[#bsl-optional-072-2constructor-03e]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional]::optional
:relfileprefix: ../../
:mrdocs:

Create an `optional` object whose contained value is initialized by forwarding from the specified `value`. Use the specified `allocator` to supply memory. Note that this constructor participates in overload resolution only when `t_TYPE` is constructible from `t_ANY_TYPE`, and is explicit only when `t_ANY_TYPE` is not implicitly convertible to `t_TYPE`.

== Synopsis

Declared in `<bslstl_optional.h>`

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


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