[#BloombergLP-bdlt-operator_dec-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlt.adoc[bdlt]::operator‐‐
:relfileprefix: ../../
:mrdocs:

Regress `iterator` and return a copy of its prior value.

== Synopsis

Declared in `<bdlt_calendarreverseiteratoradapter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class ITERATOR>
xref:BloombergLP/bdlt/CalendarReverseIteratorAdapter.adoc[bdlt::CalendarReverseIteratorAdapter<ITERATOR>]
operator‐‐(
    xref:BloombergLP/bdlt/CalendarReverseIteratorAdapter.adoc[CalendarReverseIteratorAdapter<ITERATOR>]& iterator,
    int unused);
----

== Description

Modify the specified `iterator` to refer to the previous element in the reverse iteration sequence, and return a reverse iterator having the pre‐decrement value of `iterator`. The behavior is undefined unless, on entry, `iterator` does not have the same value as a reverse iterator to the start of the underlying sequence.

== Return Value

a reverse iterator having the pre‐decrement value of `iterator`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *iterator*
| reverse iterator to regress
| *unused*
| unused parameter distinguishing the postfix operator
|===


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