Same as the preceding overload, using the specified bucket count and hash/equality functors.
Declared in <bslstl_unorderedset.h>
explicit
unordered_set(
size_type initialNumBuckets,
AttributeHash const& hashFunction = HASH(),
equal_to<Attribute> const& keyEqual = EQUAL(),
allocator<Attribute> const& basicAllocator = ALLOCATOR());