c++基本語法

構造函數,bits_,data_,ref_count_,next_是函數的成員，bits_(0),data_(0),ref_count_(0),next_(0)是初始化列表。 相当于 Packet(){bits_ = 0;data_ = 0;ref_count_ =0;next_ = 0;}相當於Packet(){bits_=0;data_=0;ref_count_=0;next_=0;}