[#BloombergLP-bdlcc-StripedUnorderedContainerImpl-visitReadOnly-0b]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlcc.adoc[bdlcc]::xref:BloombergLP/bdlcc/StripedUnorderedContainerImpl.adoc[StripedUnorderedContainerImpl]::visitReadOnly
:relfileprefix: ../../../
:mrdocs:

Visit each element with `key` read‐only via the specified `visitor`.

== Synopsis

Declared in `<bdlcc_stripedunorderedcontainerimpl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
visitReadOnly(
    KEY const& key,
    xref:BloombergLP/bdlcc/StripedUnorderedContainerImpl/ReadOnlyVisitorFunction.adoc[ReadOnlyVisitorFunction] const& visitor) const;
----

== Description

Serially call the specified `visitor` on each element (if one exists) in this hash map having the specified `key` until every such element has been visited or `visitor` returns `false`. That is, for `(key, value)`, invoke: ` bool visitor(value, key); ` Return the number of elements visited or the negation of that value if visitations stopped because `visitor` returned `false`. `visitor` has read‐only access to each element for duration of each invocation. The behavior is undefined if hash map manipulators are invoked from within `visitor`, as it may lead to a deadlock.

== Return Value

number of elements visited, or its negation if stopped early

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key of the elements to visit
| *visitor*
| functor invoked with each matching value
|===


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