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// boost/chrono/stopwatches/simple_stopwatch.hpp ------------------------------------------------------------//
// Copyright 2011 Vicente J. Botet Escriba
// Copyright (c) Microsoft Corporation 2014
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/libs/chrono/stopwatches for documentation.
#ifndef BOOST_CHRONO_STOPWATCHES_SIMPLE_STOPWATCH__HPP
#define BOOST_CHRONO_STOPWATCHES_SIMPLE_STOPWATCH__HPP
#include <boost/chrono/config.hpp>
#include <boost/chrono/chrono.hpp>
#include <boost/system/error_code.hpp>
#include <boost/chrono/thread_clock.hpp>
#include <boost/chrono/process_cpu_clocks.hpp>
#include <utility>
namespace boost
{
namespace chrono
{
/**
* This class provides the simpler stopwatch which is just able to give the elapsed time since its construction.
*/
template<typename Clock=high_resolution_clock>
class simple_stopwatch
{
public:
typedef Clock clock;
typedef typename Clock::duration duration;
typedef typename Clock::time_point time_point;
typedef typename Clock::rep rep;
typedef typename Clock::period period;
BOOST_STATIC_CONSTEXPR bool is_steady = Clock::is_steady;
simple_stopwatch() :
start_(clock::now())
{
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
explicit simple_stopwatch(system::error_code & ec) :
start_(duration::zero())
{
time_point tmp = clock::now(ec);
if (!BOOST_CHRONO_IS_THROWS(ec))
{
if (ec)
{
return;
}
}
start_ = tmp;
}
#endif
~simple_stopwatch() BOOST_NOEXCEPT
{
}
duration elapsed()
{
return clock::now() - start_;
}
#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
duration elapsed(system::error_code & ec) BOOST_NOEXCEPT
{
time_point tmp = clock::now(ec);
if (!BOOST_CHRONO_IS_THROWS(ec))
{
if (ec)
return duration::zero();
}
return tmp - start_;
}
#endif
private:
time_point start_;
simple_stopwatch(const simple_stopwatch&); // = delete;
simple_stopwatch& operator=(const simple_stopwatch&); // = delete;
};
typedef simple_stopwatch<system_clock> system_simple_stopwatch;
#ifdef BOOST_CHRONO_HAS_CLOCK_STEADY
typedef simple_stopwatch<steady_clock> steady_simple_stopwatch;
#endif
typedef simple_stopwatch<high_resolution_clock> high_resolution_simple_stopwatch;
#if defined(BOOST_CHRONO_HAS_PROCESS_CLOCKS)
typedef simple_stopwatch<process_real_cpu_clock> process_real_cpu_simple_stopwatch;
#if ! BOOST_OS_WINDOWS || BOOST_PLAT_WINDOWS_DESKTOP
typedef simple_stopwatch<process_user_cpu_clock> process_user_cpu_simple_stopwatch;
typedef simple_stopwatch<process_system_cpu_clock> process_system_cpu_simple_stopwatch;
typedef simple_stopwatch<process_cpu_clock> process_cpu_simple_stopwatch;
#endif
#endif
#if defined(BOOST_CHRONO_HAS_THREAD_CLOCK)
typedef simple_stopwatch<thread_clock> thread_simple_stopwatch;
#endif
} // namespace chrono
} // namespace boost
#endif
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