12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273 |
- // await_keystroke.cpp -----------------------------------------------------//
- // Copyright Beman Dawes 2008
- // Distributed under the Boost Software License, Version 1.0.
- // See http://www.boost.org/LICENSE_1_0.txt
- #define _CRT_SECURE_NO_WARNINGS
- #include <boost/chrono/chrono.hpp>
- #include <iostream>
- #include <iomanip>
- using namespace boost::chrono;
- template< class Clock >
- class timer
- {
- typename Clock::time_point start;
- public:
- timer() : start( Clock::now() ) {}
- typename Clock::duration elapsed() const
- {
- return Clock::now() - start;
- }
- double seconds() const
- {
- return elapsed().count() * ((double)Clock::period::num/Clock::period::den);
- }
- };
- int main()
- {
- timer<system_clock> t1;
- timer<steady_clock> t2;
- timer<high_resolution_clock> t3;
- std::cout << "Strike any key: ";
- std::cin.get();
- std::cout << std::fixed << std::setprecision(9);
- std::cout << "system_clock-----------: "
- << t1.seconds() << " seconds\n";
- std::cout << "steady_clock--------: "
- << t2.seconds() << " seconds\n";
- std::cout << "high_resolution_clock--: "
- << t3.seconds() << " seconds\n";
- system_clock::time_point d4 = system_clock::now();
- system_clock::time_point d5 = system_clock::now();
- std::cout << "\nsystem_clock latency-----------: " << (d5 - d4).count() << std::endl;
- steady_clock::time_point d6 = steady_clock::now();
- steady_clock::time_point d7 = steady_clock::now();
- std::cout << "steady_clock latency--------: " << (d7 - d6).count() << std::endl;
- high_resolution_clock::time_point d8 = high_resolution_clock::now();
- high_resolution_clock::time_point d9 = high_resolution_clock::now();
- std::cout << "high_resolution_clock latency--: " << (d9 - d8).count() << std::endl;
- std::time_t now = system_clock::to_time_t(system_clock::now());
- std::cout << "\nsystem_clock::now() reports UTC is "
- << std::asctime(std::gmtime(&now)) << "\n";
- return 0;
- }
|