Return an optional containing a value constructed from the arguments.
Declared in <bslstl_optional.h>
template<
class t_TYPE,
class... t_ARGS>
bsl::optional<t_TYPE>
make_optional(
std::allocator_arg_t allocatorArg,
bsl::optional<t_TYPE>::allocator_type const& alloc,
t_ARGS&&... args);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 args as constructor arguments. Note that this function will fail to compile if t_TYPE doesn't use allocators.
optional containing a t_TYPE constructed from args
| Name | Description |
|---|---|
| allocatorArg | tag selecting the allocator-extended constructor |
| alloc | allocator used to supply memory for the optional |
| args | arguments forwarded to construct the contained value |