StateChange.hh

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#ifndef STATECHANGE_HH
#define STATECHANGE_HH
 
#include "EmuTime.hh"
#include "serialize_meta.hh"
 
namespace openmsx {
 
// TODO:
//  See commit '2b0c6cf467d510' for how to turn this class hierarchy into
//  std::variant. That saves a lot of heap-memory allocations.  Though we
//  reverted that commit because it triggered internal compiler errors in msvc.
//  In the future, when msvc gets fixed, we can try again.
 
class StateChange
{
public:
        virtual ~StateChange() = default; // must be polymorphic
 
        [[nodiscard]] EmuTime::param getTime() const
        {
                return time;
        }
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned /*version*/)
        {
                ar.serialize("time", time);
        }
 
protected:
        StateChange() : time(EmuTime::zero()) {} // for serialize
        explicit StateChange(EmuTime::param time_)
                : time(time_)
        {
        }
 
private:
        EmuTime time;
};
REGISTER_BASE_CLASS(StateChange, "StateChange");
 
} // namespace openmsx
 
#endif