Re: C++ Object and Class *****

"Daniel T." <>
Mon, 22 Mar 2010 17:24:01 -0400
In article
 Kumar Anurag <> wrote:

On Mar 22, 11:36?pm, "" <>

On Mar 22, 2:18?pm, Kumar Anurag <> wrote:

Implement a class which can only have two objects e.g. obj1,obj2.Now
when obj3 is created ,then obj1 should get destroyed.. This process
will be repeated . It means at any instant we will have only two
I did is using copy constructor is it right??

using namespace std;

class A{

? public:
? ? ?A(A& Old){
? ? ? ?Old.~A();//here we destroyed the old object2("b")
? ? ? ?}


int main()
?A a; //Object1
?A b; //Object2
?A c(b);//Suppose i want to create object3 "c"
? ? ? ? //Here we pass that object in parameter which we want to get
? ? ? ? //Destroyed (here i want Object2("b") to get destroyed;

return 0;}

/*whenever i need to create new object i will pass as
Format:-> A newObject(oldObject);

is it correct??/

At the very least, you can't do this with objects that have been
allocated on the stack. ?When you exit scope, I think your b instance
will be destructed a second time.

Perhaps you can do this for heap allocated objects, but I would ask
what are you really trying to accomplish?

Suppose we have a game in which only 2 players can play at a time. Now
3rd player wants to enter, then one of them should leave , and the 3rd
player will take the place. Players are here instances (objects) .How
this can be done??

You can re-initialize one of your objects by giving it a reset
member-function or using the assignment operator:

int main() {
   A a;
   A b;
   // use 'b' for awhile, then it's time to replace it:
   b = A();
   // or

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