[#BloombergLP-bslalg-HashTableImpUtil-findTransparent]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/HashTableImpUtil.adoc[HashTableImpUtil]::findTransparent
:relfileprefix: ../../../
:mrdocs:

Return the first node matching `key` with transparent equality, or null.

== Synopsis

Declared in `<bslalg_hashtableimputil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class KEY_CONFIG,
    class LOOKUP_KEY,
    class KEY_EQUAL>
static
xref:BloombergLP/bslalg/BidirectionalLink.adoc[BidirectionalLink]*
findTransparent(
    xref:BloombergLP/bslalg/HashTableAnchor.adoc[HashTableAnchor] const& anchor,
    LOOKUP_KEY const& key,
    KEY_EQUAL const& equalityFunctor,
    std::size_t hashCode);
----

== Description

Return the address of the first link in the list element of the specified `anchor` having a value matching (according to the specified transparent `equalityFunctor`) the specified `key` in the bucket that holds elements with the specified `hashCode` if such a link exists, and return 0 otherwise. The behavior is undefined unless, for the provided `KEY_CONFIG` and some hash function, `HASHER`, `anchor` is well‐formed (see `isWellFormed`) and `HASHER(key)` returns `hashCode`. `KEY_CONFIG` shall be a namespace providing the type names `KeyType` and `ValueType`, as well as a function that can be called as if it had the following signature: ` const KeyType& extractKey(const ValueType& obj); ` `KEY_EQUAL` shall be a functor that can be called as if it had the following signature: ` bool operator()(const LOOKUP_KEY& key1, const KEY_CONFIG::KeyType& key2)

`

== Return Value

address of the matching link, or 0 if none

== Parameters

[cols="1,4"]
|===
| Name| Description
| *anchor*
| hash table to search
| *key*
| lookup key compared using the transparent equality functor
| *equalityFunctor*
| transparent predicate comparing `key` to stored keys
| *hashCode*
| non‐adjusted hash code of `key`
|===


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