Return the number of elements equivalent to key.

Synopsis

Declared in <bslstl_set.h>

template<class LOOKUP_KEY>
size_type
count(LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,
                                                   LOOKUP_KEY>::value;

Description

Note that although a set maintains unique keys, the returned value can be other than 0 or 1, because a transparent comparator may have been supplied that provides a different (but compatible) partitioning of keys for LOOKUP_KEY as the comparisons used to order the keys in the set.

Note: implemented inline due to Sun CC compilation error.

Return Value

number of elements equivalent to key

Parameters

Name

Description

key

key value to look up

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