libstdc++-v3/testsuite/performance/21_strings/append-1.cc

   1  // Copyright (C) 2003-2024 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 <ctime>
  20 #include <iostream>
  21 #include <string>
  22 #include <testsuite_performance.h>
  23
  24 using namespace std;
  25
  26 void
  27 test_append_char(int how_much)
  28 {
  29   string buf; // no preallocation
  30   for (int i = 0; i < how_much; ++i)
  31     buf.append(static_cast<string::size_type>(1) , 'x');
  32 }
  33
  34 void
  35 test_append_string(int how_much)
  36 {
  37   string s(static_cast<string::size_type>(1) , 'x');
  38   string buf; // no preallocation
  39   for (int i = 0; i < how_much; ++i)
  40     buf.append(s);
  41 }
  42
  43 void
  44 run_benchmark1(int how_much)
  45 {
  46   using namespace __gnu_test;
  47   time_counter time;
  48   resource_counter resource;
  49   start_counters(time, resource);
  50   test_append_char(how_much);
  51   stop_counters(time, resource);
  52   report_performance(__FILE__, "char", time, resource);
  53 }
  54
  55 void
  56 run_benchmark2(int how_much)
  57 {
  58   using namespace __gnu_test;
  59   time_counter time;
  60   resource_counter resource;
  61   start_counters(time, resource);
  62   test_append_string(how_much);
  63   stop_counters(time, resource);
  64   report_performance(__FILE__, "string", time, resource);
  65 }
  66
  67 // libstdc++/5380
  68 // libstdc++/4960
  69 int main()
  70 {
  71   run_benchmark1(100000);
  72   run_benchmark2(100000);
  73   run_benchmark1(1000000);
  74   run_benchmark2(1000000);
  75   run_benchmark1(10000000);
  76   run_benchmark2(10000000);
  77 }