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a945c346 | 1 | // Copyright (C) 2016-2024 Free Software Foundation, Inc. |
37b204de 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 | // { dg-do compile { target c++11 } } | |
19 | ||
20 | // NB: Don't include any other headers in this file. | |
21 | // LWG 2192 requires <cmath> to declare overloads for integral types. | |
22 | #include <cmath> | |
23 | ||
24 | template<typename, typename> struct is_same { enum { value = 0 }; }; | |
25 | template<typename T> struct is_same<T, T> { enum { value = 1 }; }; | |
26 | ||
27 | template<typename T, typename U = T> | |
28 | constexpr bool check(T val) { | |
29 | return is_same<decltype(std::abs(val)), U>::value; | |
30 | } | |
31 | ||
32 | // Unsigned arguments that promote to int are valid: | |
33 | static_assert( check<short, int>(1), "abs((short)1) returns int" ); | |
34 | static_assert( check<unsigned short, int>(1), | |
35 | "abs((unsigned short)1) returns int" ); | |
36 | ||
37 | static_assert( check(1), "abs(1) returns int" ); | |
38 | static_assert( check(1l), "abs(1l) returns long" ); | |
39 | static_assert( check(1ll), "abs(1ll) returns long long" ); |