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Tuesday, April 21, 2015

deleting base class ptr -- non-virt dtor

This correct code produces " ~B ~A" i.e. reverse construction sequence. But what if "virtual" removed?

 

I said it's undefined behavior, but what if we know it does do something? I correctly predicted " ~A". My bloomberg interviewer predicted " ~B" but failed my test.

 

class A{

public: virtual ~A(){ cout<<" ~ A"<<endl; }

};

class B: public A{

public: ~B(){ cout<<" ~ B "; }

};

int main(){

    A * p = new B;

    delete p;

    cin.get();

}