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3rdparty/boost_1_81_0/libs/chrono/example/timer.hpp 1.85 KB
e6ccf0ce   Hu Chunming   提交三方库
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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