Add category to this registry unless it is already registered.
Add the specified category to this registry, unless it has already been registered. Return the address of the newly-created non-modifiable balm::Category object on success, and 0 otherwise. The behavior is undefined unless category is null-terminated.
address of the newly-created category, or 0 if already registered
| Name | Description |
|---|---|
| category | null-terminated category name |