Static member variable. xml

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Static member variable

1. static member functions can only access static variables because static variables do not include the this pointer.

2 static member variables ?? It is not only shared by all objects of the class, but also shared by objects of the derived class.

Example:

?class?base{public:?????????static?int?num;};?int?base::num=0;?class?derived:public?base{};??????????base?a;?????????derived?b;?????????a.num++;?????????cout<<a.num<<endl;??????????b.num++;?????????cout<<b.num<<endl;?

3? A static member of a class can be an optional parameter of a member function, but a common member cannot.

Example:

Class? Base {? Public :????????? Static? Int? Num ;?????????? Int? VaR ;?????????? Void? F1 (Int? I = num );?? //? Correct ????????? Void? F2 (Int? I = var );?? //? Error };?

4? A static member of a class can be of the class type, but a common member cannot. A common member can only be declared as a pointer or reference of the class type.

? Class? Base {? Public :????????? Static? Base? Num ;?????????? Base? VaR ;? //? Error ?????????? Base? * Pbase ;?????????? Base? & Mybase ;};

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Static member variable. xml