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libstdc++: Restore support for unordered_map<const T, ...> [PR104174]

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I broke this unintentionally in r12-4259.

libstdc++-v3/ChangeLog:

	PR libstdc++/104174
	* include/bits/hashtable_policy.h (_Map_base): Add partial
	specialization for maps with const key types.
	* testsuite/23_containers/unordered_map/104174.cc: New test.
This commit is contained in:
Jonathan Wakely 2022-01-22 00:35:45 +00:00
parent 2d8a9ad4a9
commit 084680db9a
2 changed files with 15 additions and 0 deletions
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11
libstdc++-v3/include/bits/hashtable_policy.h
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@ -812,6 +812,17 @@ namespace __detail
return __pos->second;
}
// Partial specialization for unordered_map<const T, U>, see PR 104174.
template<typename _Key, typename _Val, typename _Alloc, typename _Equal,
typename _Hash, typename _RangeHash, typename _Unused,
typename _RehashPolicy, typename _Traits, bool __uniq>
struct _Map_base<const _Key, pair<const _Key, _Val>,
_Alloc, _Select1st, _Equal, _Hash,
_RangeHash, _Unused, _RehashPolicy, _Traits, __uniq>
: _Map_base<_Key, pair<const _Key, _Val>, _Alloc, _Select1st, _Equal, _Hash,
_RangeHash, _Unused, _RehashPolicy, _Traits, __uniq>
{ };
/**
* Primary class template _Insert_base.
*

4
libstdc++-v3/testsuite/23_containers/unordered_map/104174.cc Normal file
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@ -0,0 +1,4 @@
// { dg-do compile { target c++11 } }
// PR libstdc++/104174 unordered_map<const T, U, H> fails
#include <unordered_map>
std::unordered_map<const int, int, std::hash<int>> m;