[#BloombergLP-bdlcc-SingleConsumerQueue]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlcc.adoc[bdlcc]::SingleConsumerQueue
:relfileprefix: ../../
:mrdocs:

This class provides a thread‐safe unbounded queue of values that assumes a single consumer thread.

== Synopsis

Declared in `<bdlcc_singleconsumerqueue.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE>
class SingleConsumerQueue;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlcc/SingleConsumerQueue/value_type.adoc[`value_type`] 
| The type for elements stored in this queue.
|===


== Enums

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlcc/SingleConsumerQueue/_04enum.adoc[`Unnamed enum`] 
| Status codes returned by queue operations.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlcc/SingleConsumerQueue/2constructor-03.adoc[`SingleConsumerQueue`]         [.small]#[constructor]#
| Constructors
| xref:BloombergLP/bdlcc/SingleConsumerQueue/allocator.adoc[`allocator`] 
| Return the allocator used by this object to supply memory.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/disablePopFront.adoc[`disablePopFront`] 
| Disable dequeueing from this queue.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/disablePushBack.adoc[`disablePushBack`] 
| Disable enqueueing into this queue.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/enablePopFront.adoc[`enablePopFront`] 
| Enable dequeueing. If the queue is not dequeue disabled, this call has no effect.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/enablePushBack.adoc[`enablePushBack`] 
| Enable queuing. If the queue is not enqueue disabled, this call has no effect.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/isEmpty.adoc[`isEmpty`] 
| Return `true` if this queue is empty (has no elements), or `false` otherwise.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/isFull.adoc[`isFull`] 
| Return `true` if this queue is full (has no available capacity), or `false` otherwise. Note that for unbounded queues, this method always returns `false`.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/isPopFrontDisabled.adoc[`isPopFrontDisabled`] 
| Return `true` if this queue is dequeue disabled, and `false` otherwise. Note that the queue is created in the "dequeue enabled" state.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/isPushBackDisabled.adoc[`isPushBackDisabled`] 
| Return `true` if this queue is enqueue disabled, and `false` otherwise. Note that the queue is created in the "enqueue enabled" state.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/numElements.adoc[`numElements`] 
| Returns the number of elements currently in this queue.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/popFront.adoc[`popFront`] 
| Remove the front element and load it into `value`, blocking if empty.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/pushBack-0b2.adoc[`pushBack`] 
| `pushBack` overloads
| xref:BloombergLP/bdlcc/SingleConsumerQueue/removeAll.adoc[`removeAll`] 
| Remove all items currently in this queue.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/tryPopFront.adoc[`tryPopFront`] 
| Attempt to remove the front element without blocking.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/tryPushBack-03.adoc[`tryPushBack`] 
| `tryPushBack` overloads
| xref:BloombergLP/bdlcc/SingleConsumerQueue/waitUntilEmpty.adoc[`waitUntilEmpty`] 
| Block until all the elements in this queue are removed.
| xref:BloombergLP/bdlcc/SingleConsumerQueue/2conversion.adoc[`operator BloombergLP::bslmf::NestedTraitDeclaration<SingleConsumerQueue, UsesBslmaAllocator>`] 
| Declare that this type uses a `bslma` allocator.
|===



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