Deduce the template parameter KEY from the value_type of the initializer_list supplied to the constructor of unordered_multiset. This deduction guide does not participate unless the supplied allocator meets the requirements of a standard allocator.
Declared in <bslstl_unorderedmultiset.h>
template<
class KEY,
class ALLOCATOR>
requires bsl::IsStdAllocator_v<ALLOCATOR>
unordered_multiset<KEY, bsl::hash<KEY>, bsl::equal_to<KEY>, ALLOCATOR>(
std::initializer_list<KEY>,
bsl::allocator_traits<ALLOCATOR>::size_type,
ALLOCATOR) -> unordered_multiset<KEY, bsl::hash<KEY>, bsl::equal_to<KEY>, ALLOCATOR>;