[#BloombergLP-bslstl-Optional_Base-05-2constructor-088]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Optional_Base-05.adoc[Optional_Base]::Optional_Base
:relfileprefix: ../../../
:mrdocs:

Create a disengaged `Optional_Base` object. Use the specified `allocator` to supply memory.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
Optional_Base(
    std::allocator_arg_t,
    xref:BloombergLP/bslstl/Optional_Base-05/allocator_type.adoc[allocator_type] allocator);
----


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