[#bsl-unordered_set-02a-emplace_hint]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-02a.adoc[unordered_set<ManagedAttribute, AttributeHash>]::emplace_hint
:relfileprefix: ../../
:mrdocs:

Insert into this unordered set a newly created `value_type` object, constructed by forwarding `get_allocator()` (if required) and the specified (variable number of) `arguments` to the corresponding constructor of `value_type`, if a key equivalent to such a value does not already exists in this set; otherwise, this method has no effect (other than possibly creating a temporary `value_type` object). Return an iterator referring to the (possibly newly created and inserted) object in this set whose value is equivalent to that of an object constructed from `arguments`. The average and worst case complexity of this operation is not affected by the specified `hint`. This method requires that the (template parameter) type `KEY` be `emplace‐constructible` into this set from `arguments` (see {Requirements on `KEY`}). The behavior is undefined unless `hint` is an iterator in the range `[begin() .. end()]` (both endpoints included). Note that `hint` is ignored (other than possibly asserting its validity in some build modes).

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... Args>
xref:bsl/unordered_set-02a/iterator.adoc[iterator]
emplace_hint(
    xref:bsl/unordered_set-02a/const_iterator.adoc[const_iterator] hint,
    Args&&... arguments);
----


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