Returns the class definition of a specified class.
- iOS 2.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
The name of the class to look up.
The Class object for the named class.
This function is the same as
objc_get, but kills the process if the class is not found.
This function is used by ZeroLink, where failing to find a class would be a compile-time link error without ZeroLink.