libstdc++-v3/testsuite/performance/25_algorithms/copy_streambuf_iterators.cc

   1 // Copyright (C) 2006-2020 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 #include <algorithm>
  22 #include <testsuite_performance.h>
  23
  24 // libstdc++/25482
  25 int main()
  26 {
  27   using namespace std;
  28   using namespace __gnu_test;
  29
  30   typedef istreambuf_iterator<char> in_iterator_type;
  31   typedef ostreambuf_iterator<char> out_iterator_type;
  32
  33   time_counter time;
  34   resource_counter resource;
  35
  36   const char data[] = "Contrappunto dialettico alla mente";
  37
  38   // istreambuf iterators -> ostreambuf iterator
  39   {
  40     istringstream iss(data);
  41     in_iterator_type beg(iss);
  42     in_iterator_type end;
  43
  44     ostringstream oss;
  45     out_iterator_type out(oss);
  46
  47     start_counters(time, resource);
  48     for (unsigned i = 0; i < 10000000; ++i)
  49       {
  50         copy(beg, end, out);
  51         iss.seekg(0);
  52         oss.seekp(0);
  53       }
  54     stop_counters(time, resource);
  55     report_performance(__FILE__, "isb iters -> osb iter", time, resource);
  56     clear_counters(time, resource);
  57   }
  58
  59   // char array -> ostreambuf iterator
  60   {
  61     const char* beg = data;
  62     const char* end = data + sizeof(data) - 1;
  63
  64     ostringstream oss;
  65     out_iterator_type out(oss);
  66
  67     start_counters(time, resource);
  68     for (unsigned i = 0; i < 10000000; ++i)
  69       {
  70         copy(beg, end, out);
  71         oss.seekp(0);
  72       }
  73     stop_counters(time, resource);
  74     report_performance(__FILE__, "pointers  -> osb iter", time, resource);
  75     clear_counters(time, resource);
  76   }
  77
  78   // istreambuf iterators -> char array
  79   {
  80     istringstream iss(data);
  81     in_iterator_type beg(iss);
  82     in_iterator_type end;
  83
  84     char out[sizeof(data)];
  85
  86     start_counters(time, resource);
  87     for (unsigned i = 0; i < 10000000; ++i)
  88       {
  89         copy(beg, end, out);
  90         iss.seekg(0);
  91       }
  92     stop_counters(time, resource);
  93     report_performance(__FILE__, "isb iters -> pointer", time, resource);
  94     clear_counters(time, resource);
  95   }
  96
  97   return 0;
  98 }