[#BloombergLP-bslmf-UsesAllocatorArgT-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::UsesAllocatorArgT
:relfileprefix: ../../
:mrdocs:

Metafunction that is `true_type` if `t_TYPE` uses `allocator_arg_t` construction.

== Synopsis

Declared in `<bslmf_usesallocatorargt.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
struct UsesAllocatorArgT
    : DetectNestedTrait<t_TYPE, UsesAllocatorArgT>::type
----

== Description

User‐specialized trait type indicating that the constructor of `t_TYPE` can be invoked using `bsl::allocator_arg` as its first argument and an allocator object as its second argument.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `DetectNestedTrait<t_TYPE, UsesAllocatorArgT>::type`
| 
|===

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/UsesAllocatorArgT-047.adoc[`UsesAllocatorArgT<t_TYPE volatile>`] 
| Partial specialization that associates the same trait with `volatile t_TYPE` as with unqualified `t_TYPE`.
| xref:BloombergLP/bslmf/UsesAllocatorArgT-044.adoc[`UsesAllocatorArgT<t_TYPE const>`] 
| Partial specialization that associates the same trait with `const t_TYPE` as with unqualified `t_TYPE`.
| xref:BloombergLP/bslmf/UsesAllocatorArgT-0d.adoc[`UsesAllocatorArgT<t_TYPE const volatile>`] 
| Partial specialization that associates the same trait with `const volatile t_TYPE` as with unqualified `t_TYPE`.
|===



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