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#pragma once
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/conversion.hpp>
#include <memory>
#include <vector>
namespace mbgl {
namespace style {
namespace expression {
/**
* Special form for error-coalescing coercion expressions "to-number",
* "to-color". Since these coercions can fail at runtime, they accept multiple
* arguments, only evaluating one at a time until one succeeds.
*/
class Coercion : public Expression {
public:
Coercion(type::Type type_, std::vector<std::unique_ptr<Expression>> inputs_);
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;
private:
EvaluationResult (*coerceSingleValue) (const Value& v);
std::vector<std::unique_ptr<Expression>> inputs;
};
} // namespace expression
} // namespace style
} // namespace mbgl
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