From a49c65517a227818503c4143d348fd09f93db153 Mon Sep 17 00:00:00 2001
From: Anna Henningsen <anna@addaleax.net>
Date: Fri, 27 Apr 2018 15:21:17 +0200
Subject: [PATCH] src: remove unnecessary copy operations in tracing code

---
 src/node_trace_events.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/node_trace_events.cc b/src/node_trace_events.cc
index 1e02048d1f0843..f37537d54544a2 100644
--- a/src/node_trace_events.cc
+++ b/src/node_trace_events.cc
@@ -63,7 +63,7 @@ void NodeCategorySet::Enable(const FunctionCallbackInfo<Value>& args) {
   NodeCategorySet* category_set;
   ASSIGN_OR_RETURN_UNWRAP(&category_set, args.Holder());
   CHECK_NE(category_set, nullptr);
-  auto categories = category_set->GetCategories();
+  const auto& categories = category_set->GetCategories();
   if (!category_set->enabled_ && !categories.empty()) {
     env->tracing_agent()->Enable(categories);
     category_set->enabled_ = true;
@@ -75,7 +75,7 @@ void NodeCategorySet::Disable(const FunctionCallbackInfo<Value>& args) {
   NodeCategorySet* category_set;
   ASSIGN_OR_RETURN_UNWRAP(&category_set, args.Holder());
   CHECK_NE(category_set, nullptr);
-  auto categories = category_set->GetCategories();
+  const auto& categories = category_set->GetCategories();
   if (category_set->enabled_ && !categories.empty()) {
     env->tracing_agent()->Disable(categories);
     category_set->enabled_ = false;