[#bsl-allocator-08e-const_reference]
= xref:bsl.adoc[bsl]::xref:bsl/allocator-08e.adoc[allocator<unsigned long>]::const_reference
:relfileprefix: ../../
:mrdocs:

This `typedef` is an alias to a constant `value_type` reference.

== Synopsis

Declared in `<bslma_bslallocator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:bsl/allocator-08e/value_type.adoc[value_type] const& const_reference;
----


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