1 // Copyright (C) 2006-2020 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
test01()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 
main()51 int main()
52 {
53   test01();
54   return 0;
55 }
56