[#BloombergLP-bslalg-DequePrimitives-01-moveFront]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/DequePrimitives-01.adoc[DequePrimitives]::moveFront
:relfileprefix: ../../../
:mrdocs:

Move elements forward with `std::memmove` and update the iterators.

== Synopsis

Declared in `<bslalg_dequeprimitives.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
void
moveFront(
    xref:BloombergLP/bslalg/DequePrimitives-01/Iterator.adoc[Iterator]* destination,
    xref:BloombergLP/bslalg/DequePrimitives-01/Iterator.adoc[Iterator]* source,
    xref:BloombergLP/bslalg/DequePrimitives-01/size_type.adoc[size_type] numElements);
----

== Description

Move the specified `numElements` from the specified `source` to the specified `destination` using `std::memmove`. Also load into `destination` the value `destination + numElements` and `source` the the value `source + numElements`. The behavior is undefined unless `destination <= source`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *destination*
| destination iterator; updated to `*destination + numElements`
| *source*
| source iterator; updated to `*source + numElements`
| *numElements*
| number of elements to move
|===


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