Create an unordered_multiset from the specified range, using the optionally specified initialNumBuckets, hashFunction, keyEqual, and basicAllocator.
Declared in <bslstl_unorderedmultiset.h>
template<class RANGE>
unordered_multiset(
std::from_range_t,
RANGE&& range,
size_type initialNumBuckets,
HASH const& hashFunction,
ALLOCATOR const& basicAllocator);