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.

Synopsis

Declared in <bslstl_unorderedmap.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;

Description

Note: implemented inline due to Sun CC compilation error.

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