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#ifndef MBGL_PROPERTY_EVALUATOR
#define MBGL_PROPERTY_EVALUATOR
#include <mbgl/style/zoom_history.hpp>
#include <mbgl/style/function_properties.hpp>
#include <mbgl/style/piecewisefunction_properties.hpp>
#include <mbgl/style/style_calculation_parameters.hpp>
namespace mbgl {
struct ZoomHistory;
template <typename T>
class PropertyEvaluator {
public:
typedef T result_type;
PropertyEvaluator(const StyleCalculationParameters& parameters_)
: parameters(parameters_) {}
template <typename P, typename std::enable_if<std::is_convertible<P, T>::value, int>::type = 0>
T operator()(const P &value) const {
return value;
}
T operator()(const Function<T>& value) const {
return mapbox::util::apply_visitor(FunctionEvaluator<T>(parameters.z), value);
}
T operator()(const PiecewiseConstantFunction<T>& value) const {
return value.evaluate(parameters);
}
template <typename P, typename std::enable_if<!std::is_convertible<P, T>::value, int>::type = 0>
T operator()(const P &) const {
return T();
}
private:
StyleCalculationParameters parameters;
};
}
#endif
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