BloombergLP::bdlc::FlatHashMap::count

Return the number of elements with the specified key.

Synopsis

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;

Description

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.

Return Value

1 if key is present, and 0 otherwise

Parameters

Name

Description

key

transparent key to count

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