[#BloombergLP-bslstl-Optional_Base-05-2constructor-0bf2]
= 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 if the specified `original` object is disengaged, and an `Optional_Base` object with the value of `original.value()` converted to `t_TYPE` otherwise. Use the currently installed default allocator to supply memory.

== Synopsis

Declared in `<bslstl_optional.h>`

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


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