[#BloombergLP-bdlc-FlatHashMap-count-0d]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashMap.adoc[FlatHashMap]::count
:relfileprefix: ../../../
:mrdocs:

`count` overloads

== Synopses

Declared in `<bdlc_flathashmap.h>`

Return the number of elements in this map having the specified `key`. Note that since a flat hash map maintains unique keys, the returned value will be either 0 or 1.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::size_t
xref:BloombergLP/bdlc/FlatHashMap/count-01.adoc[count](KEY const& key) const;
----

[.small]#xref:BloombergLP/bdlc/FlatHashMap/count-01.adoc[_» more..._]#

Return the number of elements in this map having a key equivalent to the specified `key`. Note that since a flat hash map maintains unique keys, the returned value will be either 0 or 1.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
std::size_t
xref:BloombergLP/bdlc/FlatHashMap/count-04.adoc[count](LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
         && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

[.small]#xref:BloombergLP/bdlc/FlatHashMap/count-04.adoc[_» more..._]#


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