[#BloombergLP-bslstl-Optional_Base-08]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Optional_Base-05.adoc[Optional_Base]<t_TYPE, false>
:relfileprefix: ../../
:mrdocs:

Specialization of `Optional_Base` for `value_type` that is not allocator‐aware when `std::optional` is available.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
class xref:BloombergLP/bslstl/Optional_Base-05.adoc[Optional_Base]<t_TYPE, false>
    : public std::optional<t_TYPE>
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `std::optional<t_TYPE>`
| Class template for optional values.
|===

== Member Functions

[cols="1"]
|===
| Name
| xref:BloombergLP/bslstl/Optional_Base-08/2conversion-0a.adoc[`operator BloombergLP::bslmf::NestedTraitDeclaration<Optional_Base, IsBitwiseCopyable, BloombergLP::bslmf::IsBitwiseCopyable<t_TYPE>::value>`] 
| xref:BloombergLP/bslstl/Optional_Base-08/2conversion-01.adoc[`operator BloombergLP::bslmf::NestedTraitDeclaration<Optional_Base, IsBitwiseMoveable, BloombergLP::bslmf::IsBitwiseMoveable<t_TYPE>::value>`] 
|===


== Protected Types

[cols="1"]
|===
| Name
| xref:BloombergLP/bslstl/Optional_Base-08/AllocType.adoc[`AllocType`] 
|===


== Protected Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Optional_Base-08/2constructor-01.adoc[`Optional_Base`]         [.small]#[constructor]#
| Constructors
| xref:BloombergLP/bslstl/Optional_Base-08/assignOrEmplace.adoc[`assignOrEmplace`] 
| If `*this` holds an object, assign to that object the value of the specified `rhs`, converted to `t_TYPE`. Otherwise, construct a held object from `rhs`, converted to `t_TYPE`.
| xref:BloombergLP/bslstl/Optional_Base-08/dereferenceRaw-0c.adoc[`dereferenceRaw`] 
| `dereferenceRaw` overloads
|===



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