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#pragma once
#include <mbgl/util/variant.hpp>
#include <mbgl/style/undefined.hpp>
#include <mbgl/style/property_expression.hpp>
namespace mbgl {
namespace style {
template <class T>
class PropertyValue {
private:
using Value = variant<
Undefined,
T,
PropertyExpression<T>>;
Value value;
friend bool operator==(const PropertyValue& lhs,
const PropertyValue& rhs) {
return lhs.value == rhs.value;
}
friend bool operator!=(const PropertyValue& lhs,
const PropertyValue& rhs) {
return !(lhs == rhs);
}
public:
PropertyValue() = default;
PropertyValue(T constant)
: value(std::move(constant)) {}
PropertyValue(PropertyExpression<T> expression)
: value(std::move(expression)) {}
bool isUndefined() const {
return value.template is<Undefined>();
}
bool isConstant() const {
return value.template is<T>();
}
bool isExpression() const {
return value.template is<PropertyExpression<T>>();
}
bool isDataDriven() const {
return value.match(
[] (const Undefined&) { return false; },
[] (const T&) { return false; },
[] (const PropertyExpression<T>& fn) { return !fn.isFeatureConstant(); }
);
}
bool isZoomConstant() const {
return value.match(
[] (const Undefined&) { return true; },
[] (const T&) { return true; },
[] (const PropertyExpression<T>& fn) { return fn.isZoomConstant(); }
);
}
const T& asConstant() const {
return value.template get<T>();
}
const PropertyExpression<T>& asExpression() const {
return value.template get<PropertyExpression<T>>();
}
template <class... Ts>
auto match(Ts&&... ts) const {
return value.match(std::forward<Ts>(ts)...);
}
template <typename Evaluator>
auto evaluate(const Evaluator& evaluator, TimePoint = {}) const {
return Value::visit(value, evaluator);
}
bool hasDataDrivenPropertyDifference(const PropertyValue<T>& other) const {
return *this != other && (isDataDriven() || other.isDataDriven());
}
};
} // namespace style
} // namespace mbgl
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