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>
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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