPTR ")",
             workers[i].c_str(), i);
@@ -328,10 +325,7 @@ std::unique_ptr<ScenarioResult> RunScenario(
   // Targets are all set by now
   result_client_config = client_config;
   // Start clients
-  using runsc::ClientData;
+  std::vector<runsc::ClientData> clients(num_clients);
-  // clients is array rather than std::vector to avoid gcc-4.4 issues
-  // where class contained in std::vector must have a copy constructor
-  auto* clients = new ClientData[num_clients];
   size_t channels_allocated = 0;
   for (size_t i = 0; i < num_clients; i++) {
     const auto& worker = workers[i + num_servers];
@@ -501,7 +495,6 @@ std::unique_ptr<ScenarioResult> RunScenario(
               s.error_message().c_str());
     }
   }
-  delete[] clients;
 
   merged_latencies.FillProto(result->mutable_latencies());
   for (std::unordered_map<int, int64_t>::iterator it = merged_statuses.begin();
@@ -544,8 +537,6 @@ std::unique_ptr<ScenarioResult> RunScenario(
     }
   }
 
-  delete[] servers;
-
   postprocess_scenario_result(result.get());
   return result;
 }