| // Copyright (C) 2017-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-do run { target c++11 } } |
| |
| #include <locale> |
| #include <streambuf> |
| #include <testsuite_hooks.h> |
| |
| struct streambuf : std::streambuf |
| { |
| int_type underflow() override |
| { |
| if (c != '\0') |
| { |
| this->setg(&c, &c, &c + 1); |
| return *this->gptr(); |
| } |
| c = '\0'; |
| return traits_type::eof(); |
| } |
| |
| private: |
| char c = 'a'; |
| }; |
| |
| struct codecvt : std::codecvt<wchar_t, char, std::mbstate_t> { }; |
| |
| void |
| test01() |
| { |
| // https://gcc.gnu.org/ml/libstdc++/2017-11/msg00022.html |
| streambuf sb; |
| std::wbuffer_convert<codecvt> conv(&sb); |
| VERIFY( sb.in_avail() == 0 ); |
| wchar_t c = conv.sgetc(); |
| VERIFY( c == L'a' ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| } |