1 files changed, 39 insertions, 0 deletions
diff --git a/include/mbgl/style/expression/error.hpp b/include/mbgl/style/expression/error.hpp
new file mode 100644
index 0000000000..bfb9247d11
--- /dev/null
+++ b/include/mbgl/style/expression/error.hpp
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <mbgl/style/expression/expression.hpp>
+
+#include <string>
+
+namespace mbgl {
+namespace style {
+namespace expression {
+
+class Error : public Expression {
+public:
+    Error(std::string message_) 
+        : Expression(type::Error),
+          message(std::move(message_)) {}
+
+    void eachChild(const std::function<void(const Expression&)>&) const override {}
+
+    bool operator==(const Expression& e) const override {
+        return dynamic_cast<const Error*>(&e);
+    }
+
+    EvaluationResult evaluate(const EvaluationContext&) const override {
+        return EvaluationError{message};
+    }
+
+    std::vector<optional<Value>> possibleOutputs() const override {
+        return {};
+    }
+
+    std::string getOperator() const override { return "error"; }
+
+private:
+    std::string message;
+};
+
+} // namespace expression
+} // namespace style
+} // namespace mbgl