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访问者设计模式缺少继承 #35

Description

@CrossroadW

struct MoveMessage {

修改为:

struct MoveMessage :Message{
    glm::vec3 velocityChange;

    void accept(MessageVisitor *visitor) override {
        visitor->visit(this);  // 会调用到 visit(MoveMessage *mm) 这个重载
    }
};

struct JumpMessage :Message{
    double jumpHeight;

    void accept(MessageVisitor *visitor) override {
        visitor->visit(this);  // 会调用到 visit(JumpMessage *mm) 这个重载
    }
};

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