C ++: Why static member functions cannot access non-static members

The key point is that static member functions are only related to types, but not objects!

In this way, we can see that the fundamental difference between a static member function and a non-static member function is that a static member function does not have the this pointer because it does not have an object, A non-static member function has a pointer to the current object.

Example:

Class

{

Public:

Void notstaticfunc (int );

Static void staticfunc (int );

}

 

Void F (A & S)

{

S. notstaticfunc (100); // compile according to a: notstaticfunc (& S, 100), take the address of s as the first parameter.

S. staticfunc (100); // I 'd better write it as a: staticfunc (100); to indicate that the object is irrelevant.

}