[Solved] Derived class’s method without constructor [duplicate]

by


You cannot. Your code has an undefined behavior. If I modify the main() function to:

int main()
{
    Person *p = new Person();
    Developer* d = dynamic_cast<Developer*>(p);
    assert(d!=0);
    d->Pi();

    delete p;
    delete d;
    return 0;
}

Then the assertion d!=0 is triggered. That shows that the dynamic_cast failed. You call Developer::Pi on a null pointer, and using your compiler it happens to run fine, probably because Developer::Pi does not use this.

1

solved Derived class’s method without constructor [duplicate]