[ray] Update cpp to std14 (#14441)

.bazelrc

@@ -7,7 +7,7 @@ build --enable_platform_specific_config
 build --action_env=PATH
 # For --compilation_mode=dbg, consider enabling checks in the standard library as well (below).
 build --compilation_mode=opt
-#build --cxxopt="-std=c++11"
+build --cxxopt="-std=c++14"
 # This workaround is needed to prevent Bazel from compiling the same file twice (once PIC and once not).
 build:linux --force_pic
 build:macos --force_pic

.travis.yml

@@ -187,7 +187,7 @@ matrix:
         - brew install --cask adoptopenjdk8
         - export JAVA_HOME=/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home
         - java -version
-        - . ./ci/travis/ci.sh build
+        - ./ci/keep_alive bash ./ci/travis/ci.sh build
       script:
         - . ./ci/travis/ci.sh test_wheels
         - bash ./java/build-jar-multiplatform.sh darwin

ci/keep_alive

@@ -5,7 +5,7 @@ PID=$$
 
 # Print output to avoid travis killing us
 watchdog() {
-    for i in $(seq 2 2 150); do
+    for i in $(seq 2 2 500); do
         sleep 120
         echo "(running, ${i}m total)"
     done

src/ray/core_worker/core_worker.cc

@@ -1539,10 +1539,10 @@ Status CoreWorker::CreateActor(const RayFunction &function,
   // Add the actor handle before we submit the actor creation task, since the
   // actor handle must be in scope by the time the GCS sends the
   // WaitForActorOutOfScopeRequest.
-  std::unique_ptr<ActorHandle> actor_handle(new ActorHandle(
+  auto actor_handle = std::make_unique<ActorHandle>(
       actor_id, GetCallerId(), rpc_address_, job_id, /*actor_cursor=*/return_ids[0],
       function.GetLanguage(), function.GetFunctionDescriptor(), extension_data,
-      actor_creation_options.max_task_retries));
+      actor_creation_options.max_task_retries);
   RAY_CHECK(actor_manager_->AddNewActorHandle(std::move(actor_handle), GetCallerId(),
                                               CurrentCallSite(), rpc_address_,
                                               actor_creation_options.is_detached))