https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104174
Bug ID: 104174
Summary: [12 Regression] unordered_map<const T, U, E, H> fails
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
#include <unordered_map>
struct H : std::hash<int> { };
std::unordered_map<const int, int, std::equal_to<int>, H> m;
In file included from /home/jwakely/gcc/12/include/c++/12.0.1/unordered_map:47,
from um.C:1:
/home/jwakely/gcc/12/include/c++/12.0.1/bits/unordered_map.h: In instantiation
of 'class std::unordered_map<const int, int, std::equal_to<int>, H>':
um.C:5:59: required from here
/home/jwakely/gcc/12/include/c++/12.0.1/bits/unordered_map.h:113:49: error: no
type named 'mapped_type' in 'class std::_Hashtable<const int, std::pair<const
int, int>, std::allocator<std::pair<const int, int> >,
std::__detail::_Select1st, H, std::equal_to<int>,
std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true,
false, true> >'
113 | typedef typename _Hashtable::mapped_type mapped_type;
| ^~~~~~~~~~~
This was caused by my g:d87105d697ced10e1f7af3f1f80ef6c9890c8585
