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/* A hasher for enums.
Copyright (C) 2017-2018 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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