If the specified original contains a value, create an optional object whose contained value is initialized from *original; otherwise, create a.
Declared in <bslstl_optional.h>
optional(
std::allocator_arg_t allocatorArg,
AllocType allocator,
optional const& original);If the specified original contains a value, create an optional object whose contained value is initialized from *original; otherwise, create a disengaged
If the specified original contains a value, create an optional object whose contained value is initialized from *original; otherwise, create a disengaged optional object. Use the specified allocator to supply memory.
| Name | Description |
|---|---|
| allocatorArg | tag selecting the allocator-extended constructor |
| allocator | allocator used to supply memory |
| original | source optional used to initialize this object |