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-rw-r--r--include/mbgl/style/expression/comparison.hpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/mbgl/style/expression/comparison.hpp b/include/mbgl/style/expression/comparison.hpp
index cf64f5cd34..df1fbcab9e 100644
--- a/include/mbgl/style/expression/comparison.hpp
+++ b/include/mbgl/style/expression/comparison.hpp
@@ -15,7 +15,7 @@ ParseResult parseComparison(const mbgl::style::conversion::Convertible&, Parsing
class BasicComparison : public Expression {
public:
- using CompareFunctionType = bool (*) (Value, Value);
+ using CompareFunctionType = bool (*)(const Value&, const Value&);
BasicComparison(
std::string op,
@@ -38,7 +38,7 @@ private:
class CollatorComparison : public Expression {
public:
- using CompareFunctionType = bool (*) (std::string, std::string, Collator);
+ using CompareFunctionType = bool (*)(const std::string&, const std::string&, const Collator&);
CollatorComparison(
std::string op,