Explicitly create an optional from the specified original using the specified allocator.
Declared in <bslstl_optional.h>
template<class t_ANY_TYPE>
explicit
optional(
std::allocator_arg_t allocatorArg,
AllocType allocator,
optional<t_ANY_TYPE> const& original);| Name | Description |
|---|---|
| allocatorArg | tag selecting the allocator-extended constructor |
| allocator | allocator used to supply memory |
| original | source optional used to initialize this object |