[#BloombergLP-bslstl-Optional_Base-05-2constructor-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Optional_Base-05.adoc[Optional_Base]::Optional_Base
:relfileprefix: ../../../
:mrdocs:

Create an optional from `original` using `allocator`.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_ANY_TYPE>
Optional_Base(
    std::allocator_arg_t allocatorArg,
    xref:BloombergLP/bslstl/Optional_Base-05/allocator_type.adoc[allocator_type] allocator,
    xref:BloombergLP/bslstl/Optional_CopyConstructFromStdOptional.adoc[BloombergLP::bslstl::Optional_CopyConstructFromStdOptional] tag,
    std::optional<t_ANY_TYPE> const& original);
----

== Description

Otherwise, create a disengaged `Optional_Base` object. Use the specified `allocator` to supply memory.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *allocator*
| allocator used to supply memory
| *original*
| source value used to initialize the optional
| *allocatorArg*
| tag selecting the allocator‐extended constructor
| *tag*
| tag selecting this constructor overload
|===


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