blob: 4653224f15baf85ccca3db5830fc2b7697b1afa2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
#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;
}
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>>();
}
template <typename Evaluator>
auto evaluate(const Evaluator& evaluator) const {
return Value::visit(value, evaluator);
}
};
} // namespace style
} // namespace mbgl
|