[#BloombergLP-bslstl-Optional_Base-05-2constructor-09f]
= 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_Base` object.

== 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_CopyConstructFromOtherOptional.adoc[BloombergLP::bslstl::Optional_CopyConstructFromOtherOptional] tag,
    xref:BloombergLP/bslstl/Optional_Base-05.adoc[Optional_Base<t_ANY_TYPE>] const& original);
----

== Description

If the specified `original` contains a value, create an `Optional_Base` object whose contained value is initialized from `*original`, converted to `t_TYPE`. Otherwise, create a disengaged `Optional_Base`. Use the specified `allocator` to supply memory.

== Parameters

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


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