[#bsl-optional-072-2constructor-09e]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional]::optional
:relfileprefix: ../../
:mrdocs:

Explicitly create an `optional` from the specified `original` using the specified `allocator`.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_ANY_TYPE>
explicit
optional(
    std::allocator_arg_t,
    xref:bsl/optional-072.adoc[AllocType] allocator,
    xref:bsl/optional-072.adoc[optional<t_ANY_TYPE>] const& original);
----


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