[#bsl-unordered_set-09-2constructor-085]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-09.adoc[unordered_set<Attribute, AttributeHash>]::unordered_set
:relfileprefix: ../../
:mrdocs:

Create an unordered set having the same value as the specified `original` object that uses the specified `basicAllocator` to supply memory. Use a copy of `original.hash_function()` to generate hash values for the keys contained in this set. Use a copy of `original.key_eq()` to verify that two keys are equivalent. This method requires that the (template parameter) type `KEY` be `copy‐insertable` into this set (see {Requirements on `KEY`}). Note that a `bslma::Allocator *` can be supplied for `basicAllocator` if the (template parameter) type `ALLOCATOR` is `bsl::allocator` (the default).

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
unordered_set(
    xref:bsl/unordered_set-0d2d.adoc[unordered_set<Attribute, AttributeHash>] const& original,
    type_identity<allocator<Attribute>>::type const& basicAllocator);
----


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