[#BloombergLP-bslstl-operator_dec-05]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::operator&hyphen;&hyphen;
:relfileprefix: ../../
:mrdocs:

Regress `iter` to the previous element and return its previous value&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;randomaccessiterator&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    class T,
    class ITER&lowbar;IMP,
    class TAG&lowbar;TYPE&gt;
xref:BloombergLP/bslstl/RandomAccessIterator.adoc[bslstl::RandomAccessIterator&lt;T, ITER&lowbar;IMP, TAG&lowbar;TYPE&gt;]
operator&hyphen;&hyphen;(
    xref:BloombergLP/bslstl/RandomAccessIterator.adoc[RandomAccessIterator&lt;T, ITER&lowbar;IMP, TAG&lowbar;TYPE&gt;]& iter,
    int postfix);
----

== Description

Decrement the specified `iter` to previous element&period; Return the previous value of `iter`&period; The behavior is undefined if, on entry, `iter` has the same value as an iterator to the start of the underlying sequence&period;

== Return Value

previous value of `iter` before the decrement

== Parameters

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


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