[#bsl-optional-072-2constructor-0a8]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional]::optional
:relfileprefix: ../../
:mrdocs:

Create an `optional` object having the value of the (template parameter) `t_TYPE` created in place using the specified `il` and specified `args`. Use the currently installed default allocator to supply memory. This constructor can be called in constant expressions only when `t_TYPE` is not allocator‐aware.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_INIT_LIST_TYPE,
    class... t_ARGS>
constexpr
explicit
optional(
    std::in_place_t,
    std::initializer_list<t_INIT_LIST_TYPE> il,
    t_ARGS&&... args);
----


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