libstdc++-v3/testsuite/util/performance/time/elapsed_timer.cc

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the terms
   7 // of the GNU General Public License as published by the Free Software
   8 // Foundation; either version 2, or (at your option) any later
   9 // version.
  10
  11 // This library is distributed in the hope that it will be useful, but
  12 // WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 // General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  19 // MA 02111-1307, USA.
  20
  21 // As a special exception, you may use this file as part of a free
  22 // software library without restriction.  Specifically, if other files
  23 // instantiate templates or use macros or inline functions from this
  24 // file, or you compile this file and link it with other files to
  25 // produce an executable, this file does not by itself cause the
  26 // resulting executable to be covered by the GNU General Public
  27 // License.  This exception does not however invalidate any other
  28 // reasons why the executable file might be covered by the GNU General
  29 // Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
  35 // notice appears in all copies, and that both that copyright notice
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  37 // of the above authors, nor IBM Haifa Research Laboratories, make any
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  40 // warranty.
  41
  42 /**
  43  * @file elapsed_timer.cpp
  44  * Contains utilities for tests.
  45  */
  46
  47 #include <util/performance/time/elapsed_timer.hpp>
  48
  49 namespace __gnu_pbds
  50 {
  51
  52   namespace test
  53   {
  54
  55     elapsed_timer::
  56     elapsed_timer()
  57     {
  58       reset();
  59     }
  60
  61     void
  62     elapsed_timer::
  63     reset()
  64     {
  65       m_start = ::clock();
  66     }
  67
  68     elapsed_timer::
  69     operator double() const
  70     {
  71       const clock_t now = ::clock();
  72
  73       return (((double)now - m_start) / CLOCKS_PER_SEC);
  74     }
  75
  76   } // namespace test
  77
  78 } // namespace __gnu_pbds