[#BloombergLP-bdlc-FlatHashSet-insert-068]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashSet.adoc[FlatHashSet]::insert
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:mrdocs:

Insert the specified `value` into this set if the `value` does not already exist in this set; otherwise, this method has no effect. Return a `pair` whose `first` member is a `const_iterator` referring to the (possibly newly inserted) element in this set whose value is equivalent to that of the element to be inserted, and whose `second` member is `true` if a new element was inserted, and `false` if an equivalent value was already present.

== Synopsis

Declared in `<bdlc_flathashset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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xref:bsl/pair-0b.adoc[bsl::pair<const_iterator, bool>]
insert(KEY const& value);
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