bsl::optional::optional

Create a disengaged optional object if the specified original object is disengaged, and an optional object with the value of original.value() moved and converted to t_TYPE otherwise. Use the specified allocator to supply memory. original is left in a valid but unspecified state. Note that this constructor participates in overload resolution only when t_TYPE is constructible from an xvalue of t_ANY_TYPE, and is implicit only when an xvalue of t_ANY_TYPE is implicitly convertible to t_TYPE.

Synopsis

Declared in <bslstl_optional.h>

template<class t_ANY_TYPE>
optional(
    std::allocator_arg_t,
    AllocType allocator,
    std::optional<t_ANY_TYPE>&& original);

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