libstdc++-v3/testsuite/performance/27_io/fstream_seek_write.cc

   1 // Copyright (C) 2003-2018 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 #include <unistd.h>
  19 #include <fstream>
  20 #include <testsuite_performance.h>
  21
  22 // libstdc++/10672
  23 int main()
  24 {
  25   using namespace std;
  26   using namespace __gnu_test;
  27
  28   time_counter time;
  29   resource_counter resource;
  30   const int iterations = 300000;
  31
  32   fstream s("tmp_perf_seek", ios::binary | ios::in | ios::out | ios::trunc);
  33   if (s.good())
  34     {
  35       start_counters(time, resource);
  36       for (int i = 0; i < iterations; i++)
  37         {
  38           s.seekp(0);
  39           s.write((char *) & i, sizeof(int));
  40           s.seekp(sizeof(int));
  41           s.write((char *) & i, sizeof(int));
  42         }
  43       stop_counters(time, resource);
  44       report_performance(__FILE__, "", time, resource);
  45     }
  46
  47   unlink("tmp_perf_seek");
  48   return 0;
  49 }