| Name | Description |
|---|---|
bad_optional_access | Exception thrown when trying to access the value of an empty optional |
in_place_t | Tag type for in-place construction |
nullopt_t | Tag type for empty optional construction |
optional | Optional Objects |
optional<T&> | A specialization of optional for references. |
| Name | Description |
|---|---|
make_optional | Make an optional |
swap | Swap |
operator== | Equality operators |
operator!= | Inequality operators |
operator< | Less-than operators |
operator<= | Less-than-or-equal operators |
operator> | Greater-than operators |
operator>= | Greater-than-or-equal operators |
operator<=> | Three-way comparison operators |
| Name | Description |
|---|---|
in_place | Tag for in-place construction |
nullopt | Tag to disengage optional objects. |
| Name | Description |
|---|---|
is_derived_from_optional | Concept for checking if derived from optional. |