Merge branch 'liuyang' into clh

LAPTOP-SNT8I5JK\Boounion

2024-12-12 016703bb359382dc1de4ac204da47b6f29c55c81

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