error.hpp

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#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(Kind::Error, type::Error),
          message(std::move(message_)) {}
 
    void eachChild(const std::function<void(const Expression&)>&) const override {}
 
    bool operator==(const Expression& e) const override {
        return e.getKind() == Kind::Error;
    }
 
    EvaluationResult evaluate(const EvaluationContext&) const override {
        return EvaluationError{message};
    }
 
    std::vector<std::optional<Value>> possibleOutputs() const override {
        return {};
    }
 
    std::string getOperator() const override { return "error"; }
 
private:
    std::string message;
};
 
} // namespace expression
} // namespace style
} // namespace mbgl