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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2020 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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20
  21 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  22
  23 // Permission to use, copy, modify, sell, and distribute this software
  24 // is hereby granted without fee, provided that the above copyright
  25 // notice appears in all copies, and that both that copyright notice
  26 // and this permission notice appear in supporting documentation. None
  27 // of the above authors, nor IBM Haifa Research Laboratories, make any
  28 // representation about the suitability of this software for any
  29 // purpose. It is provided "as is" without express or implied
  30 // warranty.
  31
  32 /**
  33  * @file elapsed_timer.cpp
  34  * Contains utilities for tests.
  35  */
  36
  37 #include <util/performance/time/elapsed_timer.hpp>
  38
  39 namespace __gnu_pbds
  40 {
  41
  42   namespace test
  43   {
  44
  45     elapsed_timer::
  46     elapsed_timer()
  47     {
  48       reset();
  49     }
  50
  51     void
  52     elapsed_timer::
  53     reset()
  54     {
  55       m_start = ::clock();
  56     }
  57
  58     elapsed_timer::
  59     operator double() const
  60     {
  61       const clock_t now = ::clock();
  62
  63       return (((double)now - m_start) / CLOCKS_PER_SEC);
  64     }
  65
  66   } // namespace test
  67
  68 } // namespace __gnu_pbds