[#bsl-unordered_set-09-insert-01]
= 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 a pair whose `first` member is an iterator referring to the (possibly newly inserted) `value_type` object in this set that is equivalent to `value`, and whose `second` member is `true` if a new value was inserted, and `false` if the key was already present.

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
xref:bsl/pair-0b.adoc[pair<iterator, bool>]
insert(LOOKUP_KEY&& value)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
        && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

== Description

Note: implemented inline due to Sun CC compilation error.


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