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-rw-r--r--gdb/common/hash_enum.h45
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diff --git a/gdb/common/hash_enum.h b/gdb/common/hash_enum.h
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-/* A hasher for enums.
-
- Copyright (C) 2017-2019 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 */