From 54e3a05d522445307b493937081b5a32cae09361 Mon Sep 17 00:00:00 2001
From: Mikhail Pozdnyakov <mikhail.pozdnyakov@mapbox.com>
Date: Wed, 24 Jul 2019 18:19:00 +0300
Subject: [core] Avoid copying feature properties

---
 src/mbgl/style/expression/compound_expression.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/mbgl/style/expression/compound_expression.cpp')

diff --git a/src/mbgl/style/expression/compound_expression.cpp b/src/mbgl/style/expression/compound_expression.cpp
index cc1d58025b..34f0f5dea3 100644
--- a/src/mbgl/style/expression/compound_expression.cpp
+++ b/src/mbgl/style/expression/compound_expression.cpp
@@ -423,7 +423,8 @@ const auto& propertiesCompoundExpression() {
             };
         }
         std::unordered_map<std::string, Value> result;
-        const PropertyMap properties = params.feature->getProperties();
+        const PropertyMap& properties = params.feature->getProperties();
+        result.reserve(properties.size());
         for (const auto& entry : properties) {
             result[entry.first] = toExpressionValue(entry.second);
         }
-- 
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