C Puzzles ★1.有如下代码,问:ptr指向了谁?能通过ptr调用Derived类重写的函数吗(即多态还起作用吗)?dynamic_cast到底是什么作用?ptr2与ptr性质是一样的吗?
Derived* derived new …
hive 异常 (Attempt to do update or delete on table terminal that does not use an ) hive > delete from terminal where 11 ; 出现以下 FAILED: SemanticException [Error 10297]: Attempt to do update or delete on table terminal that doe…