朋友与朋友之间的区别是什么? 以及应当如何使用朋友的关键词?
I m getting this linker error. I know a way around it, but it s bugging me because another part of the project s linking fine and it s designed almost identically. First, I have namespace LCD. Then I ...
朋友与朋友之间的区别是什么? 以及应当如何使用朋友的关键词?
简言之,一个等级和一个职能。 就职能而言,只有一项职能能够接触到私人成员。 对于一个班级,整个班级及其所有职能都能够接触友好班的私人成员。
朋友的关键词被用来允许接触私人数据成员。 有时,你可能需要一个助手班或一个补习班,以接触不同类别的私人成员。 就职能而言,一个常见的例子就是经营者超负荷工作。 或许,你想要超载+运营商。 您可以将操作员+功能宣布到该类别之外(因此可以不必标出),并且需要查阅私人类别的数据。
查阅,该网址详细描述这两个网站及其使用方式。
friend
keyword is used for declaration.friend
keyword is not required.friend
keyword is used: friend class a;
friend
keyword is not required.friend
class we can access the members of one class into another.A friend function is used for accessing the non public member of a class.A class can allow non-member function and other classes to access its own private data by making them friend A Friend class has full access of private data members of another class without being member of that class.
(1) 用户功能用于获取使用成员功能的私人数据变量的同一类别。
2)u 可以把朋友的职能放在主要职能中,没有任何目标,但只要求成员履行职务,才需要创建同一类的目标。
3) 朋友的职能可以被视为非成员的职能,但成员的职能不被视为非成员职务。
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