function_pointer_sensor.h

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/**
 * @file    function_pointer_sensor.h
 * @brief A sensor to provide a bridge from old getX()-style functions to the new sensor registry.
 *
 * @date September 12, 2019
 * @author Matthew Kennedy, (c) 2019
 */
 
#pragma once
 
#include "sensor.h"
 
/* This class is intended as a bridge to bridge from old getMySensor() functions
 * to the new system.  This way, producers and consumers can be independently
 * updated to the new system, with sensors being usable either way for some time.
 */
class FunctionPointerSensor final : public Sensor {
public:
    FunctionPointerSensor(SensorType type, float (*func)())
        : Sensor(type)
        , m_func(func) {}
 
    SensorResult get() const final {
        float result = m_func();
 
        // check for NaN
        bool valid = !(result != result);
 
        if (!valid) {
            return unexpected;
        }
 
        return result;
    }
 
    void showInfo(const char* /*sensorName*/) const override {}
 
private:
    float (*m_func)();
};