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| -rw-r--r-- | gdb/ChangeLog | 4 | ||||
| -rw-r--r-- | gdb/common/hash_enum.h | 45 |
2 files changed, 49 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 5d596f0..09cafd0 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,7 @@ +2017-12-08 Pedro Alves <palves@redhat.com> + + * common/hash_enum.h: New file. + 2017-12-08 Jan Kratochvil <jan.kratochvil@redhat.com> * dwarf2read.c (create_cu_from_index_list): New from ... diff --git a/gdb/common/hash_enum.h b/gdb/common/hash_enum.h new file mode 100644 index 0000000..0ea3221 --- /dev/null +++ b/gdb/common/hash_enum.h @@ -0,0 +1,45 @@ +/* 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 <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 */ |