C++: Throwing a derived class by reference does not work when catching base class

Question

I want to throw my own exceptions with the base class Exception. There is a virtual method print which will be overwritten by the subclasses. I onl

Answer 1

You can use a pointer instead of reference to avoid slicing:

int main(int argc, char **argv)
{
    try
    {
        IllegalArgumentException* pIAE = new IllegalArgumentException();
        throw pIAE;
    }
    catch(IllegalArgumentException* i)
        {
            i->print();
    }
}

The caught pointer points to the same object, because the copy constructor is not called implicitly.