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#ifndef MBGL_STYLE_FUNCTION
#define MBGL_STYLE_FUNCTION
#include <mbgl/style/types.hpp>
#include <mbgl/util/chrono.hpp>
#include <mbgl/util/optional.hpp>
#include <vector>
#include <utility>
namespace mbgl {
class StyleCalculationParameters;
template <typename T>
class Function {
public:
using Stop = std::pair<float, T>;
using Stops = std::vector<Stop>;
// TODO: make explicit
/* explicit */ Function(const T& constant)
: stops({{ 0, constant }}) {}
explicit Function(const Stops& stops_, float base_)
: base(base_), stops(stops_) {}
T evaluate(const StyleCalculationParameters&) const;
float getBase() const { return base; }
const std::vector<std::pair<float, T>>& getStops() const { return stops; }
private:
float base = 1;
std::vector<std::pair<float, T>> stops;
};
// Partial specialization for cross-faded properties (*-pattern, line-dasharray).
template <typename T>
class Function<Faded<T>> {
public:
using Stop = std::pair<float, T>;
using Stops = std::vector<Stop>;
// TODO: make explicit
/* explicit */ Function(const T& constant)
: stops({{ 0, constant }}) {}
explicit Function(const Stops& stops_)
: stops(stops_) {}
Faded<T> evaluate(const StyleCalculationParameters&) const;
private:
std::vector<std::pair<float, T>> stops;
};
} // namespace mbgl
#endif
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