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