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hash_enum.h
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1 /* A hasher for enums.
2
3 Copyright (C) 2017-2018 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #ifndef COMMON_HASH_ENUM_H
21 #define COMMON_HASH_ENUM_H
22
23 /* A hasher for enums, which was missing in C++11:
24 http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2148
25 */
26
27 namespace gdb {
28
29 /* Helper struct for hashing enum types. */
30 template<typename T>
31 struct hash_enum
32 {
33 typedef size_t result_type;
34 typedef T argument_type;
35
36 size_t operator() (T val) const noexcept
37 {
38 using underlying = typename std::underlying_type<T>::type;
39 return std::hash<underlying> () (static_cast<underlying> (val));
40 }
41 };
42
43 } /* namespace gdb */
44
45 #endif /* COMMON_HASH_ENUM_H */
gdb::hash_enum
Definition: hash_enum.h:31
gdb::hash_enum::operator()
size_t operator()(T val) const noexcept
Definition: hash_enum.h:36
gdb::hash_enum::argument_type
T argument_type
Definition: hash_enum.h:34
gdb
Definition: array-view.h:66
gdb::hash_enum::result_type
size_t result_type
Definition: hash_enum.h:33