[#bsl-unordered_map-0bf-count-0f]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-0bf.adoc[unordered_map<basic_string<char>, Json, TransparentHash, TransparentEqualTo>]::count
:relfileprefix: ../../
:mrdocs:

Return the number of `value_type` objects within this unordered map that have a key equivalent to the specified `key`. The behavior is undefined unless `key` is equivalent to at most one key in this unordered map. Note that since an unordered map maintains unique keys, the returned value will be either 0 or 1.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

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

== Description

Note: implemented inline due to Sun CC compilation error.


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