| // Copyright (C) 2020-2021 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/>. |
| |
| // <charconv> is supported in C++14 as a GNU extension |
| // { dg-do run { target c++14 } } |
| // { dg-add-options ieee } |
| |
| #include <charconv> |
| #include <string> |
| #include <cfenv> |
| #include <testsuite_hooks.h> |
| |
| void |
| test01() |
| { |
| #if __cpp_lib_to_chars >= 201611L |
| #if _GLIBCXX_USE_C99_FENV_TR1 |
| double d; |
| std::fesetround(FE_DOWNWARD); |
| const std::string s = "0.099999999999999999999999999"; |
| auto res = std::from_chars(s.data(), s.data() + s.length(), d); |
| VERIFY( res.ec == std::errc{} ); |
| VERIFY( res.ptr == s.data() + s.length() ); |
| // std::from_chars should ignore the current rounding mode |
| // and always round to nearest. |
| VERIFY( d == 0.1 ); |
| #endif |
| #endif |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| } |