[#bsl-unordered_set-09-insert-0e]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-09.adoc[unordered_set<Attribute, AttributeHash>]::insert
:relfileprefix: ../../
:mrdocs:

Insert the specified `value` into this set if a key equivalent to `value` does not already exist in this set; otherwise, if a key equivalent to `value` already exists in this set, this method has no effect. `value` is left in a valid but unspecified state. Return an iterator referring to the (possibly newly inserted) `value_type` object in this set that is equivalent to `value`. 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 `move‐insertable` (see {Requirements on `KEY`}) into this set. 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"]
----
xref:bsl/unordered_set-09/iterator.adoc[iterator]
insert(
    xref:bsl/unordered_set-09/const_iterator.adoc[const_iterator] hint,
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<value_type>] value);
----


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