Create a disengaged Optional_Base using allocator.
Declared in <bslstl_optional.h>
Optional_Base(
std::allocator_arg_t allocatorArg,
AllocType allocator,
bsl::nullopt_t nullopt);| Name | Description |
|---|---|
| allocatorArg | tag selecting the allocator-extended constructor |
| allocator | allocator used to supply memory |
| nullopt | disengaged-optional tag; value is unused |