Return the number of elements equivalent to key.
Declared in <bslstl_unorderedset.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 within this unordered set that are equivalent to the specified key. The behavior is undefined unless key is equivalent to at most one element in this unordered set. Note that since an unordered set maintains unique keys, the returned value will be either 0 or 1.
Note: implemented inline due to Sun CC compilation error.
0 or 1
| Name | Description |
|---|---|
| key | key value to look up |