timer.hpp
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// boost/chrono/timer.hpp ------------------------------------------------------------//
// Copyright Beman Dawes 2008
// Copyright 2009 Vicente J. Botet Escriba
// 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/system for documentation.
#ifndef BOOSTEX_CHRONO_TIMER_HPP
#define BOOSTEX_CHRONO_TIMER_HPP
#include <boost/chrono/chrono.hpp>
#include <boost/system/error_code.hpp>
namespace boost_ex
{
namespace chrono
{
//--------------------------------------------------------------------------------------//
// timer //
//--------------------------------------------------------------------------------------//
template <class Clock=boost::chrono::high_resolution_clock>
class timer
{
public:
typedef Clock clock;
typedef typename Clock::duration duration;
typedef typename Clock::time_point time_point;
explicit timer( boost::system::error_code & ec = ::boost::throws() )
{
start(ec);
}
~timer() {} // never throws
void start( boost::system::error_code & ec = ::boost::throws() )
{
m_start = clock::now( ec );
}
duration elapsed( boost::system::error_code & ec = ::boost::throws() )
{ return clock::now( ec ) - m_start; }
private:
time_point m_start;
};
typedef chrono::timer< boost::chrono::system_clock > system_timer;
#ifdef BOOST_CHRONO_HAS_CLOCK_STEADY
typedef chrono::timer< boost::chrono::steady_clock > steady_timer;
#endif
typedef chrono::timer< boost::chrono::high_resolution_clock > high_resolution_timer;
} // namespace chrono
} // namespace boost_ex
#endif