How to use objects that got the private copy-constructor and assignment-constructor? [duplicate]

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Possible Duplicate:

How to use a object whose copy constructor and copy assignment is private?

In reading TCPL, I got a problem, as the title refered, and then 'private' class is:

class Unique_handle {
private:   
    Unique_handle& operator=(const Unique_handle &rhs);  
    Unique_handle(const Unique_handle &rhs); 
public:
    //...
} 

The using code is:

struct Y开发者_如何学Go {
    Unique_handle obj;
};

And I want to do such operations

main()
{
    Y y1;
    Y y2 = y1;
    return 0;
}

although, these code are come from TCPL, but I still can not got the solution... Can anybody help me, appreciate.

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Evidently you need "friend" declarations in that class, or that class already has static accessors that will create or even assign the instance you need.