Call the specified visitor on element (if one exists) in this hash map having the specified key. That is, for (key, value), invoke: ` bool visitor(value, key); ` Return the number of elements visited or -1 if 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.
Declared in <bdlcc_stripedunorderedmap.h>
int
visitReadOnly(
KEY const& key,
ReadOnlyVisitorFunction const& visitor) const;