Re: C++ References

From:

Zara <yozara@terra.es>

Newsgroups:

comp.lang.c++.moderated

Date:

11 May 2006 18:53:15 -0400

Message-ID:

<7hh562dv5h04phmi252q8v7tacfotvvbak@4ax.com>

On 10 May 2006 17:02:31 -0400, "onkar" <onkar.n.m@gmail.com> wrote:

I want bi to change as soon as i change ai. How to accomplish this
using references ?

#include<iostream>
using namespace std;
class B
{
       private:
               int bi;
       public:
               B()
               {
                       bi=10;
               }
               int& get_bi()
               {
                       return bi;
               }
               void display()
               {
                       cout<<"bi = "<<bi<<endl;
               }
};
class A
{
       private:
               B b;
               int ai;

chage to:
int& ai;
So that it really is a reference, not a value by itself

       public:
               A()
               {
                       ai=b.get_bi();
               }

change to:
a():ai(b.get_bi()) {}
The reference must be initialized on the constructor list, or you
should get an error from the compiler. From now on, any change to ai
will change the value of the object referred by ai (in this case, bi).

               void assign(int i)
               {
                       ai=i;
               }
               void display()
               {
                       cout<<"ai = "<<ai<<endl;
               }
};

<...>

Regards,

Zara

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