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

Decrement the value pointer within the current block.

== Synopsis

Declared in `<bslalg_dequeiterator.h>`

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

== Description

The behavior is undefined unless this iterator is pointed to a valid position of the deque. Note that this method is used only for optimization purposes in `bslstl_Deque`, and clients of this package should not use this directly. For this specialization (`BLOCK_LENGTH` of 1), the behavior is always undefined.


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