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- /* A hasher for enums.
- Copyright (C) 2017-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program 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 of the License, or
- (at your option) any later version.
- This program 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 program. If not, see <http://www.gnu.org/licenses/>. */
- #ifndef COMMON_HASH_ENUM_H
- #define COMMON_HASH_ENUM_H
- /* A hasher for enums, which was missing in C++11:
- http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2148
- */
- namespace gdb {
- /* Helper struct for hashing enum types. */
- template<typename T>
- struct hash_enum
- {
- typedef size_t result_type;
- typedef T argument_type;
- size_t operator() (T val) const noexcept
- {
- using underlying = typename std::underlying_type<T>::type;
- return std::hash<underlying> () (static_cast<underlying> (val));
- }
- };
- } /* namespace gdb */
- #endif /* COMMON_HASH_ENUM_H */
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