Create an optional object having the value of the (template parameter) t_TYPE created in place using the specified args.
Declared in <bslstl_optional.h>
template<class... t_ARGS>
explicit
optional(
std::allocator_arg_t allocatorArg,
AllocType allocator,
std::in_place_t inPlace,
t_ARGS&&... args);Create an optional object having the value of the (template parameter) t_TYPE created in place using the specified args. Use the specified allocator to supply memory.
| Name | Description |
|---|---|
| allocatorArg | tag selecting the allocator-extended constructor |
| allocator | allocator used to supply memory |
| inPlace | tag selecting in-place construction of the contained value |
| args | arguments forwarded to construct the contained value |