[#BloombergLP-bslalg-DequePrimitives_ExternalDequeElementGuard]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::DequePrimitives_ExternalDequeElementGuard
:relfileprefix: ../../
:mrdocs:

Proctor that destroys an externally updated deque element range.

== Synopsis

Declared in `<bslalg_dequeprimitives.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class VALUE_TYPE,
    int BLOCK_LENGTH,
    class ALLOCATOR>
class DequePrimitives_ExternalDequeElementGuard;
----

== Description

This `class` provides a specialized proctor object that, upon destruction and unless the `release` method has been called, destroys the elements in a segment of a `bsl::deque` of parameterized type `VALUE_TYPE`. The elements destroyed are delimited by the "guarded" range `[*d_begin .. *d_end)]`. Note that the range guarded by this `class` is dynamic and can be changed outside of this `class`.

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslalg/DequePrimitives_ExternalDequeElementGuard/Iterator.adoc[`Iterator`] 
| Iterator type over elements in the guarded deque segment.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslalg/DequePrimitives_ExternalDequeElementGuard/2constructor.adoc[`DequePrimitives_ExternalDequeElementGuard`]         [.small]#[constructor]#
| Create a guard for the specified external deque element range.
| xref:BloombergLP/bslalg/DequePrimitives_ExternalDequeElementGuard/2destructor.adoc[`~DequePrimitives_ExternalDequeElementGuard`] [.small]#[destructor]#
| Destroy the guarded elements and this guard.
| xref:BloombergLP/bslalg/DequePrimitives_ExternalDequeElementGuard/release.adoc[`release`] 
| Set the range of elements guarded by this object to be empty. Note that `d_begin_p == d_end_p == 0` following this operation.
|===



[.small]#Created with https://www.mrdocs.com[MrDocs]#