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#pragma once
#include <mbgl/util/variant.hpp>
#include <mbgl/style/undefined.hpp>
#include <mbgl/style/function/camera_function.hpp>
#include <mbgl/style/function/source_function.hpp>
#include <mbgl/style/function/composite_function.hpp>
namespace mbgl {
namespace style {
template <class T>
class DataDrivenPropertyValue {
private:
using Value = variant<
Undefined,
T,
CameraFunction<T>,
SourceFunction<T>,
CompositeFunction<T>>;
Value value;
friend bool operator==(const DataDrivenPropertyValue& lhs,
const DataDrivenPropertyValue& rhs) {
return lhs.value == rhs.value;
}
friend bool operator!=(const DataDrivenPropertyValue& lhs,
const DataDrivenPropertyValue& rhs) {
return !(lhs == rhs);
}
public:
DataDrivenPropertyValue() = default;
DataDrivenPropertyValue( T v) : value(std::move(v)) {}
DataDrivenPropertyValue( CameraFunction<T> v) : value(std::move(v)) {}
DataDrivenPropertyValue( SourceFunction<T> v) : value(std::move(v)) {}
DataDrivenPropertyValue(CompositeFunction<T> v) : value(std::move(v)) {}
bool isUndefined() const {
return value.template is<Undefined>();
}
bool isDataDriven() const {
return value.template is<SourceFunction<T>>() || value.template is<CompositeFunction<T>>();
}
bool isZoomConstant() const {
return !value.template is<CameraFunction<T>>() && !value.template is<CompositeFunction<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 DataDrivenPropertyValue<T>& other) const {
return *this != other && (isDataDriven() || other.isDataDriven());
}
};
} // namespace style
} // namespace mbgl
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