libstdc++-v3/testsuite/performance/string_append.cc

   1  // Copyright (C) 2003 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 2, 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 COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // As a special exception, you may use this file as part of a free software
  20 // library without restriction.  Specifically, if other files instantiate
  21 // templates or use macros or inline functions from this file, or you compile
  22 // this file and link it with other files to produce an executable, this
  23 // file does not by itself cause the resulting executable to be covered by
  24 // the GNU General Public License.  This exception does not however
  25 // invalidate any other reasons why the executable file might be covered by
  26 // the GNU General Public License.
  27
  28 #include <ctime>
  29 #include <iostream>
  30 #include <string>
  31 #include <testsuite_performance.h>
  32
  33 using namespace std;
  34
  35 void
  36 test_append_char(int how_much)
  37 {
  38   string buf; // no preallocation
  39   for (int i = 0; i < how_much; ++i)
  40     buf.append(static_cast<string::size_type>(1) , 'x');
  41 }
  42
  43 void
  44 test_append_string(int how_much)
  45 {
  46   string s(static_cast<string::size_type>(1) , 'x');
  47   string buf; // no preallocation
  48   for (int i = 0; i < how_much; ++i)
  49     buf.append(s);
  50 }
  51
  52 void
  53 run_benchmark1(int how_much)
  54 {
  55   using namespace __gnu_test;
  56   time_counter time;
  57   resource_counter resource;
  58   start_counters(time, resource);
  59   test_append_char(how_much);
  60   stop_counters(time, resource);
  61   report_performance(__FILE__, "char", time, resource);
  62 }
  63
  64 void
  65 run_benchmark2(int how_much)
  66 {
  67   using namespace __gnu_test;
  68   time_counter time;
  69   resource_counter resource;
  70   start_counters(time, resource);
  71   test_append_string(how_much);
  72   stop_counters(time, resource);
  73   report_performance(__FILE__, "string", time, resource);
  74 }
  75
  76 // libstdc++/5380
  77 // libstdc++/4960
  78 int main()
  79 {
  80   run_benchmark1(10000);
  81   run_benchmark2(10000);
  82   run_benchmark1(100000);
  83   run_benchmark2(100000);
  84   run_benchmark1(1000000);
  85   run_benchmark2(1000000);
  86 }