libstdc++-v3/testsuite/27_io/basic_stringbuf/overflow/wchar_t/26250.cc

   1 // Copyright (C) 2006-2021 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 // 27.8.1.4 Overridden virtual functions
  19
  20 #include <sstream>
  21 #include <testsuite_hooks.h>
  22
  23 struct pubbuf
  24 : std::wstringbuf
  25 {
  26   using std::wstringbuf::eback;
  27   using std::wstringbuf::egptr;
  28   using std::wstringbuf::pbase;
  29   using std::wstringbuf::pptr;
  30   using std::wstringbuf::epptr;
  31   using std::wstringbuf::overflow;
  32 };
  33
  34 // libstdc++/26250
  35 void test01()
  36 {
  37   pubbuf buf;
  38
  39   VERIFY( buf.overflow(L'x') == L'x' );
  40   VERIFY( buf.pptr() - buf.pbase() == 1 );
  41
  42   // not required but good for efficiency
  43   // NB: we are implementing DR 169 and DR 432
  44   const int write_positions = buf.epptr() - buf.pbase();
  45   VERIFY( write_positions > 1 );
  46
  47   // 27.7.1.3, p8:
  48   VERIFY( buf.egptr() - buf.eback() == 1 );
  49 }
  50
  51 int main()
  52 {
  53   test01();
  54   return 0;
  55 }