1 // Copyright (C) 2003-2013 Free Software Foundation, Inc.
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)
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.
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/>.
18 // 27.8.1.4 Overridden virtual functions
20 // { dg-require-fileio "" }
24 #include <testsuite_hooks.h>
26 class Cvt : public std::codecvt<char, char, std::mbstate_t>
29 mutable bool unshift_called;
32 : unshift_called(false)
37 do_always_noconv() const throw()
41 do_encoding() const throw()
44 std::codecvt_base::result
45 do_unshift(std::mbstate_t&, char* to, char*, char*& to_next) const
47 unshift_called = true;
49 return std::codecvt_base::ok;
54 // basic_filebuf::seekpos() should call codecvt::unshift()
59 bool test __attribute__((unused)) = true;
60 const char* name = "tmp_seekpos_12790";
63 locale loc(locale::classic(), cvt);
68 fb.open(name, ios_base::out);
69 streampos pos = fb.pubseekoff(0, ios_base::beg);
72 VERIFY( !cvt->unshift_called );
74 VERIFY( cvt->unshift_called );