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Best way to store a reference to a class object.

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Hi I am trying to store a reference to a class object. Kind of like..
class A
{
}

class B
{
    // I want this to reference a already created A object
    A a;

    B(A a)
    {
      this.a = a;
    }
}
A a;
B b(a);
I am assuming this is not the way to do it but it gives you an idea of what I am trying to accomplish. Any suggestions Regards Chad

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What language?

For c++ you're close:

class A
{
};

class B
{
// I want this to reference a already created A object
A &a;

B(A &aIn)
: a(aIn)
{ }
};

A a;
B b(a);


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