企业官网建设流程全解析

北京企业网站设计报价,快速注销公司需3天,在线学习网站模板,小程序开发流程详细、友元友元在前面文章IO流的输出输出重载的地方用过一次1.1 友元函数友元提供了一种突破类访问限定符封装的方式#xff08;类的访问限定符在类里可以访问#xff0c;但是在类外就不能访问了#xff09;#xff0c;友元分为#xff1a;友元函数和友元类#xff08;一个类…、友元友元在前面文章IO流的输出输出重载的地方用过一次1.1 友元函数友元提供了一种突破类访问限定符封装的方式类的访问限定符在类里可以访问但是在类外就不能访问了友元分为友元函数和友元类一个类去访问另外一个类中的成员在函数声明或者类声明的前面加friend并且把友元声明放到一个类的里面这里有两个类AB此时有一个函数既要访问A也要访问B就要使用友元了一个函数是能够成为多个类的友元的在这里插入图片描述如图函数内就可以访问AB的私有或者保护了但是这里代码编译不通过。不通过是前置声明的问题在用任何的变量函数类型的时候都要在当前位置的前面声明或定义了后面才能用因为编译器是向上编译检查的节省编译时间同时向上向下查找出处浪费时间图中A类中的形参B向上找的时候找不到也就是AB类之间存在相互依赖。 解决方法就是加一个类的前置声明在这里插入图片描述1.2 友元类图中D这个类要大量的访问C这个类的私有。虽然可以把D中的成员函数声明为C的友元但是成员函数多的时候很麻烦就有了一种更简单粗暴的方法友元类在这里插入图片描述友元不是相互的友元是一种单向关系D成为了C的友元在D中可以访问C但在C中是无法访问D的除非在D中加C的友元声明是可以互相成为友元的在这里插入图片描述但是这样还是编译不通过的虽然前置声明了D的类型但只能解决用D这个类型但是D里面的细节如成员变量还是不能用的(D中有无_b这个成员编译器是不知道的)而且这里也不需要前置声明已经友元声明D是一个类了这时候就要做声明和定义分离map.wdoywhx.cn/Blog/464682.shtmlmap.wdoywhx.cn/Blog/979319.shtmlmap.wdoywhx.cn/Blog/595933.shtmlmap.wdoywhx.cn/Blog/646066.shtmlmap.wdoywhx.cn/Blog/200268.shtmlmap.wdoywhx.cn/Blog/608282.shtmlmap.wdoywhx.cn/Blog/260286.shtmlmap.wdoywhx.cn/Blog/951515.shtmlmap.wdoywhx.cn/Blog/353917.shtmlmap.wdoywhx.cn/Blog/588957.shtmlmap.wdoywhx.cn/Blog/640086.shtmlmap.wdoywhx.cn/Blog/375519.shtmlmap.wdoywhx.cn/Blog/537173.shtmlmap.wdoywhx.cn/Blog/137371.shtmlmap.wdoywhx.cn/Blog/242828.shtmlmap.wdoywhx.cn/Blog/460406.shtmlmap.wdoywhx.cn/Blog/886844.shtmlmap.wdoywhx.cn/Blog/624888.shtmlmap.wdoywhx.cn/Blog/575731.shtmlmap.wdoywhx.cn/Blog/957357.shtmlmap.wdoywhx.cn/Blog/311597.shtmlmap.wdoywhx.cn/Blog/802246.shtmlmap.wdoywhx.cn/Blog/997739.shtmlmap.wdoywhx.cn/Blog/222000.shtmlmap.wdoywhx.cn/Blog/222266.shtmlmap.wdoywhx.cn/Blog/882660.shtmlmap.wdoywhx.cn/Blog/048720.shtmlmap.wdoywhx.cn/Blog/848204.shtmlmap.wdoywhx.cn/Blog/511393.shtmlmap.wdoywhx.cn/Blog/999397.shtmlmap.wdoywhx.cn/Blog/991399.shtmlmap.wdoywhx.cn/Blog/064266.shtmlmap.wdoywhx.cn/Blog/353391.shtmlmap.wdoywhx.cn/Blog/824242.shtmlmap.wdoywhx.cn/Blog/284460.shtmlmap.wdoywhx.cn/Blog/511195.shtmlmap.wdoywhx.cn/Blog/397555.shtmlmap.wdoywhx.cn/Blog/228842.shtmlmap.wdoywhx.cn/Blog/048622.shtmlmap.wdoywhx.cn/Blog/115113.shtmlmap.wdoywhx.cn/Blog/888840.shtmlmap.wdoywhx.cn/Blog/117355.shtmlmap.wdoywhx.cn/Blog/397157.shtmlmap.wdoywhx.cn/Blog/775993.shtmlmap.wdoywhx.cn/Blog/119731.shtmlmap.wdoywhx.cn/Blog/131179.shtmlmap.wdoywhx.cn/Blog/719955.shtmlmap.wdoywhx.cn/Blog/828644.shtmlmap.wdoywhx.cn/Blog/600268.shtmlmap.wdoywhx.cn/Blog/848664.shtmlmap.wdoywhx.cn/Blog/480604.shtmlmap.wdoywhx.cn/Blog/400024.shtmlmap.wdoywhx.cn/Blog/468640.shtmlmap.wdoywhx.cn/Blog/886400.shtmlmap.wdoywhx.cn/Blog/577737.shtmlmap.wdoywhx.cn/Blog/975571.shtmlmap.wdoywhx.cn/Blog/202200.shtmlmap.wdoywhx.cn/Blog/159377.shtmlmap.wdoywhx.cn/Blog/202080.shtmlmap.wdoywhx.cn/Blog/262006.shtmlmap.wdoywhx.cn/Blog/739313.shtmlmap.wdoywhx.cn/Blog/935595.shtmlmap.wdoywhx.cn/Blog/866806.shtmlmap.wdoywhx.cn/Blog/006664.shtmlmap.wdoywhx.cn/Blog/735595.shtmlmap.wdoywhx.cn/Blog/600466.shtmlmap.wdoywhx.cn/Blog/286648.shtmlmap.wdoywhx.cn/Blog/319517.shtmlmap.wdoywhx.cn/Blog/555793.shtmlmap.wdoywhx.cn/Blog/622244.shtmlmap.wdoywhx.cn/Blog/711195.shtmlmap.wdoywhx.cn/Blog/600644.shtmlmap.wdoywhx.cn/Blog/868046.shtmlmap.wdoywhx.cn/Blog/537579.shtmlmap.wdoywhx.cn/Blog/200862.shtmlmap.wdoywhx.cn/Blog/884082.shtmlmap.wdoywhx.cn/Blog/662002.shtmlmap.wdoywhx.cn/Blog/826882.shtmlmap.wdoywhx.cn/Blog/620200.shtmlmap.wdoywhx.cn/Blog/175777.shtmlmap.wdoywhx.cn/Blog/971951.shtmlmap.wdoywhx.cn/Blog/555591.shtmlmap.wdoywhx.cn/Blog/820242.shtmlmap.wdoywhx.cn/Blog/131119.shtmlmap.wdoywhx.cn/Blog/462606.shtmlmap.wdoywhx.cn/Blog/686800.shtmlmap.wdoywhx.cn/Blog/573195.shtmlmap.wdoywhx.cn/Blog/244600.shtmlmap.wdoywhx.cn/Blog/133935.shtmlmap.wdoywhx.cn/Blog/977977.shtmlmap.wdoywhx.cn/Blog/971179.shtmlmap.wdoywhx.cn/Blog/937713.shtmlmap.wdoywhx.cn/Blog/971331.shtmlmap.wdoywhx.cn/Blog/735513.shtmlmap.wdoywhx.cn/Blog/684422.shtmlmap.wdoywhx.cn/Blog/240280.shtmlmap.wdoywhx.cn/Blog/597773.shtmlmap.wdoywhx.cn/Blog/515593.shtmlmap.wdoywhx.cn/Blog/488628.shtmlmap.wdoywhx.cn/Blog/157591.shtmlmap.wdoywhx.cn/Blog/088082.shtmlmap.wdoywhx.cn/Blog/624846.shtmlmap.wdoywhx.cn/Blog/442820.shtmlmap.wdoywhx.cn/Blog/951311.shtmlmap.wdoywhx.cn/Blog/537535.shtmlmap.wdoywhx.cn/Blog/377579.shtmlmap.wdoywhx.cn/Blog/535119.shtmlmap.wdoywhx.cn/Blog/002026.shtmlmap.wdoywhx.cn/Blog/680408.shtmlmap.wdoywhx.cn/Blog/442882.shtmlmap.wdoywhx.cn/Blog/771393.shtmlmap.wdoywhx.cn/Blog/660406.shtmlmap.wdoywhx.cn/Blog/804486.shtmlmap.wdoywhx.cn/Blog/711351.shtmlmap.wdoywhx.cn/Blog/040080.shtmlmap.wdoywhx.cn/Blog/391951.shtmlmap.wdoywhx.cn/Blog/664208.shtmlmap.wdoywhx.cn/Blog/648220.shtmlmap.wdoywhx.cn/Blog/319393.shtmlmap.wdoywhx.cn/Blog/882080.shtmlmap.wdoywhx.cn/Blog/464422.shtmlmap.wdoywhx.cn/Blog/042266.shtmlmap.wdoywhx.cn/Blog/359155.shtmlmap.wdoywhx.cn/Blog/280600.shtmlmap.wdoywhx.cn/Blog/824084.shtmlmap.wdoywhx.cn/Blog/519359.shtmlmap.wdoywhx.cn/Blog/002884.shtmlmap.wdoywhx.cn/Blog/315715.shtmlmap.wdoywhx.cn/Blog/551335.shtmlmap.wdoywhx.cn/Blog/648266.shtmlmap.wdoywhx.cn/Blog/488482.shtmlmap.wdoywhx.cn/Blog/191913.shtmlmap.wdoywhx.cn/Blog/575919.shtmlmap.wdoywhx.cn/Blog/115793.shtmlmap.wdoywhx.cn/Blog/862628.shtmlmap.wdoywhx.cn/Blog/662044.shtmlmap.wdoywhx.cn/Blog/195133.shtmlmap.wdoywhx.cn/Blog/604222.shtmlmap.wdoywhx.cn/Blog/193391.shtmlmap.wdoywhx.cn/Blog/193573.shtmlmap.wdoywhx.cn/Blog/955751.shtmlmap.wdoywhx.cn/Blog/713919.shtmlmap.wdoywhx.cn/Blog/135139.shtmlmap.wdoywhx.cn/Blog/553737.shtmlmap.wdoywhx.cn/Blog/535751.shtmlmap.wdoywhx.cn/Blog/664242.shtmlmap.wdoywhx.cn/Blog/644008.shtmlmap.wdoywhx.cn/Blog/268088.shtml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