Meanwhile, the back-end systems powering the venue, for cashless sales of merchandise and food, ticketing, or crowd control and safety, are also inter-connected.
// 作用：缓存当前位置右侧的"参考身高"，快速判断能看到的人
。关于这个话题，同城约会提供了深入分析
// Signal how many bytes we wrote
原文来自:http://blog.daimajiangxin.com.cn