protected member function
<streambuf> <iostream>
Advance get pointer
Adds n to the get pointer.
The get pointer (gptr) is the internal pointer that points to the current location in the array with the buffered portion of the controlled input sequence.
引數
- n
- Value by which to increase the get pointer.
This shall be a value such that gptr()+n is in the range between eback and egptr.
資料競爭
修改*流緩衝區*物件。
對同一流緩衝區物件的併發訪問可能導致資料競爭。
異常安全
基本保證：如果丟擲異常，*流緩衝區*處於有效狀態。
無效引數會導致未定義行為。