[#BloombergLP-bslalg-ConstructorProxy_PolymorphicAllocator]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::ConstructorProxy_PolymorphicAllocator
:relfileprefix: ../../
:mrdocs:

Wrapper around `bsl::polymorphic_allocator` that can tolerate being constructed with a null pointer.

== Synopsis

Declared in `<bslalg_constructorproxy.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE = bsl::polymorphic_allocator<>::value_type>
class ConstructorProxy_PolymorphicAllocator
    : public xref:bsl/polymorphic_allocator.adoc[bsl::polymorphic_allocator<TYPE>]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/polymorphic_allocator.adoc[bsl::polymorphic_allocator<TYPE>]`
| Alias for `std::pmr::polymorphic_allocator` in the `bsl` namespace.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslalg/ConstructorProxy_PolymorphicAllocator/2constructor-08.adoc[`ConstructorProxy_PolymorphicAllocator`]         [.small]#[constructor]#
| Construct from the address of a `memory_resource` optionally specified by `r`. If `r` is null or not specified, construct from the default allocator.
| xref:BloombergLP/bslalg/ConstructorProxy_PolymorphicAllocator/2constructor-0c.adoc[`ConstructorProxy_PolymorphicAllocator`]         [.small]#[constructor]#
| Create an allocator using the same `memory_resource` as the specified `other` allocator.
| xref:BloombergLP/bslalg/ConstructorProxy_PolymorphicAllocator/2conversion-05.adoc[`operator BloombergLP::bslmf::NestedTraitDeclaration<ConstructorProxy_PolymorphicAllocator, IsStdAllocator>`] 
| Declare that `ConstructorProxy_PolymorphicAllocator` is a standard allocator.
| xref:BloombergLP/bslalg/ConstructorProxy_PolymorphicAllocator/2conversion-03.adoc[`operator BloombergLP::bslmf::NestedTraitDeclaration<ConstructorProxy_PolymorphicAllocator, UsesBslmaAllocator, false>`] 
| Declare that `ConstructorProxy_PolymorphicAllocator` does not use a `bslma` allocator when `false` is specified.
|===



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