In other words, a struct value can be assigned to a struct variable only if every field of the struct may be legally assigned individually by the program.
换句话说，如果想把一个结构体赋值给另一个结构体，就必须让该结构体的每一个成员变量都能被程序合法的赋值。
The iocb argument can usually be treated as an opaque cookie used by the AIO subsystem; if you need the struct file pointer for this file descriptor, however, you can find it as iocb->ki_filp.
通常可以把iocb看作AIO子系统使用的不透明数据结构。然而，如果需要文件描述符的structfile指针，可以通过iocb->ki_flip获取。
If your struct is immutable then all automatic copies resulting from being passed by value will be the same.
如果你的结构是不变的，然后从价值传递产生的所有自动副本将是相同的。
A given interface can be inherited and implemented by any class or struct.
指定的介面可以由任何类别或结构来继承和实作。
A given interface can be inherited and implemented by any class or struct.
指定的介面可以由任何类别或结构来继承和实作。
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