Thread: pointers for class

I cant make print virtual and I must use pub pointer I try with reintrepret_cast but it doesnt work

Making print virtual is the correct approach. If you cannot change the base class, then it implies that print was not meant to be overriden in the first place, so what is ask for is not only (pretty much) impossible, but also 'immoral'.

this should reinterpret p1 and make it man pointer or not?

No, that interprets it as a man object, not pointer. What you are looking for is reinterpret_cast<man*>, though better would be static_cast<man*>. In that respect I was probably wrong to call it "(pretty much) impossible", though it is definitely not the correct approach.

Yes the compiler let me do this but the result is that is called the print function from class pub,I tried and static_cast and I get the same result...

You can try:

Code:

#include <iostream>

class pub
{
public:
    void print()
    {
        std::cout << "pub::print()" << std::endl;
    }
};

class man : public pub
{
public:
    void print()
    {
        std::cout << "man::print()" << std::endl;
    }
};

int main()
{
    pub* p1 = new man;
    static_cast<man*>(p1)->print();
    delete p1;
    return 0;
}

But of course the better solution is:

Code:

#include <iostream>

class pub
{
public:
    virtual void print()
    {
        std::cout << "pub::print()" << std::endl;
    }
};

class man : public pub
{
public:
    void print()
    {
        std::cout << "man::print()" << std::endl;
    }
};

int main()
{
    pub* p1 = new man;
    p1->print();
    delete p1;
    return 0;
}

You might consider making print() const.