libstdc++-v3/testsuite/performance/21_strings/cons_input_iterator.cc

   1 // Copyright (C) 2004-2022 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
  19 #include <iterator>
  20 #include <sstream>
  21
  22 #include <testsuite_performance.h>
  23
  24 void benchmark(long len)
  25 {
  26   using namespace std;
  27   using namespace __gnu_test;
  28
  29   time_counter time;
  30   resource_counter resource;
  31
  32   istringstream isstr(string(len, 'a'));
  33
  34   start_counters(time, resource);
  35   string str((istreambuf_iterator<char>(isstr)),
  36              istreambuf_iterator<char>());
  37   stop_counters(time, resource);
  38
  39   report_performance(__FILE__, "", time, resource);
  40   clear_counters(time, resource);
  41 }
  42
  43 int main()
  44 {
  45   benchmark(500000);
  46   benchmark(5000000);
  47   benchmark(50000000);
  48   return 0;
  49 }