[boost] singleton streams?

From: Jason Hise (chaos_at_[hidden])
Date: 2005-02-15 23:11:49

 From everything I know, cin, cout, cerr, and clog are simply global 
variables that live in namespace std.  Does this mean that the following 
code is dangerous?

class Log
{
public:
    Log (  ) { std::clog << "Log created\n"; }
    ~ Log (  ) { std::clog << "Log destroyed\n"; }
} global_log;

If so, (and I know this is presumptuous, so strictly hypothetically 
speaking) could these four standard streams benefit by becoming 
singletons?  Just a thought experiment...

-Jason