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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()
: value() {}
PropertyValue(T constant)
: value(constant) {}
PropertyValue(PropertyExpression<T> expression)
: value(expression) {
assert(expression.isFeatureConstant());
}
bool isUndefined() const { return value.which() == 0; }
bool isConstant() const { return value.which() == 1; }
bool isExpression() const { return value.which() == 2; }
bool isDataDriven() const { return false; }
const T & asConstant() const { return value.template get< T >(); }
const PropertyExpression<T>& asExpression() const { return value.template get<PropertyExpression<T>>(); }
template <typename Evaluator>
auto evaluate(const Evaluator& evaluator, TimePoint = {}) const {
return Value::visit(value, evaluator);
}
bool hasDataDrivenPropertyDifference(const PropertyValue<T>&) const {
return false;
}
};
} // namespace style
} // namespace mbgl
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