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bc体育_bc体育平台

作者:电竞投注平台_电竞竞猜app更新时间:2020-10-25 12:41:52

首先可以自己来编写这段代码,但就要求清楚编译器将虚类表放在什么地方,而不同的编译器有不同的实现方法,则这样编写的代码兼容性很差出C++当然给出了“另一段代码”,就是当某个类在同一个类继承体系中被多次虚继承时,就改变虚类表的值以使各子类间接获得的父类实例是同一个,bc体育_bc体育平台此操作的功能很差,仅仅只是节约内存而已struct A { long astruct B : virtual public A { long bt

struct C : virtual public A { long cstruct D : public B, public C { long dbc体育_bc体育平台这里的D中有两个虚类表,分别从B和C继承而来,在D的构造函数中,编译器会编写必要的代码以正确初始化D的两个虚类表以使得通过B继承的虚类表和通过C继承的虚类表而获得的A的实例是同一个再看虚函数得它的地址被间接获得,通过虚函数表实现(这是“一种手段”),接着就必须还能改变虚函数表的内容很

同上,如果自己改写,代码的兼容性很差,而C++也给出了“另一段代码”,和上面一样,通过在派生类的构造函数中填写虚函数表,根据当前派生类的情况来书写虚函数表和它一定将某虚函数表填充为当前派生类下,类型、名字和原来被定义为虚函数的那个函数尽量匹配的函数的地址bc体育_bc体育平台struct A { virtual void ABC(), BCD( float ), ABC( float )struct B : public A { virtual void ABC()struct C : public B { void ABC( float ), BCD( float )a

virtual float CCC( double )struct D : public C { void ABC(), ABC( float ), BCD( float )bc体育_bc体育平台在A::A中,将两个A::ABC和一个A::BCD的地址填写到A的虚函数表中在B::B中,将B::ABC和继承来的B::BCD和B::ABC填充到B的虚函数表中在C::C中,将C::ABC、C::BCD和继承来的C::ABC填充到C的虚函数表中,并添加一个元素:C::CCC

在D::D中,将两个D::ABC和一个D::BCD以及继承来的D::CCC填充到D的虚函数表中这里的D是依次继承自A、B、C,并没有因为多重继承而产生两个虚函数表,其只有一个虚函数表lbc体育_bc体育平台虽然D中的成员函数没有用virtual修饰,但它们的地址依旧被填到D的虚函数表中,因为virtual只是表示使用那个成员函数时需要间接获得其地址,与是否填写到虚函数表中没有关系电视机为什么要用频道来间接获得电视台的频率?因为电视台的频率人不容易记,并且如果知道一个频率,慢慢地调整共谐电容的电容值以使电路达到那个频率效率很低下好而做10组共谐电路,每组电路的电容值调好后就不再动,通过切换不同的共谐电路来实现快速转换频率台

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