[julia-users] ho to pass a bitstype by reference?

[Carlo Lucibello]

Hi julians,
I'd like to emulate the following behaviour from C++

class A{
public:
    double x;
}

class B{
public:
    double& x;
}
A a(1);
B b(a.x);
a.x=2;
assert(b.x == 2);

Whilie it would be easy to obtain this behaviour with `composite` types, 
since they are passed by referece, for elementary types, such as Float64, 
thi is not possible since they have a sort of by vlue semantic (yes, I know 
it's not exactly like that, but still...)

Greetings, 
Carlo