Implements P2353R5 "Extending associative containers with the
remaining heterogeneous overloads". Adds overloads templated on
heterogeneous key types for several members of associative
containers, particularly insertions:
/-- unordered --\
set map mset mmap set map mset mmap
@ . . . @ . . . insert
. @ . . . @ . . op[], at, try_emplace,
insert_or_assign
. . . . @ @ @ @ bucket
(Nothing is added to the multiset or multimap tree containers.)
All the insert*() and try_emplace() members also get a hinted
overload. The at() members get const and non-const overloads.
The new overloads enforce concept __heterogeneous_tree_key or
__heterogeneous_hash_key, as in P2077, to enforce that the
function objects provided meet requirements, and that the key
supplied is not an iterator or the native key. Insertions
implicitly construct the required key_type object from the
argument, by move where permitted.
libstdc++-v3/ChangeLog:
PR libstdc++/117402
* include/bits/stl_map.h (operator[], at (2x), try_emplace (2x),
insert_or_assign (2x)): Add overloads.
* include/bits/unordered_map.h (operator[], at (2x),
try_emplace (2x), insert_or_assign (2x), bucket (2x)): Add overloads.
* include/bits/stl_set.h (insert (2x)): Add overloads.
* include/bits/unordered_set.h (insert (2x), bucket (2x)): Add overloads.
* include/bits/hashtable.h (_M_bucket_tr, _M_insert_tr): Define.
* include/bits/hashtable_policy.h (_M_at_tr (2x)): Define.
* include/bits/stl_tree.h (_M_emplace_here, _M_get_insert_unique_pos_tr,
_M_get_insert_hint_unique_pos_tr): Define new heterogeneous insertion
code path for set and map.
* include/bits/version.def (associative_heterogeneous_insertion):
Define.
* include/bits/version.h: Regenerate.
* include/std/map (__glibcxx_want_associative_heterogeneous_insertion):
Define macro.
* include/std/set: Same.
* include/std/unordered_map: Same.
* include/std/unordered_set: Same.
* testsuite/23_containers/map/modifiers/hetero/insert.cc: New tests.
* testsuite/23_containers/set/modifiers/hetero/insert.cc: Same.
* testsuite/23_containers/unordered_map/modifiers/hetero/insert.cc:
Same.
* testsuite/23_containers/unordered_multimap/modifiers/hetero/insert.cc:
Same.
* testsuite/23_containers/unordered_multiset/modifiers/hetero/insert.cc:
Same.
* testsuite/23_containers/unordered_set/modifiers/hetero/insert.cc:
Same.
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