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https://github.com/parallel101/course/blob/8c890ba00bc452af8d66c419a27998297378679e/slides/design/game.md?plain=1#L1000 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
    }
};