C ++中的Java / C#切片 [英] C++ slicing in Java / C#
问题描述
CAN C ++切片适用于其他语言也一样,如Java / C#?
Can C++ slicing apply to other languages too, like Java/C#?
推荐答案
切片也就是说,如果您分配一个子类实例一个超类的变量,由子类包含的额外信息是切片关,因为超变量没有多余的空间来存储子类的此额外信息。
Slicing means that if you assign a subclass instance to a superclass variable, the extra information contained by subclass is "sliced" off, because the superclass variable doesn't have the extra space to store this extra information of the subclass.
这不会在Java中也没有与C#发生,因为所有的对象变量引用;当你指定一个子类的实例,以一个超类变量,你实际上只是复制参考;子类对象本身保持不变。
This doesn't happen in Java nor with C#, because all object variables are references; when you assign a subclass instance to a superclass variable, you actually just copy the reference; the subclass object itself remains intact.
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