Suppose you have two derived classesBandCthat have a common base classA, and you also have another classDthat inherits fromBandC. You can declare the base classAasvirtualto ensure thatBandCshare the same subobject ofA. In the following example, an object of classDhas two distinct subobjects...
The process of inheriting base classes virtual so that only a single copy of its member will appear in the derived class is called virtual inheritance. The corresponding shared base class is called a virtual base class. In the above example, using virtual inheritance, the duplication of members...
If the derived or inherited class does not define the pure virtual function, the compiler will not give an error, but the inherited class will also become an abstract class like the base class. The syntax of an abstract class in C++ is as follows: class className {public:virtual return_...
class derive: public base void f1() cout<<"F1Derive "; void f2( int x ) cout<<"F2Derive ";;int main() base obj1, * p; derive obj2; p = & obj2; p -> f1(); p -> f2(); return 0; 执行后的输出结果是 A.F1Derive F2BaseB.F1Derive F2DeriveC.F1Base F2BaseD.F1Base F2...
cout<<"MyFunction in Base class"<<endl; 复制 } alt 复制 }; 复制 void main() alt 复制 { 复制 DerivedClass *obj; alt 复制 obj->MyFunction(); 复制 } I am going to explain the virtual functions with the C++ example and will give some more additional code which will explain...
ApiErrorBase Object Api 错误基数。 展开表 名称类型说明 code string 错误代码。 message string 错误消息。 target string 特定错误的目标。 ApplicationProfile Object 指定应提供给 VM/VMSS 的库应用程序。 展开表 名称类型说明 galleryApplications VMGalleryApplication[] 指定应提供给 VM/VMSS 的库应用程序...
如果base class的destructor不是virtual,当其derived class作为基类使用,析构的时候derived class的数据成员将不会被销毁。 举个例子 我们有个交通工具的类作为基类, 它的析构函数不是virtual classtransportTool {public:~transportTool(); } 然后有一个汽车类继承它 ...
class CFoo2 : public CFoo { public: // virtual in base class too! virtual int CFoo2::GetVal() { return someOtherVal; } }; If pFoo is a pointer to a CFoo or CFoo2, then pFoo->GetVal will call the member function for whichever class pFoo really points toâ€"CFoo or CFoo2...
Only that's not really true. Let's take item (1) first: there are many cases in which a virtual function is resolved statically — essentially any time a derived class virtual method invokes the method of its base class(es). Why would one do that? Encapsulation. A good example is the...
This example prints the result: rBase is a Derived Tip Some modern compilers may give an error about having virtual functions and an accessible non-virtual destructor. If this is the case, add a virtual destructor to the base class. In the above program, add this to the definition of Ba...