[#BloombergLP-bslalg-ConstructorProxy_PolymorphicAllocator-2constructor-08]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/ConstructorProxy_PolymorphicAllocator.adoc[ConstructorProxy_PolymorphicAllocator]::ConstructorProxy_PolymorphicAllocator
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:mrdocs:

Construct from the address of a `memory_resource` optionally specified by `r`. If `r` is null or not specified, construct from the default allocator.

== Synopsis

Declared in `<bslalg_constructorproxy.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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ConstructorProxy_PolymorphicAllocator(std::pmr::memory_resource* r = 0);
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