Pitfalls of C + + virtual functions

First look at a piece of code:

1 classB2 {    3  Public:   4     Virtual voidFuninti =1)      5     {     6Std::cout <<"base fun called,"<<i; 7     }; 8 }; 9 Ten classB | PublicB One {     A Private:     -     Virtual voidFuninti =2)       -     {      theStd::cout <<"driver Fun called,"<<i;  -     };  -};

If you do the following:

b* p = new D ();
P->fun ();
Will output driver fun called, 1

There are two questions:

(1) The virtual function of a subclass is called externally even if it is declared as a private function.

(2) Although the virtual function is dynamically bound, the default parameter value is statically bound.

These two points must pay attention to AH!!

Pitfalls of C + + virtual functions