#include <iostream>
#include <exception>
#include <string>
#include <chrono>
#include <thread>

#include <boost/chrono/process_cpu_clocks.hpp>


int main ( void )
{try{

	boost::chrono::process_cpu_clock clock;
	boost::chrono::process_cpu_clock::time_point b = clock.now();
	std::this_thread::sleep_for( std::chrono::seconds( 2 ) );
	boost::chrono::process_cpu_clock::time_point e = clock.now();
	boost::chrono::process_cpu_clock::duration d = e - b;

	auto times = d.count(); 	
	std::cout << times.real / 1e+9 << std::endl;
	std::cout << times.user / 1e+9 << std::endl;
	std::cout << times.system / 1e+9 << std::endl;

	return 0;
}
catch ( const std::exception& e )
{
	std::cerr << std::endl
			<< "std::exception(\"" << e.what() << "\")." << std::endl;
}
catch ( ... )
{
	std::cerr  << std::endl
			<< "unknown exception." << std::endl;
}}