Merge branch 'clh' into liuyang

LAPTOP-T815PCOQ\25526

2024-12-10 47718a637fa239dcbec0fffca736f3c3b1cf7887

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#pragma once
 
class IObserver
{
public:
    virtual void setPriority(int nPriority) = 0;
    virtual void subscribe() = 0;
    virtual void unsubscribe() = 0;
};