[#bsl-set-0d-count-03]
= xref:bsl.adoc[bsl]::xref:bsl/set-0d.adoc[set]::count
:relfileprefix: ../../
:mrdocs:

Return the number of `value_type` objects within this set that are equivalent to the specified `key`. Note that although a set 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 set.

== Synopsis

Declared in `<bslstl_set.h>`

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

== Description

Note: implemented inline due to Sun CC compilation error.


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