[#BloombergLP-bslstl-operator_dec-03]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::operator&hyphen;&hyphen;
:relfileprefix: ../../
:mrdocs:

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

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    class VALUE,
    class NODE,
    class DIFFERENCE&lowbar;TYPE&gt;
xref:BloombergLP/bslstl/TreeIterator.adoc[TreeIterator&lt;VALUE, NODE, DIFFERENCE&lowbar;TYPE&gt;]
operator&hyphen;&hyphen;(
    xref:BloombergLP/bslstl/TreeIterator.adoc[TreeIterator&lt;VALUE, NODE, DIFFERENCE&lowbar;TYPE&gt;]& iter,
    int postfix);
----

== Description

Move the specified `iter` to the previous element in the tree and return the value of `iter` prior to this call&period; The behavior is undefined unless the iterator refers to the past&hyphen;the&hyphen;end or the non&hyphen;leftmost element in the tree&period;

== Return Value

previous value of `iter` before the decrement

== Parameters

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


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