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7adcbafe | 1 | // Copyright (C) 2020-2022 Free Software Foundation, Inc. |
2251b4a5 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 | // <charconv> is supported in C++14 as a GNU extension | |
19 | // { dg-do run { target c++14 } } | |
20 | // { dg-add-options ieee } | |
21 | ||
22 | #include <charconv> | |
23 | #include <string> | |
24 | #include <cfenv> | |
25 | #include <testsuite_hooks.h> | |
26 | ||
27 | void | |
28 | test01() | |
29 | { | |
f1a68574 | 30 | #if __cpp_lib_to_chars >= 201611L |
2251b4a5 JW |
31 | #if _GLIBCXX_USE_C99_FENV_TR1 |
32 | double d; | |
5d2233f4 | 33 | #ifdef FE_DOWNWARD |
2251b4a5 | 34 | std::fesetround(FE_DOWNWARD); |
5d2233f4 | 35 | #endif |
2251b4a5 JW |
36 | const std::string s = "0.099999999999999999999999999"; |
37 | auto res = std::from_chars(s.data(), s.data() + s.length(), d); | |
38 | VERIFY( res.ec == std::errc{} ); | |
39 | VERIFY( res.ptr == s.data() + s.length() ); | |
40 | // std::from_chars should ignore the current rounding mode | |
41 | // and always round to nearest. | |
42 | VERIFY( d == 0.1 ); | |
43 | #endif | |
44 | #endif | |
45 | } | |
46 | ||
47 | int | |
48 | main() | |
49 | { | |
50 | test01(); | |
51 | } |