Return the number of elements equivalent to key.
Synopsis
Declared in <bslstl_unorderedmultiset.h>
template<class LOOKUP_KEY>
size_type
count(LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
&& BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;Description
Return the number of value_type objects within this unordered multiset that are equivalent to the specified key. The behavior is undefined unless key is equivalent to the elements of at most one equivalent‐key group in this unordered multiset.
Return Value
number of elements equivalent to key
Parameters
Name |
Description |
key |
key value to count |
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