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46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
/* A hasher for enums.
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_HASH_ENUM_H
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#define COMMON_HASH_ENUM_H
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/* A hasher for enums, which was missing in C++11:
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http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2148
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*/
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namespace gdb {
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/* Helper struct for hashing enum types. */
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template<typename T>
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struct hash_enum
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{
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typedef size_t result_type;
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typedef T argument_type;
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size_t operator() (T val) const noexcept
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{
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using underlying = typename std::underlying_type<T>::type;
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return std::hash<underlying> () (static_cast<underlying> (val));
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}
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};
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} /* namespace gdb */
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#endif /* COMMON_HASH_ENUM_H */
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