[#bsl-map-0a7-count-05]
= xref:bsl.adoc[bsl]::xref:bsl/map-0a7.adoc[map]::count
:relfileprefix: ../../
:mrdocs:

`count` overloads

== Synopses

Declared in `<bslstl_map.h>`

Return the number of `value_type` objects within this map whose keys are equivalent to the specified `key`. Note that since a map maintains unique keys, the returned value will be either 0 or 1.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/map-0a7/size_type.adoc[size_type]
xref:bsl/map-0a7/count-00.adoc[count](xref:bsl/map-0a7/key_type.adoc[key_type] const& key) const;
----

[.small]#xref:bsl/map-0a7/count-00.adoc[_» more..._]#

Return the number of `value_type` objects within this map whose keys are equivalent to the specified `key`. Note that although a map maintains unique keys, the returned value can be other than 0 or 1, because a transparent comparator may have been supplied that provides a different (but compatible) partitioning of keys for `LOOKUP_KEY` as the comparisons used to order the keys in the map.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
xref:bsl/map-0a7/size_type.adoc[size_type]
xref:bsl/map-0a7/count-08.adoc[count](LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,
                                                   LOOKUP_KEY>::value;
----

[.small]#xref:bsl/map-0a7/count-08.adoc[_» more..._]#


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