[#bsl-optional-072-2constructor-08f]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional]::optional
:relfileprefix: ../../
:mrdocs:

Create a disengaged `optional` object.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
optional(
    std::allocator_arg_t allocatorArg,
    xref:bsl/optional-072.adoc[AllocType] allocator,
    xref:bsl/nullopt_t.adoc[bsl::nullopt_t] nullopt);
----

== Description

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
| *nullopt*
| disengaged‐optional tag; value is unused
|===


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