[#bsl-optional-072-2constructor-0e]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional]::optional
:relfileprefix: ../../
:mrdocs:

Create a disengaged `optional` object. Use the specified `allocator` to supply memory.

== Synopsis

Declared in `<bslstl_optional.h>`

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


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