1 // Copyright (C) 2003 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 2, 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 COPYING. If not, write to the Free
16 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19 // 27.8.1.4 Overridden virtual functions
21 // { dg-require-fileio "" }
25 #include <testsuite_hooks.h>
27 class Cvt : public std::codecvt<char, char, std::mbstate_t>
30 mutable bool unshift_called;
33 : unshift_called(false)
38 do_always_noconv() const throw()
42 do_encoding() const throw()
45 std::codecvt_base::result
46 do_unshift(std::mbstate_t&, char* to, char*, char*& to_next) const
48 unshift_called = true;
50 return std::codecvt_base::ok;
55 // basic_filebuf::seekpos() should call codecvt::unshift()
60 bool test __attribute__((unused)) = true;
61 const char* name = "tmp_seekpos_12790";
64 locale loc(locale::classic(), cvt);
69 fb.open(name, ios_base::out);
70 streampos pos = fb.pubseekoff(0, ios_base::beg);
73 VERIFY( !cvt->unshift_called );
75 VERIFY( cvt->unshift_called );