producer.h

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#ifndef PRODUCER_H
#define PRODUCER_H
 
template <typename T>
class Consumer;

template <typename T>
class Producer {
    public:
        T next(const Consumer<T>* const consumer);

        void register_consumer(const Consumer<T>* const consumer) {};

        virtual T next() = 0;
 
    private:
        Consumer<T>* _current_consumer = nullptr;
 
    protected:
        Consumer<T>* current_consumer() const;
};
 
template <typename T>
T Producer<T>::next(const Consumer<T>* const consumer) {
    _current_consumer = consumer;
    return next();
}
 
template <typename T>
Consumer<T>* Producer<T>::current_consumer() const {
    return _current_consumer;
}
 
#endif // PRODUCER_H