[#memusage-stl_shared_counter]
= xref:memusage.adoc[memusage]::stl_shared_counter
:relfileprefix: ../
:mrdocs:

Layout model of the control block shared by shared_ptr/weak_ptr, used for sizing.

== Synopsis

Declared in `<memusage.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct stl_shared_counter;
----

== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:memusage/stl_shared_counter/class_type.adoc[`class_type`] 
| Pointer to the type/vtable information of the control block.
| xref:memusage/stl_shared_counter/use_count.adoc[`use_count`] 
| Number of shared_ptr references.
| xref:memusage/stl_shared_counter/weak_count.adoc[`weak_count`] 
| Number of weak_ptr references.
|===



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