Create an Optional_Base object.
Declared in <bslstl_optional.h>
Optional_Base(
std::allocator_arg_t allocatorArg,
allocator_type allocator,
Optional_Base const& original);If the specified original contains a value, create an Optional_Base object whose contained value is initialized from *original. Otherwise, create a disengaged Optional_Base 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 |