/* A hasher for enums. Copyright (C) 2017 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 . */ #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 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::type; return std::hash () (static_cast (val)); } }; } /* namespace gdb */ #endif /* COMMON_HASH_ENUM_H */