[#BloombergLP-bslstl-Optional_Base-08-2constructor-04f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Optional_Base-08.adoc[Optional_Base<t_TYPE, false>]::Optional_Base
:relfileprefix: ../../../
:mrdocs:

These allocator‐extended constructors cannot be called, and are provided only to prevent compilation errors when 'optional' is explicitly instantiated.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
Optional_Base(
    std::allocator_arg_t,
    xref:BloombergLP/bslstl/Optional_Base-08/AllocType.adoc[AllocType]);
----


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