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a5544970 | 1 | // Copyright (C) 2017-2019 Free Software Foundation, Inc. |
d2e9196e JW |
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 | // { dg-do run { target c++11 } } | |
19 | ||
20 | #include <locale> | |
21 | #include <streambuf> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | struct streambuf : std::streambuf | |
25 | { | |
26 | int_type underflow() override | |
27 | { | |
28 | if (c != '\0') | |
29 | { | |
30 | this->setg(&c, &c, &c + 1); | |
31 | return *this->gptr(); | |
32 | } | |
33 | c = '\0'; | |
34 | return traits_type::eof(); | |
35 | } | |
36 | ||
37 | private: | |
38 | char c = 'a'; | |
39 | }; | |
40 | ||
41 | struct codecvt : std::codecvt<wchar_t, char, std::mbstate_t> { }; | |
42 | ||
43 | void | |
44 | test01() | |
45 | { | |
46 | // https://gcc.gnu.org/ml/libstdc++/2017-11/msg00022.html | |
47 | streambuf sb; | |
48 | std::wbuffer_convert<codecvt> conv(&sb); | |
49 | VERIFY( sb.in_avail() == 0 ); | |
50 | wchar_t c = conv.sgetc(); | |
51 | VERIFY( c == L'a' ); | |
52 | } | |
53 | ||
54 | int | |
55 | main() | |
56 | { | |
57 | test01(); | |
58 | } |