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

Decrement `iterator` and return a copy of its previous value.

== Synopsis

Declared in `<bdlb_transformiterator.h>`

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

== Description

Decrement the underlying iterator of the specified `iterator`, and return a copy of `iterator` _before_ the decrement. The behavior is undefined if decrementing the underlying iterator is undefined.

== Return Value

a copy of `iterator` before the decrement

== Parameters

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


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