Return the number of elements with the specified key.
Declared in <bdlc_flathashmap.h>
template<class LOOKUP_KEY>
std::size_t
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 elements in this map having a key equivalent to the specified key. Note that since a flat hash map maintains unique keys, the returned value will be either 0 or 1.
1 if key is present, and 0 otherwise
| Name | Description |
|---|---|
| key | transparent key to count |