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

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`.

== Synopsis

Declared in `<bslstl_stoptoken.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_CALLBACK>
class StopCallback_Node
    : public xref:BloombergLP/bslstl/StopCallback_CallbackStorage-06.adoc[StopCallback_CallbackStorage<t_CALLBACK>]
    , public xref:BloombergLP/bslstl/StopStateCallbackNode.adoc[StopStateCallbackNode]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:BloombergLP/bslstl/StopCallback_CallbackStorage-06.adoc[StopCallback_CallbackStorage<t_CALLBACK>]`
| 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`.)
| `xref:BloombergLP/bslstl/StopStateCallbackNode.adoc[StopStateCallbackNode]`
| Intrusive list node that stores a registered stop‐callback invocation.
|===

== 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_Node/2constructor-08.adoc[`StopCallback_Node`]         [.small]#[constructor]#
| Constructors
| xref:BloombergLP/bslstl/StopCallback_CallbackStorage-06/callback-00a.adoc[`callback`] 
| `callback` overloads
| xref:BloombergLP/bslstl/StopStateCallbackNode/invoke.adoc[`invoke`]  [.small]#[virtual]#
| Invoke the callback stored in the derived class.
|===



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