Return an optional containing a value constructed from the arguments.
Declared in <bslstl_optional.h>
template<class t_TYPE>
bsl::optional<bsl::decay<t_TYPE>::type>
make_optional(
std::allocator_arg_t allocatorArg,
bsl::optional<bsl::decay<t_TYPE>::type>::allocator_type const& alloc,
t_TYPE&& rhs);Return an optional object containing a t_TYPE object created by invoking a bsl::optional allocator-extended in_place_t constructor with the specified alloc as the allocator argument, and specified rhs as the constructor argument. Note that this function will fail to compile if t_TYPE doesn't use allocators.
optional containing a t_TYPE constructed from rhs
| Name | Description |
|---|---|
| allocatorArg | tag selecting the allocator-extended constructor |
| alloc | allocator used to supply memory for the optional |
| rhs | right-hand operand |