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konsta · Guest

Hi all,
I'd like to have a base class P (say a person) that has a pointer to
another class C (say a car) and then a class M (say manager) which is
a derived class of P that has a pointer to a class R (say Rolls Royce)
which is a derived class of C. The assumption is that all M's will
have pointers to C's which are at least R's.

What's the best way of accomplishing this? Can I e.g. in the
definition of M just define a member variable R* which has the same
name as the C* in the definition of P?

At least Visual C++ seems to think the code below is OK (and
furthermore even automatic statement completion works) but I want to
make sure it is portable. Which version of p_ will be given by a class
(i.e. if m is a variable of type M will m.p_ refer to M::p_ and not
P::p_)? Thanks!

#include <iostream>
#include <string>

using namespace std;

struct car{
car(){};
virtual void brand(){ cout << "carn";}
};

struct rollsroyce: public car{
rollsroyce( long code = 17): her_majestys_secret_code_( code){};
virtual void brand(){ cout << "Rolls Roycen";}
long her_majestys_secret_code_;
};

struct person{
person( car* p): p_( p){};
car* p_;
virtual void make_of_car(){ p_->brand();}
};

struct manager: public person{
manager( rollsroyce* p): person( p){
p_ = p;};
rollsroyce* p_;
};

int main(int argc, char* argv[])
{
car c;
rollsroyce r;

manager m = manager( &r);
m.make_of_car(); // prints out "Rolls Royce"
m.p_->her_majestys_secret_code_ = 17; // ok

return 0;
}

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Thomas Mang · Guest

"konsta" <uniquecomb (AT) yahoo (DOT) com> schrieb im Newsbeitrag
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