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8d9254fc | 1 | // Copyright (C) 2019-2020 Free Software Foundation, Inc. |
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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-options "-std=gnu++2a" } | |
19 | // { dg-do compile { target c++2a } } | |
20 | ||
21 | #include <utility> | |
22 | ||
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23 | #ifndef __cpp_lib_constexpr_algorithms |
24 | # error "Feature-test macro for constexpr algorithms missing" | |
25 | #elif __cpp_lib_constexpr_algorithms < 201806L | |
26 | # error "Feature-test macro for constexpr algorithms has wrong value" | |
27 | #endif | |
28 | ||
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29 | constexpr bool |
30 | test() | |
31 | { | |
32 | constexpr double e_v = 2.71828182846; | |
33 | double e = e_v; | |
34 | constexpr double pi_v = 3.14159265359; | |
35 | const auto x = std::exchange(e, pi_v); | |
36 | ||
37 | return x == e_v && e == pi_v; | |
38 | } | |
39 | ||
40 | static_assert(test()); |