libstdc++-v3/testsuite/performance/22_locale/wchar_t_out.cc

   1 // Copyright (C) 2003-2019 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 <cstdio>
  20 #include <cstring>
  21 #include <fstream>
  22 #include <langinfo.h>
  23 #include <iconv.h>
  24 #include <testsuite_performance.h>
  25
  26 // libstdc++/11602
  27 int main(int argc, char** argv)
  28 {
  29   using namespace std;
  30   using namespace __gnu_test;
  31
  32   time_counter time;
  33   resource_counter resource;
  34   const int iters = 300000;
  35
  36   wchar_t wbuf[1024];
  37   char cbuf[1024];
  38
  39   wmemset(wbuf, L'a', 1024);
  40
  41   // C (iconv)
  42   iconv_t cd = iconv_open(nl_langinfo(CODESET), "WCHAR_T");
  43   start_counters(time, resource);
  44   for (int i = 0; i < iters; ++i)
  45     {
  46       size_t inbytesleft = 1024 * sizeof(wchar_t);
  47       size_t outbytesleft = 1024;
  48       char* in = reinterpret_cast<char*>(wbuf);
  49       char* out = cbuf;
  50       iconv(cd, &in, &inbytesleft, &out, &outbytesleft);
  51     }
  52   stop_counters(time, resource);
  53   iconv_close(cd);
  54   report_performance(__FILE__, "C (iconv)", time, resource);
  55   clear_counters(time, resource);
  56
  57   // C++ (codecvt)
  58   locale loc;
  59   const codecvt<wchar_t, char, mbstate_t>& cvt =
  60     use_facet<codecvt<wchar_t, char, mbstate_t> >(loc);
  61   mbstate_t state;
  62   memset(&state, 0, sizeof(state));
  63   start_counters(time, resource);
  64   for (int i = 0; i < iters; ++i)
  65     {
  66       const wchar_t* from_next;
  67       char* to_next;
  68       cvt.out(state, wbuf, wbuf + 1024, from_next,
  69               cbuf, cbuf + 1024, to_next);
  70     }
  71   stop_counters(time, resource);
  72   report_performance(__FILE__, "C++ (codecvt)", time, resource);
  73
  74   return 0;
  75 }