57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
#pragma once
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#include <mbgl/util/variant.hpp>
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#include <mbgl/style/undefined.hpp>
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#include <mbgl/style/function/camera_function.hpp>
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#include <mbgl/style/function/source_function.hpp>
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#include <mbgl/style/function/composite_function.hpp>
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namespace mbgl {
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namespace style {
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template <class T>
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class DataDrivenPropertyValue {
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private:
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using Value = variant<
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Undefined,
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T,
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CameraFunction<T>,
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SourceFunction<T>,
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CompositeFunction<T>>;
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Value value;
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friend bool operator==(const DataDrivenPropertyValue& lhs,
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const DataDrivenPropertyValue& rhs) {
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return lhs.value == rhs.value;
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}
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friend bool operator!=(const DataDrivenPropertyValue& lhs,
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const DataDrivenPropertyValue& rhs) {
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return !(lhs == rhs);
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}
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public:
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DataDrivenPropertyValue() = default;
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DataDrivenPropertyValue( T v) : value(std::move(v)) {}
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DataDrivenPropertyValue( CameraFunction<T> v) : value(std::move(v)) {}
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DataDrivenPropertyValue( SourceFunction<T> v) : value(std::move(v)) {}
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DataDrivenPropertyValue(CompositeFunction<T> v) : value(std::move(v)) {}
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bool isUndefined() const {
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return value.template is<Undefined>();
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}
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bool isDataDriven() const {
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return value.template is<SourceFunction<T>>() || value.template is<CompositeFunction<T>>();
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}
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template <typename Evaluator>
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auto evaluate(const Evaluator& evaluator) const {
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return Value::visit(value, evaluator);
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}
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};
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} // namespace style
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} // namespace mbgl
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