stopwatch.h

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00001 /** @file rutz/stopwatch.h track elapsed wall-clock time */
00002 
00003 ///////////////////////////////////////////////////////////////////////
00004 //
00005 // Copyright (c) 1999-2004 California Institute of Technology
00006 // Copyright (c) 2004-2007 University of Southern California
00007 // Rob Peters <rjpeters at usc dot edu>
00008 //
00009 // created: Thu Nov 18 10:24:59 1999
00010 // commit: $Id: stopwatch.h 8249 2007-04-12 06:03:40Z rjpeters $
00011 // $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/rutz/stopwatch.h $
00012 //
00013 // --------------------------------------------------------------------
00014 //
00015 // This file is part of GroovX.
00016 //   [http://ilab.usc.edu/rjpeters/groovx/]
00017 //
00018 // GroovX is free software; you can redistribute it and/or modify it
00019 // under the terms of the GNU General Public License as published by
00020 // the Free Software Foundation; either version 2 of the License, or
00021 // (at your option) any later version.
00022 //
00023 // GroovX is distributed in the hope that it will be useful, but
00024 // WITHOUT ANY WARRANTY; without even the implied warranty of
00025 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00026 // General Public License for more details.
00027 //
00028 // You should have received a copy of the GNU General Public License
00029 // along with GroovX; if not, write to the Free Software Foundation,
00030 // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
00031 //
00032 ///////////////////////////////////////////////////////////////////////
00033 
00034 #ifndef GROOVX_RUTZ_STOPWATCH_H_UTC20050626084019_DEFINED
00035 #define GROOVX_RUTZ_STOPWATCH_H_UTC20050626084019_DEFINED
00036 
00037 #include "rutz/time.h"
00038 
00039 namespace rutz
00040 {
00041   class stopwatch;
00042 }
00043 
00044 /// Tracks elapsed wall-clock time.
00045 class rutz::stopwatch
00046 {
00047 public:
00048   /// Default constructor.
00049   stopwatch() : m_start_time() { restart(); }
00050 
00051   /// Reset the start time to the current time.
00052   void restart()
00053     { m_start_time = rutz::time::wall_clock_now(); }
00054 
00055   /// Get the time elapsed between start and stop times.
00056   rutz::time elapsed(const rutz::time& stop) const
00057   {
00058     return stop - m_start_time;
00059   }
00060 
00061   /// Get the time elapsed between start and now.
00062   rutz::time elapsed() const
00063     {
00064       return elapsed(rutz::time::wall_clock_now());
00065     }
00066 
00067 private:
00068   rutz::time m_start_time;
00069 };
00070 
00071 static const char __attribute__((used)) vcid_groovx_rutz_stopwatch_h_utc20050626084019[] = "$Id: stopwatch.h 8249 2007-04-12 06:03:40Z rjpeters $ $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/rutz/stopwatch.h $";
00072 #endif // !GROOVX_RUTZ_STOPWATCH_H_UTC20050626084019_DEFINED
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