libstdc++-v3/testsuite/27_io/basic_stringbuf/seekpos/wchar_t/3.cc

   1 // 2003-05-30  Paolo Carlini  <pcarlini@unitus.it>
   2
   3 // Copyright (C) 2003-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <sstream>
  21 #include <testsuite_hooks.h>
  22
  23 void test01()
  24 {
  25   using namespace std;
  26   typedef wstringbuf::pos_type pos_type;
  27   typedef wstringbuf::off_type off_type;
  28
  29   wstringbuf strb_01(ios_base::out);
  30
  31   strb_01.sputn(L"broken peak", 11);
  32   pos_type pt_1 = strb_01.pubseekoff(0, ios_base::end, ios_base::out);
  33
  34   // In general, according to 27.7.1.3,14, the below has undefined
  35   // behaviour since pt_1 + off_type(1) doesn't come from a
  36   // previous pubseekpos or pubseekoff. However, given v3 implementation,
  37   // this was useful to expose a bug in pubseekpos checks.
  38   pos_type pt_2 = strb_01.pubseekpos(pt_1 + off_type(1), ios_base::out);
  39   VERIFY( pt_2 == pos_type(off_type(-1)) );
  40 }
  41
  42 int main()
  43 {
  44   test01();
  45   return 0;
  46 }