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

   1 // Copyright (C) 2004-2016 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 <sstream>
  20 #include <testsuite_performance.h>
  21
  22 // libstdc++/16401 ostringstream in gcc 3.4.x very slow for big data
  23 void test01()
  24 {
  25   using namespace std;
  26   using namespace __gnu_test;
  27
  28   time_counter time;
  29   resource_counter resource;
  30
  31   for(unsigned n = 10000; n <= 10000000; n *= 10)
  32     {
  33       ostringstream oss;
  34       oss << "size = " << n;
  35
  36       ostringstream str;
  37       start_counters(time, resource);
  38       for(unsigned i = 0; i < n; ++i)
  39         str << 'a';
  40       stop_counters(time, resource);
  41
  42       report_performance(__FILE__, oss.str(), time, resource);
  43       clear_counters(time, resource);
  44     }
  45 }
  46
  47 int main()
  48 {
  49   test01();
  50   return 0;
  51 }