[#BloombergLP-bdlc-FlatHashSet-2constructor-077]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashSet.adoc[FlatHashSet]::FlatHashSet
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:mrdocs:

Create an empty `FlatHashSet` object. Optionally specify a `capacity` indicating the minimum initial size of the underlying array of entries of this container. If `capacity` is not supplied or is 0, no memory is allocated. Optionally specify a `hash` functor used to generate the hash values associated with the elements in this container. If `hash` is not supplied, a default‐constructed object of the (template parameter) type `HASH` is used. Optionally specify an equality functor `equal` used to determine whether two elements are equivalent. If `equal` is not supplied, a default‐constructed object of the (template parameter) type `EQUAL` is used. Optionally specify a `basicAllocator` used to supply memory. If `basicAllocator` is not supplied or is 0, the currently installed default allocator is used.

== Synopsis

Declared in `<bdlc_flathashset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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FlatHashSet();
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