17d62b00eSchristos /* A hasher for enums. 27d62b00eSchristos 3*6881a400Schristos Copyright (C) 2017-2023 Free Software Foundation, Inc. 47d62b00eSchristos 57d62b00eSchristos This file is part of GDB. 67d62b00eSchristos 77d62b00eSchristos This program is free software; you can redistribute it and/or modify 87d62b00eSchristos it under the terms of the GNU General Public License as published by 97d62b00eSchristos the Free Software Foundation; either version 3 of the License, or 107d62b00eSchristos (at your option) any later version. 117d62b00eSchristos 127d62b00eSchristos This program is distributed in the hope that it will be useful, 137d62b00eSchristos but WITHOUT ANY WARRANTY; without even the implied warranty of 147d62b00eSchristos MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 157d62b00eSchristos GNU General Public License for more details. 167d62b00eSchristos 177d62b00eSchristos You should have received a copy of the GNU General Public License 187d62b00eSchristos along with this program. If not, see <http://www.gnu.org/licenses/>. */ 197d62b00eSchristos 207d62b00eSchristos #ifndef COMMON_HASH_ENUM_H 217d62b00eSchristos #define COMMON_HASH_ENUM_H 227d62b00eSchristos 237d62b00eSchristos /* A hasher for enums, which was missing in C++11: 247d62b00eSchristos http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2148 257d62b00eSchristos */ 267d62b00eSchristos 277d62b00eSchristos namespace gdb { 287d62b00eSchristos 297d62b00eSchristos /* Helper struct for hashing enum types. */ 307d62b00eSchristos template<typename T> 317d62b00eSchristos struct hash_enum 327d62b00eSchristos { 337d62b00eSchristos typedef size_t result_type; 347d62b00eSchristos typedef T argument_type; 357d62b00eSchristos 367d62b00eSchristos size_t operator() (T val) const noexcept 377d62b00eSchristos { 387d62b00eSchristos using underlying = typename std::underlying_type<T>::type; 397d62b00eSchristos return std::hash<underlying> () (static_cast<underlying> (val)); 407d62b00eSchristos } 417d62b00eSchristos }; 427d62b00eSchristos 437d62b00eSchristos } /* namespace gdb */ 447d62b00eSchristos 457d62b00eSchristos #endif /* COMMON_HASH_ENUM_H */ 46