[#BloombergLP-bslma-AllocatorUtil_Traits-02]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslma.adoc[bslma]::AllocatorUtil_Traits
:relfileprefix: ../../
:mrdocs:

Extend the notion of `allocator_traits` to apply to both standard allocator and to pointer‐to‐memory‐resource types. If the (template parameter) `t_ALLOCATOR` is a non‐pointer type (i.e., an allocator class), then inherits from `bsl::allocator_traits<t_ALLOCATOR>::rebind_traits<t_TYPE>`. However, if `t_ALLOCATOR` is a pointer type, then inherits from `bsl::allocator_traits<bsl::allocator<t_TYPE>>` for pointers to classes derived from `bslma::Allocator` and from `bsl::allocator_traits<bsl::polymorphic_allocator<t_TYPE>>` for pointers to other classes derived from `bsl::memory_resource`. This primary template is for non‐pointer `t_ALLOCATOR` template arguments.

== Synopsis

Declared in `<bslma_allocatorutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_ALLOCATOR,
    class t_TYPE = char>
struct AllocatorUtil_Traits
    : bsl::allocator_traits<t_ALLOCATOR>::rebind_traits<t_TYPE>
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `bsl::allocator_traits<t_ALLOCATOR>::rebind_traits<t_TYPE>`
| 
|===

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/AllocatorUtil_Traits-0f.adoc[`AllocatorUtil_Traits<t_MEMORY_RSRC*, t_TYPE>`] 
| This specialization is for allocators expressed as a pointer to class derived from `bsl::memory_resource`. The base class will be `bsl::allocator_traits<bsl::allocator<t_TYPE>>` if `t_MEMORY_RSRC` is derived from `bsl::Allocator`; otherwise the base class will be `bsl::allocator_traits<bsl::polymorphic_allocator<t_TYPE>>`.
|===



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