#include <boost/chrono/stopwatches.hpp>
#include <iostream>

using namespace std;

int main()
{
   { boost::chrono::stopclock<> stopclock(std::cerr); }

   { boost::chrono::stopclock<> stopclock; }

   { boost::chrono::stopclock<> stopclock(BOOST_CURRENT_FUNCTION); }

   { boost::system::error_code ec; 
     boost::chrono::stopclock<> stopclock(std::cerr, ec); }
}