ceph/src/boost/boost/sort/common/time_measure.hpp

   1 //----------------------------------------------------------------------------
   2 /// @file time_measure.hpp
   3 /// @brief This class is done in order to simplify the time measure in the
   4 ///        benchmaark programs
   5 ///
   6 /// @author Copyright (c) 2010 2015 Francisco José Tapia (fjtapia@gmail.com )\n
   7 ///         Distributed under the Boost Software License, Version 1.0.\n
   8 ///         ( See accompanyingfile LICENSE_1_0.txt or copy at
   9 ///           http://www.boost.org/LICENSE_1_0.txt  )
  10 /// @version 0.1
  11 ///
  12 /// @remarks
  13 //-----------------------------------------------------------------------------
  14 #ifndef __BOOST_SORT_PARALLEL_TOOLS_TIME_MEASURE_HPP
  15 #define __BOOST_SORT_PARALLEL_TOOLS_TIME_MEASURE_HPP
  16
  17 #include <chrono>
  18
  19 namespace boost
  20 {
  21 namespace sort
  22 {
  23 namespace common
  24 {
  25
  26 namespace chrn = std::chrono;
  27 //
  28 //***************************************************************************
  29 //                D E F I N I T I O N S
  30 //***************************************************************************
  31 typedef chrn::steady_clock::time_point           time_point;
  32
  33 time_point now ( );
  34 double subtract_time  ( const time_point & t1, const time_point & t2 );
  35 //
  36 //---------------------------------------------------------------------------
  37 //  function : now
  38 /// @brief return the time system in a internal format ( steady_clock)
  39 /// @return time in steady_clock format
  40 //---------------------------------------------------------------------------
  41 time_point now ( ) {   return chrn::steady_clock::now( ); };
  42 //
  43 //---------------------------------------------------------------------------
  44 //  function : subtract_time
  45 /// @brief return the time in double format
  46 /// @param [in] t1 : first  time in time_point format
  47 /// @param [in] t2 : second time in time_point format
  48 /// @return time in seconds of the difference of t1 - t2
  49 //---------------------------------------------------------------------------
  50 double subtract_time  ( const time_point & t1, const time_point & t2 )
  51 {   //------------------------ begin ---------------------------------
  52     chrn::duration<double> time_span =
  53                 chrn::duration_cast < chrn::duration < double > > ( t1 - t2 );
  54     return  time_span.count( );
  55 };
  56
  57 //***************************************************************************
  58 };//    End namespace benchmark
  59 };//    End namespace sort
  60 };//    End namespace boost
  61 //***************************************************************************
  62 #endif