bsl::unordered_map::count

Synopses

Declared in <bslstl_unorderedmap.h>

Return the number of value_type objects contained within this unordered map having the specified key. Note that since an unordered map maintains unique keys, the returned value will be either 0 or 1.

size_type
count(key_type const& key) const;

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Return the number of value_type objects within this unordered map that have a key equivalent to the specified key. The behavior is undefined unless key is equivalent to at most one key in this unordered map. Note that since an unordered map maintains unique keys, the returned value will be either 0 or 1.

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;

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