| // Copyright (C) 2017-2023 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 } } |
| |
| #include <charconv> |
| #include <string> |
| |
| template<typename I> |
| bool |
| check_from_chars(I expected, std::string s, int base = 0, char term = '\0') |
| { |
| const char* begin = s.data(); |
| const char* end = s.data() + s.length(); |
| I val; |
| std::from_chars_result r = base == 0 |
| ? std::from_chars(begin, end, val) |
| : std::from_chars(begin, end, val, base); |
| return r.ec == std::errc{} && (r.ptr == end || *r.ptr == term) |
| && val == expected; |
| } |
| |
| #include <climits> |
| #include <testsuite_hooks.h> |
| |
| void |
| test01() |
| { |
| // Using base 10 |
| VERIFY( check_from_chars(123, "123") ); |
| VERIFY( check_from_chars(-123, "-123") ); |
| VERIFY( check_from_chars(123, "123a", 10, 'a') ); |
| VERIFY( check_from_chars(123, "0000000000000000000000000000123") ); |
| VERIFY( check_from_chars(123, "0000000000000000000000000000123a", 10, 'a') ); |
| } |
| |
| void |
| test02() |
| { |
| // "0x" parsed as "0" not as hex prefix: |
| for (int base = 2; base < 34; ++base) |
| { |
| VERIFY( check_from_chars(0, "0x1", base, 'x') ); |
| VERIFY( check_from_chars(0, "0X1", base, 'X') ); |
| } |
| |
| VERIFY( check_from_chars(1123, "0x1", 34) ); |
| VERIFY( check_from_chars(1123, "0X1", 34) ); |
| VERIFY( check_from_chars(1156, "0x1", 35) ); |
| VERIFY( check_from_chars(1156, "0X1", 35) ); |
| VERIFY( check_from_chars(1189, "0x1", 36) ); |
| VERIFY( check_from_chars(1189, "0X1", 36) ); |
| |
| VERIFY( check_from_chars(1155, "xx", 34) ); |
| VERIFY( check_from_chars(1155, "XX", 34) ); |
| VERIFY( check_from_chars(1155, "Xx", 34) ); |
| VERIFY( check_from_chars(1224, "yy", 35) ); |
| VERIFY( check_from_chars(1224, "YY", 35) ); |
| VERIFY( check_from_chars(1224, "yY", 35) ); |
| VERIFY( check_from_chars(1295, "zz", 36) ); |
| VERIFY( check_from_chars(1295, "ZZ", 36) ); |
| VERIFY( check_from_chars(1295, "Zz", 36) ); |
| |
| // Parsing stops at first invalid digit for the given base: |
| VERIFY( check_from_chars(1, "01234", 2, '2') ); |
| VERIFY( check_from_chars(27, "1234", 4, '4') ); |
| VERIFY( check_from_chars(1155, "xxy", 34, 'y') ); |
| VERIFY( check_from_chars(1224, "yyz", 35, 'z') ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| } |