Create an Optional_Base object whose contained value is initialized from the specified il and args.
Declared in <bslstl_optional.h>
template<
class t_INIT_LIST_TYPE,
class... t_ARGS>
constexpr
Optional_Base(
std::in_place_t,
std::initializer_list<t_INIT_LIST_TYPE> il,
t_ARGS&&... args);