Ok, let's take this a step further:

template<typename T1, typename T2>
void swap(T1& x, T2& y)
{
    T1 tmp = x;
    x = y;
    y = tmp;
}

  And suppose we have:

class B;

class A
{
 public:
    A& operator=(const B&);
}

class B
{
 public:
    B& operator=(const A&);
}

int main()
{
    A a;
    B b;
    swap(a,b);
}

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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