projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 9c541725 PA |
1 | /* Copyright (C) 2017 Free Software Foundation, Inc. |
| 2 | ||
| 3 | This file is part of GDB. | |
| 4 | ||
| 5 | This program is free software; you can redistribute it and/or modify | |
| 6 | it under the terms of the GNU General Public License as published by | |
| 7 | the Free Software Foundation; either version 3 of the License, or | |
| 8 | (at your option) any later version. | |
| 9 | ||
| 10 | This program is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | GNU General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU General Public License | |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 17 | ||
| 18 | #ifndef COMMON_TRAITS_H | |
| 19 | #define COMMON_TRAITS_H | |
| 20 | ||
| 22796e97 PA |
21 | #include <type_traits> |
| 22 | ||
| 9c541725 PA |
23 | namespace gdb { |
| 24 | ||
| 25 | /* Pre C++14-safe (CWG 1558) version of C++17's std::void_t. See | |
| 26 | <http://en.cppreference.com/w/cpp/types/void_t>. */ | |
| 27 | ||
| 28 | template<typename... Ts> | |
| 29 | struct make_void { typedef void type; }; | |
| 30 | ||
| 31 | template<typename... Ts> | |
| 32 | using void_t = typename make_void<Ts...>::type; | |
| 33 | ||
| 22796e97 | 34 | /* A few trait helpers, mainly stolen from libstdc++. Uppercase |
| b0b92aeb PA |
35 | because "and/or", etc. are reserved keywords. */ |
| 36 | ||
| 37 | template<typename Predicate> | |
| 38 | struct Not : public std::integral_constant<bool, !Predicate::value> | |
| 39 | {}; | |
| 40 | ||
| 41 | template<typename...> | |
| 42 | struct Or; | |
| 43 | ||
| 44 | template<> | |
| 45 | struct Or<> : public std::false_type | |
| 46 | {}; | |
| 47 | ||
| 48 | template<typename B1> | |
| 49 | struct Or<B1> : public B1 | |
| 50 | {}; | |
| 51 | ||
| 52 | template<typename B1, typename B2> | |
| 53 | struct Or<B1, B2> | |
| 54 | : public std::conditional<B1::value, B1, B2>::type | |
| 55 | {}; | |
| 56 | ||
| 57 | template<typename B1,typename B2,typename B3, typename... Bn> | |
| 58 | struct Or<B1, B2, B3, Bn...> | |
| 59 | : public std::conditional<B1::value, B1, Or<B2, B3, Bn...>>::type | |
| 60 | {}; | |
| 22796e97 PA |
61 | |
| 62 | template<typename...> | |
| 63 | struct And; | |
| 64 | ||
| 65 | template<> | |
| 66 | struct And<> : public std::true_type | |
| 67 | {}; | |
| 68 | ||
| 69 | template<typename B1> | |
| 70 | struct And<B1> : public B1 | |
| 71 | {}; | |
| 72 | ||
| 73 | template<typename B1, typename B2> | |
| 74 | struct And<B1, B2> | |
| 75 | : public std::conditional<B1::value, B2, B1>::type | |
| 76 | {}; | |
| 77 | ||
| 78 | template<typename B1, typename B2, typename B3, typename... Bn> | |
| 79 | struct And<B1, B2, B3, Bn...> | |
| 80 | : public std::conditional<B1::value, And<B2, B3, Bn...>, B1>::type | |
| 81 | {}; | |
| 82 | ||
| b0b92aeb PA |
83 | /* Concepts-light-like helper to make SFINAE logic easier to read. */ |
| 84 | template<typename Condition> | |
| 85 | using Requires = typename std::enable_if<Condition::value, void>::type; | |
| 9c541725 PA |
86 | } |
| 87 | ||
| 88 | #endif /* COMMON_TRAITS_H */ |