c++ - How to pass ostream objects? -


i have struct this

struct x{     ostream out;     x() : out(cout) {}     ... };

and noticed have define out & correctly pass cout default parameter: ostream &out; don't know why , don't know if there other possibilities keeping ostream without &. furthermore, when try set 

x x; ofstream out; x.out = out;

the compiler found many errors... want able set x::out cout or ofstream. how it?

ostreams cannot passed value. have pass reference or pointer.

if want ability make x.out refer different streams during lifetime, make pointer. otherwise make reference.


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