Return the number of elements with a key equivalent to key.
Declared in <bslstl_unorderedmultimap.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;Return the number of value_type objects in this unordered multimap with a key equivalent to the specified key. The behavior is undefined unless key is equivalent to the key of the elements of at most one equivalent-key group in this unordered multimap.
number of elements with an equivalent key
| Name | Description |
|---|---|
| key | transparent key value to count |