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-rw-r--r--include/mbgl/style/expression/dsl.hpp23
1 files changed, 15 insertions, 8 deletions
diff --git a/include/mbgl/style/expression/dsl.hpp b/include/mbgl/style/expression/dsl.hpp
index bd94a765e7..dc0f1ab90f 100644
--- a/include/mbgl/style/expression/dsl.hpp
+++ b/include/mbgl/style/expression/dsl.hpp
@@ -31,14 +31,21 @@ std::unique_ptr<Expression> literal(Value value);
std::unique_ptr<Expression> literal(std::initializer_list<double> value);
std::unique_ptr<Expression> literal(std::initializer_list<const char *> value);
-std::unique_ptr<Expression> assertion(type::Type, std::unique_ptr<Expression>);
-std::unique_ptr<Expression> number(std::unique_ptr<Expression>);
-std::unique_ptr<Expression> string(std::unique_ptr<Expression>);
-std::unique_ptr<Expression> boolean(std::unique_ptr<Expression>);
-
-std::unique_ptr<Expression> toColor(std::unique_ptr<Expression>);
-std::unique_ptr<Expression> toString(std::unique_ptr<Expression>);
-std::unique_ptr<Expression> toFormatted(std::unique_ptr<Expression>);
+std::unique_ptr<Expression> assertion(type::Type, std::unique_ptr<Expression>,
+ optional<std::unique_ptr<Expression>> def = {});
+std::unique_ptr<Expression> number(std::unique_ptr<Expression>,
+ optional<std::unique_ptr<Expression>> def = {});
+std::unique_ptr<Expression> string(std::unique_ptr<Expression>,
+ optional<std::unique_ptr<Expression>> def = {});
+std::unique_ptr<Expression> boolean(std::unique_ptr<Expression>,
+ optional<std::unique_ptr<Expression>> def = {});
+
+std::unique_ptr<Expression> toColor(std::unique_ptr<Expression>,
+ optional<std::unique_ptr<Expression>> def = {});
+std::unique_ptr<Expression> toString(std::unique_ptr<Expression>,
+ optional<std::unique_ptr<Expression>> def = {});
+std::unique_ptr<Expression> toFormatted(std::unique_ptr<Expression>,
+ optional<std::unique_ptr<Expression>> def = {});
std::unique_ptr<Expression> get(const char* value);
std::unique_ptr<Expression> get(std::unique_ptr<Expression>);