[#BloombergLP-bslstl-StopCallback_CallbackStorage-06]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::StopCallback_CallbackStorage
:relfileprefix: ../../
:mrdocs:

The primary class template stores an object of non‐reference type given by the template parameter `t_CALLBACK`. (That is, the primary template provides the implementation only when `t_IS_REFERENCE` is `false`.)

== Synopsis

Declared in `<bslstl_stoptoken.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_CALLBACK,
    bool t_IS_REFERENCE = bsl::is_reference<t_CALLBACK>::value>
class StopCallback_CallbackStorage;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/StopCallback_CallbackStorage-06/allocator_type.adoc[`allocator_type`] 
| Allocator type used when `t_CALLBACK` is allocator‐aware; otherwise an empty dummy type.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/StopCallback_CallbackStorage-06/2constructor-04.adoc[`StopCallback_CallbackStorage`]         [.small]#[constructor]#
| Constructors
| xref:BloombergLP/bslstl/StopCallback_CallbackStorage-06/2destructor.adoc[`~StopCallback_CallbackStorage`] [.small]#[destructor]#
| Destroy this object.
| xref:BloombergLP/bslstl/StopCallback_CallbackStorage-06/callback-00a.adoc[`callback`] 
| `callback` overloads
|===


== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/StopCallback_CallbackStorage-05.adoc[`StopCallback_CallbackStorage<t_CALLBACK, true>`] 
| This partial specialization stores a reference to a callback.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/StopCallback_Node.adoc[`StopCallback_Node`] 
| This component‐private class is used to implement `bsl::stop_callback`. It overrides the virtual `invoke` method of `bslstl::StopStateCallbackNode`, which allows it to be registered and invoked by `bslstl::StopState`.
|===


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