45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
#pragma once
|
|
|
|
#include <mbgl/util/variant.hpp>
|
|
#include <mbgl/style/undefined.hpp>
|
|
#include <mbgl/style/function/camera_function.hpp>
|
|
|
|
namespace mbgl {
|
|
namespace style {
|
|
|
|
template <class T>
|
|
class PropertyValue {
|
|
private:
|
|
using Value = variant<Undefined, T, CameraFunction<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(CameraFunction<T> function) : value(function) {}
|
|
|
|
bool isUndefined() const { return value.which() == 0; }
|
|
bool isConstant() const { return value.which() == 1; }
|
|
bool isCameraFunction() const { return value.which() == 2; }
|
|
bool isDataDriven() const { return false; }
|
|
|
|
const T & asConstant() const { return value.template get< T >(); }
|
|
const CameraFunction<T>& asCameraFunction() const { return value.template get<CameraFunction<T>>(); }
|
|
|
|
template <typename Evaluator>
|
|
auto evaluate(const Evaluator& evaluator) const {
|
|
return Value::visit(value, evaluator);
|
|
}
|
|
};
|
|
|
|
} // namespace style
|
|
} // namespace mbgl
|