[#BloombergLP-bslstl-Optional_Base-05-2constructor-087]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Optional_Base-05.adoc[Optional_Base]::Optional_Base
:relfileprefix: ../../../
:mrdocs:

Create an `Optional_Base` 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.

== Synopsis

Declared in `<bslstl_optional.h>`

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


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