Observer.hh

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#ifndef OBSERVER_HH
#define OBSERVER_HH

namespace openmsx {

template <typename T> class Observer
{
public:
        virtual void update(const T& subject) = 0;
        virtual void subjectDeleted(const T& /*subject*/) { /*nothing*/ }

protected:
        ~Observer() = default;
};

} // namespace openmsx

#endif