[#BloombergLP-bslalg-DequeIterator-0d-valuePtrDecrement]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/DequeIterator-0d.adoc[DequeIterator]::valuePtrDecrement
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:mrdocs:

Decrement this iterator to point to the next element in the block of the corresponding deque&period; The behavior is undefined unless this iterator is pointed to a valid position of the deque&period; Note that this method is used only for optimization purposes in `bslstl&lowbar;Deque`, and clients of this package should not use this directly&period;

== Synopsis

Declared in `&lt;bslalg&lowbar;dequeiterator&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
valuePtrDecrement();
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