[#bsl-List_AllocAndSizeWrapper]
= xref:bsl.adoc[bsl]::List_AllocAndSizeWrapper
:relfileprefix: ../
:mrdocs:

This struct is a wrapper around the allocator and size data members of a `list`. It takes advantage of the empty‐base optimization (EBO) so that if the allocator is stateless, it takes up no space.

== Synopsis

Declared in `<bslstl_list.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class VALUE,
    class ALLOCATOR>
class List_AllocAndSizeWrapper
    : public allocator_traits<ALLOCATOR>::rebind_traits<List_Node<VALUE>>::allocator_type
----

== Description

TBD: This struct should eventually be replaced by the use of a general EBO‐enabled component that provides a `pair`‐like interface. (A properly‐optimized `tuple` would do the job.)

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `allocator_traits<ALLOCATOR>::rebind_traits<List_Node<VALUE>>::allocator_type`
| 
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/List_AllocAndSizeWrapper/2constructor.adoc[`List_AllocAndSizeWrapper`]         [.small]#[constructor]#
| Create an allocator and size wrapper having the specified `basicAllocator` and (initial) `size`.
| xref:bsl/List_AllocAndSizeWrapper/size-0a.adoc[`size`] 
| Return a reference providing modifiable access to the `size` field of this object.
| xref:bsl/List_AllocAndSizeWrapper/size-08.adoc[`size`] 
| Return a reference providing non‐modifiable access to the `size` field of this object.
|===



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