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52066eae | 1 | // { dg-do compile { target c++11 } } |
73d81d3a | 2 | |
8d9254fc | 3 | // Copyright (C) 2015-2020 Free Software Foundation, Inc. |
73d81d3a JW |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | // | |
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | // | |
16 | // You should have received a copy of the GNU General Public License along | |
17 | // with this library; see the file COPYING3. If not see | |
18 | // <http://www.gnu.org/licenses/>. | |
19 | ||
20 | #include <type_traits> | |
21 | ||
22 | template<typename T, typename I0, typename... I> | |
23 | struct smallest_rank | |
24 | : std::conditional< sizeof(T) == sizeof(I0), | |
25 | I0, | |
26 | typename smallest_rank<T, I...>::type > | |
27 | { }; | |
28 | ||
29 | template<typename T, typename I0> | |
30 | struct smallest_rank<T, I0> | |
31 | { using type = I0; }; | |
32 | ||
33 | template<typename T> | |
34 | using smallest_rank_t | |
35 | = typename smallest_rank<typename std::remove_cv<T>::type, | |
36 | unsigned char, unsigned short, unsigned int, | |
37 | unsigned long, unsigned long long>::type; | |
38 | ||
39 | using std::make_unsigned; | |
40 | using std::is_same; | |
41 | ||
42 | enum E1 : char { }; | |
43 | using I1 = smallest_rank_t<E1>; | |
44 | static_assert(is_same<make_unsigned<E1>::type, I1>::value, ""); | |
45 | static_assert(is_same<make_unsigned<E1 const>::type, I1 const>::value, ""); | |
46 | ||
47 | enum E2 : short { }; | |
48 | using I2 = smallest_rank_t<E2>; | |
49 | static_assert(is_same<make_unsigned<E2>::type, I2>::value, ""); | |
50 | static_assert(is_same<make_unsigned<E2 const>::type, I2 const>::value, ""); | |
51 | ||
52 | enum E3 : int { }; | |
53 | using I3 = smallest_rank_t<E3>; | |
54 | static_assert(is_same<make_unsigned<E3>::type, I3>::value, ""); | |
55 | static_assert(is_same<make_unsigned<E3 const>::type, I3 const>::value, ""); | |
56 | ||
57 | enum E4 : long { }; | |
58 | using I4 = smallest_rank_t<E4>; | |
59 | static_assert(is_same<make_unsigned<E4>::type, I4>::value, ""); | |
60 | static_assert(is_same<make_unsigned<E4 const>::type, I4 const>::value, ""); | |
61 | ||
22f1f4c7 | 62 | // PR libstdc++/60333 |
73d81d3a JW |
63 | enum E5 : long long { }; |
64 | using I5 = smallest_rank_t<E5>; | |
65 | static_assert(is_same<make_unsigned<E5>::type, I5>::value, ""); | |
66 | static_assert(is_same<make_unsigned<E5 const>::type, I5 const>::value, ""); | |
22f1f4c7 JW |
67 | |
68 | // PR libstdc++/85951 | |
69 | using I6 = smallest_rank_t<char16_t>; | |
70 | static_assert(is_same<make_unsigned<char16_t>::type, I6>::value, ""); | |
71 | static_assert(is_same<make_unsigned<char16_t const>::type, I6 const>::value, ""); | |
72 | using I7 = smallest_rank_t<char32_t>; | |
73 | static_assert(is_same<make_unsigned<char32_t>::type, I7>::value, ""); | |
74 | static_assert(is_same<make_unsigned<char32_t const>::type, I7 const>::value, ""); | |
75 | #ifdef _GLIBCXX_USE_WCHAR_T | |
76 | using I8 = smallest_rank_t<wchar_t>; | |
77 | static_assert(is_same<make_unsigned<wchar_t>::type, I8>::value, ""); | |
78 | static_assert(is_same<make_unsigned<wchar_t const>::type, I8 const>::value, ""); | |
79 | #endif |