gpio.h

#ifndef GPIO_H
#define GPIO_H

#include <vector>

namespace gpio {
    
class pin {
public:
    virtual ~pin();
    
    unsigned int number() const { return m_number; }
    
    virtual bool state() const;

protected:
    explicit pin(unsigned int number);

private:
    static std::vector<unsigned int> s_registeredPins;
    unsigned int m_number;
};

class input_pin : public pin {
public:
    explicit input_pin(unsigned int number);
};

class output_pin : public pin {
public:
    explicit output_pin(unsigned int number);

    void set_state(bool value);
};

// class used for digital buttons connected to GND, derrived of input
class button_pin : public input_pin {
public:
    explicit button_pin(unsigned int number);

    virtual bool state() const override;
};
}

// functions
#ifdef __cplusplus
extern "C" {
#endif

void delay(unsigned long milliseconds);

#ifdef __cplusplus
}
#endif

#endif // GPIO_H