Create an optional object having the value of the (template parameter) t_TYPE created in place using the specified args. Use the specified allocator to supply memory.

Synopsis

Declared in <bslstl_optional.h>

template<class... t_ARGS>
explicit
optional(
    std::allocator_arg_t,
    AllocType allocator,
    std::in_place_t,
    t_ARGS&&... args);

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