Tiny Vector Matrix library using Expression Templates

00001 /*
00002  * Tiny Vector Matrix Library
00003  * Dense Vector Matrix Libary of Tiny size using Expression Templates
00004  *
00005  * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net>
00006  *
00007  * This library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with this library; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00020  *
00021  * $Id: Timer.h,v 1.9 2007-06-23 15:58:59 opetzold Exp $
00022  */
00023 
00024 #ifndef TVMET_UTIL_TIMER_H
00025 #define TVMET_UTIL_TIMER_H
00026 
00027 #if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H)
00028 #  include <sys/time.h>
00029 #  include <sys/resource.h>
00030 #  include <unistd.h>
00031 #else
00032 #  include <ctime>
00033 #endif
00034 
00035 namespace tvmet {
00036 
00037 namespace util {
00038 
00052 class Timer
00053 {
00054   Timer(const Timer&);
00055   Timer& operator=(const Timer&);
00056 
00057 public: // types
00058   typedef double          time_t;
00059 
00060 public:
00062   Timer() { m_start_time = getTime(); }
00063 
00065   void restart() { m_start_time = getTime(); }
00066 
00068   time_t elapsed() const { return (getTime() - m_start_time); }
00069 
00070 private:
00071   time_t getTime() const {
00072 #if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H)
00073     getrusage(RUSAGE_SELF, &m_rusage);
00074     time_t sec = m_rusage.ru_utime.tv_sec; // user, no system time
00075     time_t usec  = m_rusage.ru_utime.tv_usec; // user, no system time
00076     return sec + usec/1e6;
00077 #else
00078     return static_cast<time_t>(std::clock()) / static_cast<time_t>(CLOCKS_PER_SEC);
00079 #endif
00080   }
00081 
00082 private:
00083 #if defined(TVMET_HAVE_SYS_TIME_H) && defined(TVMET_HAVE_UNISTD_H)
00084   mutable struct rusage         m_rusage;
00085 #endif
00086   time_t            m_start_time;
00087 };
00088 
00089 } // namespace util
00090 
00091 } // namespace tvmet
00092 
00093 #endif // TVMET_UTIL_TIMER_H
00094 
00095 // Local Variables:
00096 // mode:C++
00097 // tab-width:8
00098 // End:
include/tvmet/util/Timer.h
