From 2c9def7e141c4cba47cb03120a62dc515d1e256d Mon Sep 17 00:00:00 2001
From: Dmitry Kokorin <dmitry@kokorin.org>
Date: Mon, 7 Mar 2016 22:20:13 +0300
Subject: [PATCH] etl: iteration 2; auto const &

---
 cpp/etl/etl.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpp/etl/etl.cpp b/cpp/etl/etl.cpp
index a98ccd8..c736a48 100644
--- a/cpp/etl/etl.cpp
+++ b/cpp/etl/etl.cpp
@@ -10,7 +10,7 @@ new_score_t transform(const old_score_t &input)
 {
     new_score_t result;
 
-    for (auto pair : input)
+    for (auto const &pair : input)
         for (auto c : pair.second)
             result[tolower(c)] = pair.first;