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#pragma once
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <memory>
#include <vector>
namespace mbgl {
namespace style {
namespace expression {
class Length : public Expression {
public:
Length(std::unique_ptr<Expression> input);
static ParseResult parse(const mbgl::style::conversion::Convertible& value, ParsingContext& ctx);
EvaluationResult evaluate(const EvaluationContext& params) const override;
void eachChild(const std::function<void(const Expression&)>& visit) const override;
bool operator==(const Expression& e) const override;
std::vector<optional<Value>> possibleOutputs() const override;
std::string getOperator() const override { return "length"; }
private:
std::unique_ptr<Expression> input;
};
} // namespace expression
} // namespace style
} // namespace mbgl
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