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#ifndef MBGL_STYLE_FUNCTION_PROPERTIES
#define MBGL_STYLE_FUNCTION_PROPERTIES
#include <mapbox/variant.hpp>
#include <vector>
namespace mbgl {
template <typename T>
struct ConstantFunction {
inline ConstantFunction(const T &value_) : value(value_) {}
inline T evaluate(float) const { return value; }
private:
const T value;
};
template <typename T>
struct StopsFunction {
inline StopsFunction(const std::vector<std::pair<float, T>> &values_, float base_) : values(values_), base(base_) {}
T evaluate(float z) const;
private:
const std::vector<std::pair<float, T>> values;
const float base;
};
template <typename T>
using Function = mapbox::util::variant<
std::false_type,
ConstantFunction<T>,
StopsFunction<T>
>;
template <typename T>
struct FunctionEvaluator {
typedef T result_type;
inline FunctionEvaluator(float z_) : z(z_) {}
inline result_type operator()(const std::false_type &) {
return result_type();
}
template <template <typename> class Fn>
inline result_type operator()(const Fn<T>& fn) {
return fn.evaluate(z);
}
private:
float z;
};
}
#endif
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