[#BloombergLP-bslalg-DequeIterator-01-operator_minus_eq]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/DequeIterator-01.adoc[DequeIterator<VALUE_TYPE, 1>]::operator‐=
:relfileprefix: ../../../
:mrdocs:

Move this iterator backward by the specified `offset`.

== Synopsis

Declared in `<bslalg_dequeiterator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
operator‐=(std::ptrdiff_t offset);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *offset*
| number of elements to move backward (may be negative)
|===


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