Is using NULL references OK?

Question

I came across this code:

void f(const std::string &s);

And then a call:

f( *((std::string*)NULL) );

A

Answer 1

Is using NULL references OK?

No, unless you do not like your boss and your job ;)

This is something VERY bad. One of most important point of reference that it can't be NULL (unless you force it)